R 408.10199
R 408.10199 Tables.
Cite as Mich. Admin. Code R 408.10199
Rule 199. Tables 1 to 31 read as follows:
TABLES 1 TO 31
TABLE 1
GUARD EXPOSURE ANGLE
Grinder Type
Exposure Above or Below
Horizontal Plane
Total Exposure
Bench and Floor
65 degrees above
*90 degrees
Cylindrical Grinder
65 degrees above
180 degrees
Surface Grinder
15 degrees below
150 degrees
Cut-off Machine
15 degrees below
150 degrees
Swing Frame
180 degrees
Snagging
180 degrees
Top
30 degrees above
60 degrees
Portable
180 degrees
Masonry and Concrete Saws
35 degrees above
180 degrees
Tool and Cutter Grinder
180 degrees
*Whenever the nature of the work requires contact with the abrasive wheel below the horizontal plane of
the spindle, the exposure shall not exceed 125 degrees.
TABLE 2
GUIDE FOR CONSTRUCTION OF DRAWN STEEL GUARDS FOR WHEEL
2” THICK AND LESS, 8” AND LESS IN DIAMETER
*Material Used in
Construction of Guard
Hot Rolled Steel SAE
1008 Min. Tensile
Strength 60,000 PSI for
speeds up to (SFPM)
Maximum
Thickness of
Wheel,
Inches
2 to 5 inches
Above 5 to 8 inches
A
Inches
B
Inches
A
Inches
B
Inches
9,500
2
1/16
1/16
3/32
1/16
12,500
2
3/32
1/16
3/32
3/32
17,000
1
3/32
1/16
1/8
3/32
*The recommendations listed in the above table are guides for the conditions stated. Other material,
designs or dimensions affording equal or superior protection are also acceptable.
TABLE 3
DRAWN STEEL GUARD FOR PORTABLE GRINDERS
USED WITH DEPRESSED CENTER WHEELS
Material Used in Construction
of Guard
Thickness of
Wheel
Wheel
Diameter
Inches
A
Inches
B
Inches
For speeds up
to 14,200
SFPM
*Hot Rolled
Steel SAE
1008 min.
tensile strength
60,000 PSI
3/8 inches or
less
2 to 9
1/16
1/2
Over 3/8 to 1
inch
7 to 9
3/32
1 1/8
*The recommendations listed in the above table are guides for the conditions stated. Other material,
designs or dimensions affording equal or superior protection are also acceptable.
TABLE 4
TABLE FOR FABRICATED STEEL GUARDS FOR SQUARED OR TAPERED CUP WHEELS
Wheel Diameter*
Back Thickness
*Band Thickness
Bolts Connecting
Band to Back
Member
4”
.056 – .064
.112 – .128
3 5/16 – 18
5”
.082 – .098
.112 – .128
3 5/16 – 18
6”
.082 – .098
.112 – .128
3 3/8 – 16
TABLE 5
TABLE FOR DRAWN STEEL GUARDS FOR TAPERED CUP WHEELS
Wheel
Diameter
“A”
No.
Bolts to
Machine
No.
Bolts
Connecting
Hood to Band
Washer
Back Plate
Thickness
“B”
O.D.
*“C”
Hood
*”D”
Band
4”
1 7/8
4
1/4 – 20
3
5/16 – 18 x 3/4
.097 – .112
4
.056 – .064
.112 – .128
5”
2 1/8
4
5/16 – 18
3
5/16 – 18 x 3/4
.097 – .112
4 3/4
.082 – .098
.112 – .128
6”
2 5/8
4
5/16 – 18
4
5/16 – 18 x 3/4
.097 – .112
4 3/4
.082 – .098
.112 – .128
*The recommendations listed in the above tables are guides for the conditions stated.
Other material, designs or dimensions affording equal or superior protection are also acceptable.
TABLE 6
MINIMUM BASIC THICKNESSES OF PERIPHERAL AND SIDE MEMBERS FOR SAFETY GUARDS
Material Used
in Construction
of Guard
Maximum
Thickness
of Grinding
Wheel
GRINDING WHEEL DIAMETERS
3 to 6 inches
Over 6 to 12
inches
Over 12 to 16
inches
Over 16 to 20
inches
Over 20 to 24
inches
Over 24 to 30
inches
Over 30 to 48
inches
A
B
A
B
A
B
A
B
A
B
A
B
A
B
Inches
Inches
Inches
Inches
Inches
Inches
Inches
Inches
Material Satisfactory*
for speeds up to
8,000 SFPM
Cast Iron (Min.
Tensile Strength
20,000 PSI)
Class 20
2
1/4
1/4
3/8
5/16
1/2
3/8
5/8
1/2
7/8
5/8
1
3/4
1 1/4
1
4
5/16
5/16
3/8
5/16
1/2
3/8
3/4
5/8
1
5/8
1 1/8
3/4
1 3/8
1
6
3/8
5/16
1/2
7/16
5/8
1/2
1
5/8
1 1/8
3/4
1 1/4
7/8
1 1/2
1 1/8
8
5/8
9/16
7/8
3/4
1
3/4
1 1/8
3/4
1 1/4
7/8
1 1/2
1 1/8
10
3/4
11/16
7/8
3/4
1
3/4
1 1/8
3/4
1 1/4
7/8
1 1/2
1 1/8
16
1 1/8
1
1 1/4
1
1 5/16
1
1 7/16
1 1/16
1 3/4
1 3/8
20
1 3/8
1 1/8
1 3/8
1 1/8
1 1/2
1 3/8
2
1 5/8
Material Satisfactory
* for speeds up to
9,000 SFPM
Malleable Iron
(Min. Tensile Strength
50,000 PSI) Grade
32510
2
1/4
1/4
3/8
5/16
1/2
3/8
5/8
1/2
3/4
5/8
7/8
3/4
1
7/8
4
5/16
5/16
3/8
5/16
1/2
3/8
5/8
1/2
3/4
5/8
7/8
3/4
1 1/8
7/8
6
3/8
5/16
1/2
7/16
5/8
1/2
3/4
5/8
7/8
5/8
1
3/4
1 1/4
7/8
8
1/2
7/16
5/8
1/2
3/4
5/8
7/8
5/8
1
3/4
1 1/4
7/8
10
1/2
7/16
5/8
1/2
3/4
5/8
7/8
5/8
1
3/4
1 1/4
7/8
16
13/16
11/16
13/16
11/16
1
3/4
1 1/8
7/8
1 3/8
1
20
7/8
3/4
1
3/4
1 1/8
7/8
1 1/2
1 1/8
Material Satisfactory* for speeds up
to 16,000 SFPM
Steel Castings
(Min. Tensile Strength
60,000 PSI) Grade
V60-30
2
1/4
1/4
5/16
5/16
3/8
3/8
1/2
7/16
5/8
1/2
3/4
5/8
7/8
3/4
4
1/4
1/4
1/2
1/2
1/2
1/2
9/16
1/2
5/8
1/2
3/4
5/8
1
3/4
6
3/8
1/4
3/4
5/8
3/4
5/8
3/4
5/8
13/16
11/16
13/16
11/16
1 1/8
3/4
8
7/8
3/4
7/8
3/4
7/8
3/4
7/8
3/4
15/16
13/16
1 3/8
1
10
1
7/8
1
7/8
1
7/8
1 1/8
15/16
1 1/8
1
1 7/16
1 1/16
16
1 1/4
1 1/8
1 1/4
1 1/8
1 1/4
1 1/8
1 1/4
1 1/8
1 13/16
1 7/16
20
1 3/8
1 1/4
1 3/8
1 1/4
1 7/16
1 5/16
2 1/16
1 11/16
Structural Steel (Min.
Tensile 60,000 PSI)
2
1/8
1/16
5/16
1/4
5/16
1/4
5/16
1/4
5/16
1/4
3/8
5/16
1/2
3/8
4
1/8
1/16
3/8
5/16
3/8
5/16
3/8
5/16
3/8
5/16
3/8
5/16
1/2
3/8
6
3/16
1/16
1/2
3/8
7/16
3/8
7/16
3/8
7/16
3/8
7/16
3/8
3/4
1/2
8
1/2
3/8
9/16
7/16
9/16
7/16
9/16
7/16
5/8
1/2
3/4
1/2
10
9/16
7/16
5/8
1/2
5/8
1/2
5/8
1/2
5/8
1/2
7/8
5/8
16
5/8
9/16
3/4
5/8
3/4
5/8
13/16
11/16
1 1/16
13/16
20
13/16
11/16
13/16
11/16
7/8
3/4
1 3/16
15/16
*The recommendations listed in the above table are guides for the conditions stated.
Other material, designs or dimensions affording equal or superior protections are also acceptable.
TABLE 7
MINIMUM BASIC THICKNESS FOR PERIPHERAL AND SIDE
MEMBERS FOR SAFETY GUARDS USED WITH CUTTING-OFF WHEELS
Material Used
in
Construction
of Guard
Maximum
Thickness
of Cutting
Off Wheel
Speed
Not to
Exceed
Cutting Off Wheel Diameters
6 to 11
inches
Over 11 to
20 inches
Over 20
to 30
inches
Over 30 to
48 inches
Over 48
to 72
inches
A
B
A
B
A
B
A
B
A
B
*Structural
Steel
(Min. Tensile
Strength
60,000 PSI)
1/2 inch or
less
14,200
SFPM
1/16
1/16
3/32
3/32
1/8
1/8
3/16
3/16
1/4
1/4
1/2 inch or
less
16,000
SFPM
3/32
1/8
1/8
1/8
3/16
1/8
1/4
3/16
5/16
1/4
*The recommendations listed in the above table are guides for the conditions stated.
Other material, designs or dimensions affording equal or superior protection are also acceptable.
TABLE 8
DIMENSIONAL REQUIREMENTS FOR CONSTRUCTION OF FABRICATED GUARDS
MAXIMUM WHEEL SPEED 10,000 SFPM
A
B
C
D
E
F
G
H
Diameter of
Wheel
Length of
Tongue
Diameter of Bolts
Medium Carbon
Quenched &
Tempered
Size of Angle
Supports Tongue
and Rest
Diameter of
Rivets for
Supports
Diameter of End
Connecting Bolts
Thickness of
Tongue
Maximum Space
Between New
Wheel
and Guard
at Periphery
Maximum Inside
Width
of Guard
Inches
Inches
Inches
Inches
Inches
Inches
Inches
Inches
Inches
Under 12
3 1/2
9/16
1 1/2 x 1 1/2
x 5/16
4 ea. @
1/2
1/2
1/4
1 1/2
1 1/2
wider than
wheel
16
5
5/8
2 x 2 x 5/16
4 ea. @
5/8
9/16
5/16
1 1/2
2 wider
than wheel
24
6
3/4
2 x 2 x 1/2
6 ea. @
5/8
5/8
1/2
1 1/2
2 wider
than wheel
30
7
11/16
2 1/2 x 2 1/2
x 1/2
6 ea. @
11/16
11/16
1/2
1 1/2
2 wider
than wheel
NOTE: Column D assumes low carbon steel (38,000 PSI tensile) rivets. Two rivets per bar 12 and 16” diameter. For rivets
per bar 24 and 30” diameter.
TABLE 9
GUIDE FOR CONSTRUCTION OF BAND TYPE GUARDS
Maximum Wheel Speed 7000 SFPM For Ring, Segment, Nut Inserted Wheels
Maximum
Material
Specifications
Diameter of
Wheel
Minimum
Thickness of
Band A
Minimum
Diameter of
Rivets
Maximum
Distance Between
Centers of Rivets
Inches
Inches
Inches
Inches
*Hot Rolled Steel
SAE 1008
Under 8
1/16
3/16
3/4
8 to 24
1/8
1/4
1
Over 24 to 30
1/4
3/8
1 1/4
* The recommendations listed in the above table are guides for the conditions stated. Other material,
designs or dimensions affording equal or superior protection are also acceptable.
TABLE 10
GUIDE FOR CONSTRUCTION OF BAND TYPE GUARDS
EXPOSURE VERSUS WHEEL THICKNESS
Overall Thickness of Wheel (T) Inches
Maximum Exposure of Wheel (C) Inches
1/2
1/4
1
1/2
2
3/4
3
1
4
1 1/2
5 and over
2
TABLE 11
MINIMUM DIMENSIONS FOR STRAIGHT RELIEVED FLANGES
A*
B
C
D
E
Diameter of
Wheel
**Minimum
Outside
Diameter of
Flanges
Radial Width of Bearing
Surface
Minimum
Thickness of
Flange at
Bore
Minimum
Thickness of
Flange at
Edge of
Recess
Minimum
Maximum
Inches
Inches
Inches
Inches
Inches
Inches
1
3/8
1/16
1/8
1/16
1/16
2
3/4
1/8
3/16
1/8
3/32
3
1
1/8
3/16
3/16
3/32
4
1 3/8
1/8
3/16
3/16
1/8
5
1 3/4
3/16
1/4
1/4
1/8
6
2
1/4
1/2
3/8
3/16
7
2 1/2
1/4
1/2
3/8
3/16
8
3
1/4
1/2
3/8
3/16
10
3 1/2
5/16
5/8
3/8
1/4
12
4
5/16
5/8
1/2
5/16
14
4 1/2
3/8
3/4
1/2
5/16
16
5 1/2
1/2
1
1/2
5/16
18
6
1/2
1
5/8
3/8
20
7
5/8
1 1/4
5/8
3/8
22
7 1/2
5/8
1 1/4
5/8
7/16
24
8
3/4
1 1/4
5/8
7/16
26
8 1/2
3/4
1 1/4
5/8
1/2
28
10
7/8
1 1/2
3/4
1/2
30
10
7/8
1 1/2
3/4
5/8
36
12
1
2
7/8
3/4
42
14
1
2
7/8
3/4
48
16
1 1/4
2
1 1/8
1
60
20
1 1/4
2
1 1/4
1 1/8
72
24
1 1/2
2 1/2
1 3/8
1 1/4
* Flanges for wheels under 2 inches diameter may be unrelieved and shall be maintained flat and true.
** See rule 141.
TABLE 12
MINIMUM DIMENSIONS FOR STRAIGHT UNRELIEVED FLANGES
FOR WHEELS WITH THREADED INSERTS OR PROJECTING STUDS
A
B*
T
Diameter of Wheel
Minimum Outside
Diameter of Flange
Minimum Thickness
of Flange
Inches
Inches
Inches
1
5/8
1/8
2
1
1/8
3
1
3/16
4
1 3/8
3/16
5
1 3/4
1/4
6
2
3/8
* NOTE:
Must be large enough to extend beyond the bushing. Where prong anchor or cupback
bushing are used, this footnote does not apply.
TABLE 13
MINIMUM DIMENSIONS FOR STRAIGHT ADAPTOR FLANGE
FOR ORGANIC BONDED WHEELS OVER 1 1/4 INCH THICK
B
D
E
F*
Wheel
Diameter
Wheel Hole
Diameter
Minimum
Flange
Diameter
Minimum
Thickness
of Flange
at Bore
Minimum
Thickness
of Flange
at Edge of
Undercut
(D-E)
Minimum
Thickness
Inches
Inches
Inches
Inches
Inches
Inches
12 to 14
4
6
7/8
3/8
1/2
5
7
7/8
3/8
1/2
6
8
7/8
3/8
1/2
Larger than
14 to 18
4
6
7/8
3/8
1/2
5
7
7/8
3/8
1/2
6
8
7/8
3/8
1/2
7
9
7/8
3/8
1/2
8
10
7/8
3/8
1/2
Larger than
18 to 24
6
8
1
1/2
1/2
7
9
1
1/2
1/2
8
10
1
1/2
1/2
10
12
1
1/2
1/2
12
14
1
1/2
1/2
Larger than 24
to 30
12
15
1
1/2
1/2
Larger than 30
to 36
12
15
1 3/8
7/8
1/2
* For wheels under 1 1/4 inch thick F dimension shall not exceed 40% of wheel thickness.
TABLE 14
MINIMUM DIMENSIONS FOR STRAIGHT FLANGES
FOR AUTOMATIC SNAG MACHINES 12,500 S.F.P.M. TO 16,500 S.F.P.M.1
B
D
E
F*
Wheel
Diameter
Wheel Hole
Diameter
Minimum
Flange
Diameter
Minimum
Thickness of
Flange at
Bore
Minimum
Thickness of
Flange at Edge
of Undercut
(D-E)
Minimum
Thickness
20
6
8
1
1/2
1/2
20
8
10
1 1/2
3/4
3/4
24
12
15
1 1/2
3/4
3/4
30
12
15
1 1/2
3/4
3/4
36
12
15
1 1/2
3/4
3/4
1 FLANGES shall be of steel, quality SAE 1040 or equivalent, annealed plate, heat treated to R c 25-
30.
* For wheels under 1 1/4 inch thick F dimension shall not exceed 40% of wheel thickness.
TABLE 15
MINIMUM DIMENSIONS FOR STRAIGHT ADAPTOR FLANGE
FOR ORGANIC BONDED WHEELS USED ON SWING FRAME GRINDERS
AT 12,500 S.F.P.M. TO 16,500 S.F.P.M.1
B
D
E
F*
Wheel
Diameter
Wheel Hole
Diameter
Minimum
Flange
Diameter
Minimum
Thickness of
Flange at
Bore
Minimum
Thickness of
Flange at Edge
of Undercut
(D-E)
Minimum
Thickness
20
6
8
1
1/2
1/2
20
8
10
1
1/2
1/2
24
12
15
1
1/2
1/2
30
12
15
1
1/2
1/2
1 FLANGES shall be of steel, quality SAE 1040 or equivalent, annealed plate, heat treated to R c 25-
30.
* For wheels under 1 1/4 inch thick F dimension shall not exceed 40% of wheel thickness.
TABLE 16
MINIMUM DIMENSIONS FOR STRAIGHT FLANGES FOR HEAVY DUTY,
HIGH SPEED FLOOR STAND GRINDERS1
12,500 S.F.P.M. TO 16,5000 S.F.P.M.
B
D
Wheel Diameter
Hole Diameter
Minimum Flange
Diameter
Minimum Thickness
of Flange at Bore
20
6 thru 10
8 thru 12
1
24
12
15
1
30
12
15
1
1 FLANGES shall be of steel, quality SAE 1040 or equivalent, annealed plate, heat treated to R c 25-
30.
TABLE 17
MINIMUM DIMENSIONS FOR FLANGES
FOR ARBORLESS WHEELS – ORGANIC BOND
Wheel
Diameter
Bolt Circle
“B” Minimum
Flange
Diameter
Torque Used in
Mounting
Ft. Lbs.
Minimum Hole Size
Dimensions. (8 holes)
(holes equally spaced)
16
6 1/2
8 7/8
30-40
All mounting holes shall be
17/32” inside diameter, with
a fiber bushing in place, not
to exceed 21/32” outside
diameter.
20
8
10 3/8
30-40
24
9 5/8
12
40-60
30
12
14 3/8
40-60
TABLE 18
MINIMUM DIMENSIONS FOR STRAIGHT FLANGES
USED AS WHEEL SLEEVES FOR PRECISION GRINDING ONLY
B
D
E
Wheel Diameter
Wheel Hole
Diameter
Minimum
Outside
Diameter of
Flange
Minimum
Thickness of
Flange at Bore
Minimum
Thickness of
Flange at Edge of
Undercut
Inches
Inches
Inches
Inches
Inches
12 to 14
5
7
1/2
7/16
Larger than
14 to 20
5
7
5/8
7/16
6
8
5/8
7/16
8
10
5/8
7/16
10
11 1/2
5/8
7/16
12
13 1/2
5/8
7/16
Larger than
20 to 30
8
10
3/4
1/2
10
11 1/2
3/4
1/2
12
13 1/2
3/4
1/2
16
17 1/2
3/4
1/2
Larger than
30 to 42
12
13 1/2
3/4
1/2
16
17 1/2
3/4
1/2
18
19 1/2
3/4
1/2
20
21 1/2
3/4
1/2
Larger than
42 to 60
16
20
1
3/4
20
24
1
3/4
24
29
1 1/8
7/8
Note: These flanges may be clamped together by means of a central nut,
or by a series of bolts or some other equivalent means of fastening.
For hole sizes smaller than shown in this table, use table 9.
TABLE 19
MINIMUM THICKNESS OF STEEL DISC WHEELS
(MACHINE FACE PLATE) FOR MOUNTING ABRASIVE DISCS
Diameter Inches
Minimum Thickness Inches
8 to 14 inclusive
1/2
15 to 18 inclusive
5/8
19 to 26 inclusive
3/4
27 to 36 inclusive
7/8
37 to 40 inclusive
1
41 to 72 inclusive
1 1/8
TABLE 20
MINIMUM THICKNESS OF STEEL DISC WHEELS
FOR MACHINES USING PLATE MOUNTED WHEELS HAVING THIN MOUNTING
PLATES
Abrasive Disc Diameter D (Inches)
Minimum Thickness Pt (Inches)
12 and smaller
3/8
14 to 16 inclusive
1/2
17 to 18 inclusive
5/8
19 to 26 inclusive
3/4
27 to 36 inclusive
7/8
TABLE 21
STANDARD MAXIMUM SPEEDS IN SURFACE FEET PER MINUTE
Classification
Number
Types of Wheels
(See Section 1 for Definitions)
Inorganic Bonds
Organic Bonds
Low
Strength
Medium
Strength
High
Strength
Low
Strength
Medium
Strength
High
Strength
OPERATING SPEED SHALL NOT EXCEED:
SFPM
SFPM
SFPM
SFPM
SFPM
SFPM
1
Type 1 – Straight Wheels – except
classifications 6, 7, 9, 10, 11, 12 and 13
below
5,500
6,000
6,500
6,500
8,000
9,500
Type 4* – Taper Side Wheels
Types 5, 7, 20, 21, 22, 23, 24, 25, 26
Recessed, Dovetailed and/or relieved
wheels. (Except Classification 7 below)
Type 12 – Dish Wheels
Type 13 – Saucer Wheels
Types 16, 17, 18, 19 – Cones and Plugs
2
Type 2 – Cylinder Wheels including plate
mounted, inserted nut and projecting
stud – Segments
5,000
5,500
6,000
5,000
6,000
7,000
3
Cup Shape Tool Grinding Wheels (For Fixed
Base Machines)
Type 6 – Straight Side Cups
Type 11 – Flaring Cups
4,500
5,000
6,000
6,000
7,500
8,500
4
Cup Shape Snagging Wheels (For Portable
Machines)
Type 6 – Straight Side Cups
Type 11 – Flaring Cups
4,500
5,500
6,500
6,000
8,000
9,500
5
Abrasive Discs: Plate Mounted Inserted Nut and
Projecting Stud:
Solid or Segmented
5,500
6,000
6,500
5,500
7,000
8,500
6†
Reinforced Wheels Type 1
Max. Dia. 4”
Max. Thickness 1/4"
X
X
X
9,500
12,500
16,000
Max. Dia. 10”
Max. Thickness 1/2"
X
X
X
9,500
12,500
14,200
TABLE 21
STANDARD MAXIMUM SPEEDS IN SURFACE FEET PER MINUTE
Classification
Number
Types of Wheels
(See Section 1 for Definitions)
Inorganic Bonds
Organic Bonds
Low
Strength
Medium
Strength
High
Strength
Low
Strength
Medium
Strength
High
Strength
OPERATING SPEED SHALL NOT EXCEED:
SFPM
SFPM
SFPM
SFPM
SFPM
SFPM
All Other Dias. and Thicknesses
X
X
X
9,500
12,500
12,500
Reinforced Wheels – Types 27 and 28
Max. Dia. 9”
Max. Thickness 3/8”
X
X
X
9,500
12,500
14,200
Max. Dia. 9” – Over 3/8” Thick
X
X
X
X
9,500
11,000
7
Type 1 Wheels for Bench and Pedestal Grinders
and Types 1 and 5 Surface Grinders in
following sizes only.
7” dia. up to 2” thick and up to 2” hole
5,500
6,325
6,600
6,500
8,000
9,500
8” dia. up to 2” thick and up to 2” hole
5,500
6,325
7,550
6,500
8,000
9,500
8
Diamond Wheels
Cutting-Off – IAI, IAIR, IAIRS**
X
X
16,000
X
X
16,000
Metal Bond
X
X
12,000
X
X
X
Resin Bond
X
X
X
X
X
9,500
Vitrified Bond
X
X
6,500
X
X
X
9
Cutting Off Wheels Type 1 and 27A
Larger than 16” dia., Including Reinforced
Organic
X
X
X
9,500
12,000
14,200
10
Cutting-Off Wheels Type 1 and 27A
16” dia., and smaller – Including Reinforced
Organic
X
X
X
9,500
12,000
16,000
11
Thread and Flute Grinding Wheels
8,000
10,000
12,000
8,000
10,000
12,000
12
Crankshaft and Camshaft Grinding Wheels
5,500
8,000
8,500
6,500
8,000
9,500
13
Type 1 Snagging Wheels 16” dia. and Larger,
Organic Bond, Non Reinforced Used on
Specifically Designed Swing Frame and
Mechanical Grinders
X
X
X
X
X
12,500
14
Internal Wheels – Type 1 and 5 Maximum dia.
6”
5,500
8,000
8,500
6,500
8,500
9,500
* Non-standard Shape.
† Classification 6 excludes cut-off wheels.
** Standard Diamond Wheel Shapes.
TABLE 22
WHEEL MANUFACUTERS TESTING SPEEDS
Class of Wheel
Operating Speed Surface
Feet Per Minute
Minimum Test Factor*
Cutting-off Wheels
All speeds
1.20
All Bonds and Wheel Types
(Except Cutting-off Wheels)
Up to 5,000
1.25
All Bonds and Wheel Types
(Except Cutting-off wheels)
Faster than 5,000
1.50
* Actual operating speed shall be multiplied by this test factor to establish minimum speed
at which wheels shall be tested by the wheel manufacturer.
TABLE 23
GROUP W – (PLAIN WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 3/32” MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2"
Overhang
& Thd. Mdls.
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
W 141
3/32
5/32
93,750
53,250
37,500
25,500
16,500
W 142
3/32
1/4
93,750
53,250
37,500
25,500
16,500
W 143
1/8
1/8
93,750
53,250
37,500
25,500
16,500
W 144
1/8
1/4
93,750
53,250
37,500
25,500
16,500
W 145
1/8
3/8
88,500
49,500
35,250
24,000
15,750
W 146
1/8
1/2
81,000
43,750
31,500
22,500
15,000
W 147
5/32
1/32
93,750
53,250
37,500
25,500
16,500
W 148
5/32
1/16
93,750
53,250
37,500
25,500
16,500
W 149
5/32
1/4
90,750
50,250
36,000
24,750
15,750
W 150
3/16
1/16
93,750
53,250
37,500
25,500
16,500
W 151
3/16
1/8
93,750
53,250
37,500
25,500
16,500
W 152
3/16
1/4
83,250
47,250
33,000
23,250
15,000
W 153
3/16
3/8
73,500
42,000
28,500
21,000
13,500
W 154
3/16
1/2
66,000
38,250
25,500
18,750
12,750
W 155
13/64
1/4
78,000
44,250
30,750
21,750
14,250
W 156
1/4
1/32
93,750
53,250
37,500
25,500
16,500
W 157
1/4
1/16
93,750
53,250
37,500
25,500
16,500
W 158
1/4
1/8
93,750
53,250
37,500
25,500
16,500
W 159
1/4
3/16
78,000
44,250
30,750
21,750
14,250
W 160
1/4
1/4
69,000
42,000
27,750
18,750
13,500
W 161
1/4
5/16
66,000
39,750
24,750
17,250
12,750
W 162
1/4
3/8
57,000
34,500
23,250
16,500
11,250
W 165
5/16
1/16
93,000
51,750
37,500
25,500
16,500
W 166
5/16
1/8
84,750
48,750
28,500
19,500
14,250
W 167
5/16
1/4
61,500
39,000
24,750
18,000
12,000
W 168
5/16
5/16
56,250
33,750
22,500
16,500
12,000
W 169
5/16
3/8
48,000
28,500
20,250
15,000
11,250
W 170
5/16
1/2
39,750
26,250
16,500
12,750
9,750
W 171
5/16
3/4
27,750
19,500
13,500
10,500
8,250
W 172
3/8
1/16
85,500
48,750
33,750
24,000
15,000
W 173
3/8
1/8
71,250
46,500
30,000
19,500
12,750
W 174
3/8
1/4
54,000
32,250
21,000
15,000
10,500
W 175
3/8
3/8
41,250
24,000
18,000
12,750
9,750
W 176
3/8
1/2
33,750
21,000
15,750
12,000
9,000
TABLE 24
GROUP W – (PLAIN WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 1/8” MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2"
Overhang
& Thd. Mdls.
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
W 143
1/8
1/8
105,000
64,500
46,650
32,400
21,370
W 144
1/8
1/4
105,000
64,500
46,650
32,400
21,370
W 145
1/8
3/8
105,000
64,500
46,650
32,400
21,370
W 146
1/8
1/2
105,000
64,500
46,650
32,400
21,370
W 151
5/16
1/8
105,000
64,500
46,650
32,400
21,370
W 152
3/16
1/4
105,000
64,500
46,650
32,400
21,370
W 153
3/16
3/8
80,850
52,500
37,500
26,250
17,620
W 154
3/16
1/2
70,500
46,500
31,500
21,970
15,220
W 157
1/4
1/16
123,000
65,525
47,770
33,150
21,750
W 158
1/4
1/8
105,000
64,500
46,650
32,400
21,370
W 159
1/4
3/16
92,400
57,370
39,370
27,900
18,900
W 160
1/4
1/4
81,370
51,000
34,120
24,000
16,870
W 161
1/4
5/16
77,250
45,970
30,900
22,500
16,120
W 162
1/4
3/8
68,400
42,370
28,870
20,850
15,000
W 163
1/4
1/2
60,000
38,020
26,250
18,750
13,870
W 164
1/4
3/4
45,900
30,000
21,750
15,900
11,850
W 165
5/16
1/16
107,400
62,470
41,250
29,250
20,250
W 166
5/16
1/8
96,970
57,000
35,620
25,120
18,000
W 167
5/16
1/4
75,000
47,570
31,120
22,500
15,750
W 168
5/16
5/16
68,400
41,770
28,650
21,000
15,000
W 169
5/16
3/8
61,650
37,720
27,000
19,870
14,250
W 170
5/16
1/2
52,500
33,000
23,020
16,650
12,600
W 171
5/16
3/4
37,120
25,500
18,750
14,620
10,020
W 172
3/8
1/16
99,370
59,250
41,020
29,250
20,250
W 173
3/8
1/8
87,600
53,250
35,250
24,750
17,250
W 174
3/8
1/4
69,000
41,250
27,750
20,400
15,000
W 175
3/8
3/8
54,000
33,000
24,150
18,000
13,500
W 176
3/8
1/2
45,370
28,500
21,000
15,900
12,150
W 177
3/8
3/4
33,750
23,250
17,620
13,650
10,350
W 178
3/8
1
26,250
18,750
14,250
10,870
8,250
W 181
1/2
1/16
76,390
55,500
36,750
25,500
17,850
W 182
1/2
1/8
73,500
43,650
29,100
20,770
15,450
W 183
1/2
1/4
51,750
31,870
22,500
17,250
12,900
W 184
1/2
3/8
41,020
26,400
19,500
15,000
11,400
W 185
1/2
1/2
34,500
22,500
16,870
13,120
9,900
W 186
1/2
3/4
26,250
17,400
12,750
9,750
8,020
W 187
1/2
1
20,620
13,870
10,120
7,870
6,370
TABLE 24
GROUP W – (PLAIN WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 1/8” MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2"
Overhang
& Thd. Mdls.
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
W 190
5/8
1/16
61,120
48,000
31,500
22,650
16,870
W 191
5/8
1/8
58,870
34,500
25,120
18,900
14,250
W 192
5/8
1/4
43,120
27,370
19,870
15,220
11,620
W 193
5/8
3/8
32,250
23,020
16,500
12,520
9,750
W 194
5/8
1/2
29,400
19,120
13,500
10,500
8,250
W 195
5/8
3/4
22,120
14,250
10,120
7,650
6,150
W 196
5/8
1
17,620
11,620
8,100
6,150
5,100
W 199
3/4
1/16
50,930
44,770
30,000
21,750
15,750
W 200
3/4
1/8
50,930
33,520
23,850
17,850
13,350
W 201
3/4
1/4
38,250
24,370
17,400
13,270
9,970
W 202
3/4
3/8
30,600
19,500
13,500
10,120
7,800
W 203
3/4
1/2
25,500
15,900
10,870
8,250
6,600
W 204
3/4
3/4
18,900
12,000
8,400
6,220
5,250
W 210
7/8
1/16
43,650
35,250
25,720
18,900
14,320
W 211
7/8
1/8
43,650
27,900
20,400
15,820
12,220
W 212
7/8
1/4
33, 750
20,400
14,400
11,020
9,000
W 213
7/8
3/8
27,000
16,870
11,250
8,250
6,600
W 215
1
1/8
38,200
24,900
18,000
13,870
10,500
W 216
1
1/4
30,520
18,600
12,750
9,520
7,500
TABLE 25
GROUP W – (PLAIN WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 3/16” MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2"
Overhang &
Thd. Mdls
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
W 158
1/4
1/8
121,500
66,750
48,000
36,000
26,250
W 159
1/4
3/16
112,500
63,000
47,250
34,650
25,120
W 160
1/4
1/4
103,500
60,000
44,250
33,000
24,000
W 161
1/4
5/16
93,750
58,120
42,750
31,870
22,500
W 162
1/4
3/8
89,250
56,250
41,250
30,000
21,750
W 163
1/4
1/2
78,750
52,500
39,000
28,870
20,620
W 164
1/4
3/4
62,250
39,750
30,000
23,250
16,500
W 166
5/16
1/8
118,500
65,250
47,250
35,250
25,500
W 167
5/16
1/4
100,500
58,500
43,500
35,620
23,250
W 168
5/16
5/16
93,000
57,000
42,000
30,750
22,120
W 169
5/16
3/8
87,370
55,350
40,870
28,880
21,000
W 170
5/16
1/2
76,500
47,250
34,500
25,500
18,750
W 171
5/16
3/4
57,000
37,500
27,750
21,750
15,750
W 173
3/8
1/8
101,900
65,250
46,500
34,500
24,750
W 174
3/8
1/4
98,850
57,750
42,750
32,250
23,250
W 175
3/8
3/8
81,750
50,620
36,750
27,750
20,250
W 176
3/8
1/2
66,750
43,120
31,350
23,620
17,400
W 177
3/8
3/4
54,000
36,000
26,250
20,250
15,000
W 178
3/8
1
42,000
29,250
22,500
17,250
12,900
W 182
1/2
1/8
76,390
56,250
39,870
29,250
21,750
W 183
1/2
1/4
75,000
47,400
33,370
24,900
18,750
W 184
1/2
3/8
57,750
39,750
29,250
21,750
15,750
W 185
1/2
1/2
49,870
33,750
25,500
19,500
14,620
W 186
1/2
3/4
39,000
28,120
21,370
15,750
12,000
W 187
1/2
1
32,250
23,250
18,370
13,500
10,500
W 188
1/2
1 1/2
22,870
17,620
13,870
11,250
----
W 189
1/2
2
17,250
13,500
10,500
8,620
----
W 191
5/8
1/8
61,120
51,370
36,370
27,000
20,250
W 192
5/8
1/4
61,120
43,500
30,750
23,400
18,000
W 193
5/8
3/8
52,500
34,870
25,500
18,750
15,000
W 194
5/8
1/2
44,400
31,120
23,400
18,000
13,500
W 195
5/8
3/4
34,500
24,000
18,370
14,250
10,500
W 196
5/8
1
25,870
18,900
15,000
11,620
9,370
W 197
5/8
2
14,770
11,770
8,700
7,270
----
W 200
3/4
1/8
50,930
48,750
33,750
25,500
19,500
W 201
3/4
1/4
50,930
37,500
27,900
21,370
16,500
W 202
3/4
3/8
45,750
31,500
24,370
18,000
13,870
TABLE 25
GROUP W – (PLAIN WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 3/16” MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2"
Overhang &
Thd. Mdls
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
W 203
3/4
1/2
39,750
27,370
20,620
15,900
12,000
W 204
3/4
3/4
29,250
20,250
15,000
12,000
9,370
W 205
3/4
1
24,750
17,250
12,750
10,500
8,620
W 206
3/4
1 1/4
19,500
14,250
11,620
9,000
6,750
W 207
3/4
1 1/2
16,500
12,370
9,750
7,870
----
W 208
3/4
2
12,750
9,370
7,500
6,000
----
W 211
7/8
1/8
43,650
43,650
31,870
24,000
18,370
W 212
7/8
1/4
43,650
34,500
25,870
19,870
14,620
W 213
7/8
3/8
42,370
28,120
21,370
16,500
12,370
W 215
1
1/8
38,200
38,200
31,120
23,620
18,000
W 216
1
1/4
38,200
33,750
24,750
19,120
14,250
W 217
1
3/8
38,200
27,000
19,870
15,750
12,000
W 218
1
1/2
32,700
22,120
16,870
12,900
10,350
W 219
1
3/4
25,120
17,620
12,900
9,900
8,400
W 220
1
1
19,500
14,250
11,250
8,620
7,120
W 221
1
1 1/2
13,120
9,370
7,120
6,000
----
W 222
1
2
9,000
7,120
5,620
4,870
----
W 225
1 1/4
1/4
30,560
28,870
21,220
16,270
12,300
W 226
1 1/4
3/8
30,560
22,120
16,350
12,750
10,270
W 227
1 1/4
1/2
27,750
19,120
13,950
10,650
8,700
W 228
1 1/4
3/4
20,620
14,620
11,020
8,770
7,120
W 229
1 1/4
1
16,500
12,000
8,620
6,900
5,770
W 230
1 1/4
1 1/4
13,270
9,150
6,970
5,700
----
W 231
1 1/4
1 1/2
10,270
7,270
6,000
5,100
----
W 232
1 1/4
2
7,500
6,000
4,870
4,500
----
W 235
1 1/2
1/4
25,470
24,900
18,900
15,150
11,770
W 236
1 1/2
1/2
25,470
18,750
13,870
10,500
8,620
W 237
1 1/2
1
15,750
11,250
7,870
6,370
5,620
W 238
1 1/2
1 1/2
9,900
6,970
5,470
4,870
----
TABLE 26
GROUP W – (PLAIN WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 1/4” MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2" Overhang
& Thd. Mdls
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
3”
4”
5”
W 176
3/8
1/2
81,000
54,379
42,000
33,000
25,500
20,400
13,260
9,550
W 177
3/8
3/4
66,000
46,500
32,250
27,370
21,000
16,800
10,920
7,860
W 178
3/8
1
55,200
40,500
30,000
23,250
17,250
13,800
8,970
6,460
W 179
3/8
1 1/4
45,750
33,750
25,720
19,720
15,300
12,240
7,960
5,730
W 182
1/2
1/8
76,390
62,400
45,750
35,400
27,250
22,020
14,310
10,300
W 183
1/2
1/4
76,390
54,750
40,500
31,120
24,000
19,200
12,480
8,990
W 184
1/2
3/8
71,250
47,620
35,020
27,000
20,850
16,680
10,840
7,800
W 185
1/2
1/2
61,500
42,000
31,500
24,000
18,370
14,700
9,560
6,880
W 186
1/2
3/4
51,000
36,370
27,750
21,220
16,120
12,900
8,390
6,040
W 187
1/2
1
40,500
30,000
24,000
18,750
14,250
11,400
7,410
5,340
W 188
1/2
1 1/2
30,370
24,000
18,900
15,000
12,000
9,600
6,240
4,490
W 189
1/2
2
24,000
18,750
15,000
12,150
9,900
7,920
5,150
3,710
W 190
5/8
1/16
61,120
61,120
48,000
31,500
29,020
23,220
15,090
10,800
W 191
5/8
1/8
61,120
60,000
44,250
34,500
27,000
21,600
14,040
10,110
W 192
5/8
1/4
61,120
51,750
38,400
29,770
23,250
18,680
12,140
8,740
W 193
5/8
3/8
61,120
45,500
33,370
25,870
20,100
16,080
10,450
7,520
W 194
5/8
1/2
56,400
39,750
29,400
22,720
17,400
13,920
9,050
6,520
W 195
5/8
3/4
46,500
32,400
24,900
19,720
15,370
12,300
8,000
5,760
W 196
5/8
1
35,250
27,000
21,300
16,870
13,120
10,500
6,830
4,920
W 197
5/8
2
21,000
16,500
12,900
10,870
8,700
6,960
4,520
3,250
W 198
5/8
2 1/2
16,500
12,900
10,870
8,700
7,000
5,600
3,640
2,620
W 201
3/4
1/4
50,930
50,930
38,100
29,020
22,500
18,000
11,700
8,420
W 202
3/4
3/8
50,930
44,100
32,400
25,120
19,350
15,480
10,060
7,240
W 203
3/4
1/2
50,930
36,370
27,750
21,750
16,870
13,500
8,780
6,320
W 204
3/4
3/4
42,750
30,750
23,250
18,000
14,020
11,220
7,290
5,250
W 205
3/4
1
34,500
25,870
19,500
15,000
12,000
9,600
6,240
4,490
W 206
3/4
1 1/4
28,720
21,520
17,020
13,500
10,800
8,640
5,620
4,050
W 207
3/4
1 1/2
24,000
18,520
14,620
12,000
9,900
7,920
5,150
3,710
W 208
3/4
2
18,750
15,370
12,000
9,900
8,000
6,400
4,160
3,000
W 209
3/4
2 1/2
15,000
12,150
10,500
8,400
6,800
5,440
3,540
2,550
W 211
7/8
1/8
43,650
43,650
42,900
33,000
26,250
21,000
13,650
9,820
W 212
7/8
1/4
43,650
43,650
35,100
27,600
21,370
17,100
11,120
8,010
W 213
7/8
3/8
43,650
40,870
29,400
23,400
18,370
14,700
9,560
6,880
W 215
1
1/8
38,200
38,200
38,200
33,750
25,500
20,400
13,260
9,550
W 216
1
1/4
38,200
38,200
33,750
26,250
20,250
16,200
10,530
7,580
W 217
1
3/8
38,200
38,200
28,500
22,500
17,400
13,920
9,050
6,520
W 218
1
1/2
38,200
32,770
24,900
19,500
14,850
11,880
7,720
5,560
TABLE 26
GROUP W – (PLAIN WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 1/4” MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2" Overhang
& Thd. Mdls
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
3”
4”
5”
W 219
1
3/4
35,100
24,520
18,750
15,000
12,000
9,600
6,240
4,490
W 220
1
1
25,500
19,120
15,750
12,370
10,500
8,400
5,460
3,930
W 221
1
1 1/2
19,120
14,620
12,000
10,500
8,400
6,720
4,370
3,150
W 222
1
2
15,900
12,370
9,750
8,620
6,900
5,520
3,590
2,580
W 223
1
2 1/2
12,370
9,900
8,620
6,900
5,500
4,400
2,860
2,060
W 225
1 1/4
1/4
30,560
30,560
30,560
24,000
18,750
15,000
9,750
7,020
W 226
1 1/4
3/8
30,560
30,560
26,250
20,100
15,750
12,600
8,190
5,900
W 227
1 1/4
1/2
30,560
29,620
22,650
18,000
14,100
11,280
7,330
5,280
W 228
1 1/4
3/4
30,520
22,500
17,850
14,250
11,400
9,120
5,930
4,270
W 229
1 1/4
1
24,000
18,750
15,370
12,000
9,900
7,920
5,150
3,710
W 230
1 1/4
1 1/4
20,400
15,900
12,750
10,500
8,400
6,720
4,370
3,150
W 231
1 1/4
1 1/2
17,620
13,500
10,650
9,000
7,200
5,760
3,740
2,690
W 232
1 1/4
2
14,250
10,650
9,000
7,500
6,000
4,800
3,120
2,250
W 235
1 1/2
1/4
25,470
25,470
25,470
22,720
17,620
14,100
9,170
6,600
W 236
1 1/2
1/2
25,470
25,470
21,750
17,250
13,650
10,920
7,100
5,110
W 237
1 1/2
1
22,500
17,620
13,270
10,870
9,520
7,620
4,950
3,560
W 238
1 1/2
1 1/2
15,600
12,000
9,750
8,250
6,600
5,280
3,430
2,470
W 239
1 1/2
2
12,750
9,900
8,000
6,400
5,100
4,080
2,650
1,910
W 240
1 1/2
2 1/2
10,500
8,400
6,800
5,500
4,400
3,520
2,290
1,650
W 241
1 1/2
3
9,000
7,250
6,000
4,800
3,900
3,120
2,030
1,460
W 242
2
1
19,100
15,950
11,750
10,000
8,800
7,040
4,580
3,300
W 243
2
1 1/2
14,500
12,750
9,800
7,800
6,300
5,040
3,280
2,360
W 244
2
2
11,750
10,500
7,500
6,200
5,030
4,000
2,600
1,870
W 245
2
2 1/2
9,600
7,250
6,400
5,300
4,250
3,400
2,210
1,590
W 246
2
3
8,250
6,750
5,600
4,600
3,700
2,960
1,920
1,380
TABLE 27
GROUP W – (PLAIN WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 3/8” MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2"
Overhang
& Thd. Mdls
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
3”
4”
5”
W 185
1/2
1/2
76,390
76,390
63,000
48,000
36,740
29,400
19,120
13,760
W 186
1/2
3/4
76,390
72,740
55,500
42,440
32,240
25,800
16,780
12,080
W 187
1/2
1
76,390
60,000
48,000
37,500
28,500
22,800
14,820
10,680
W 188
1/2
1 1/2
60,740
48,000
37,800
30,000
24,000
19,200
12,480
8.980
W 189
1/2
2
48,000
37,500
30,000
24,300
19,800
15,840
10,300
7,420
W 194
5/8
1/2
61,120
61,120
58,880
45,440
34,800
27,840
18,100
13,040
W 195
5/8
3/4
61,120
61,120
49,800
39,440
30,740
24,600
16,000
11,520
W 196
5/8
1
61,120
54,000
42,600
33,740
26,240
21,000
13,660
9,840
W 197
5/8
2
42,000
33,000
25,800
21,740
17,400
13,970
9,040
6,500
W 198
5/8
2 1/2
33,000
25,800
21,740
17,400
14,000
11,200
7,280
5,240
W 203
3/4
1/2
50,930
50,930
50,930
43,500
33,740
27,000
17,560
12,640
W 204
3/4
3/4
50,930
50,930
46,500
36,000
28,040
22,440
14,580
10,500
W 205
3/4
1
50,930
50,930
39,000
30,000
24,000
19,200
12,480
8,980
W 206
3/4
1 1/4
50,930
43,040
34,040
27,000
21,600
17,280
11,240
8,100
W 207
3/4
1 1/2
48,000
37,040
29,240
24,000
19,800
15,840
10,300
7,420
W 208
3/4
2
37,500
30,740
24,000
19,800
16,000
12,800
8,320
6,000
W 209
3/4
2 1/2
30,000
24,300
21,000
16,800
13,600
10,880
7,080
5,100
W 218
1
1/2
38,200
38,200
38,200
38,200
29,700
23,760
15,440
11,120
W 219
1
3/4
38,200
38,200
37,500
30,000
24,000
19,200
12,480
8,980
W 220
1
1
38,200
38,200
31,500
24,740
21,000
16,800
10,920
7,860
W 221
1
1 1/2
38,200
29,240
24,000
21,000
16,800
13,440
8,740
6,300
W 222
1
2
31,800
24,740
19,500
17,240
13,800
11,040
7,180
5,160
W 223
1
2 1/2
24,740
19,800
17,240
13,800
11,000
8,800
5,720
4,120
W 227
1 1/4
1/2
30,560
30,560
30,560
30,560
28,200
22,560
14,660
10,560
W 228
1 1/4
3/4
30,560
30,560
30,560
28,500
22,800
18,240
11,860
8,540
W 229
1 1/4
1
30,560
30,560
30,560
24,000
19,800
15,840
10,300
7,420
W 230
1 1/4
1 1/4
30,560
30,560
25,500
21,000
16,800
13,440
8,740
6,300
W 231
1 1/4
1 1/2
30,560
27,000
21,300
18,000
14,400
11,520
7,480
5,380
W 232
1 1/4
2
28,500
21,300
18,000
15,000
12,000
9,600
6,240
4,500
W 236
1 1/2
1/2
25,470
25,470
25,470
25,470
25,470
21,840
14,200
10,220
W 237
1 1/2
1
25,470
25,470
25,470
21,470
19,040
15,240
9,900
7,120
W 238
1 1/2
1 1/2
25,470
24,000
19,500
16,500
13,200
10,560
6,860
4,940
W 239
1 1/2
2
25,470
19,800
16,000
12,800
10,200
8,160
5,300
3,820
W 240
1 1/2
2 1/2
21,000
16,800
13,600
11,000
8,800
7,040
4,580
3,300
W 241
1 1/2
3
18,000
14,500
12,000
9,600
7,800
6,240
4,060
2,920
W 242
2
1
19,100
19,100
19,100
19,100
17,600
14,080
9,160
6,600
W 243
2
1 1/2
19,100
19,100
19,100
15,600
12,600
10,080
6,560
4,720
W 244
2
2
19,100
19,100
15,000
12,400
10,000
8,000
5,200
3,740
W 245
2
2 1/2
19,100
14,500
12,800
10,600
8,500
6,800
4,420
3,180
W 246
2
3
16,500
13,500
11,200
9,200
7,400
5,920
3,840
2,760
TABLE 28
GROUP B – (SHAPED WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 3/32” MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2"
Overhang
& Thd. Mdls.
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
B 43
1/4
5/16
67,500
41,250
27,000
18,750
12,750
B 44
7/32
3/8
57,000
34,500
22,500
16,500
11,250
B 45
3/16
5/16
86,250
50,250
35,250
24,000
15,000
B 46
1/8
5/16
87,000
52,500
36,750
24,750
16,500
B 47
1/8
5/32
87,000
52,500
36,750
24,750
16,500
B 53
1/4
5/8
49,500
30,750
20,250
14,250
10,500
B 55
1/8
1/4
87,000
52,500
36,750
24,750
16,500
B 63
1/4
3/16
76,500
46,500
30,750
21,750
14,250
B 64
1/4
1/16
87,000
52,500
36,750
24,750
16,500
B 65
1/8
1/8
87,000
52,500
36,750
24,750
16,500
B 70
3/4
1/8
50,930
33,750
21,750
15,750
11,250
B 71
5/8
1/8
61,120
39,000
24,750
17,250
12,750
B 72
1/2
1/8
60,750
35,250
23,250
16,500
12,000
B 73
1/2
1/8
60,750
35,250
23,250
16,500
12,000
B 74
7/32
3/32
87,000
52,500
36,750
24,750
16,500
B 81
3/4
3/16
50,930
33,750
21,750
15,750
11,250
B 82
1/2
1/4
67,500
41,250
27,000
18,750
12,750
B 83
3/8
3/16
72,750
43,500
27,750
19,500
12,750
B 84
5/16
3/16
87,000
52,500
36,750
24,750
16,500
B 92
1/4
1/4
67,500
41,250
27,000
18,750
12,750
B 93
3/16
3/16
87,000
52,500
36,750
24,750
16,500
B 94
11/64
3/32
87,000
52,500
36,750
24,750
16,500
B 95
1/8
3/16
87,000
52,500
36,750
24,750
16,500
B 96
1/8
1/4
87,000
52,500
36,750
24,750
16,500
B 97
1/8
3/8
87,000
52,500
36,750
24,750
16,500
B 98
3/32
1/4
87,000
52,500
36,750
24,750
16,500
B 104
5/16
3/8
57,000
34,500
22,500
16,500
11,250
B 105
1/4
1/4
86,250
50,250
35,250
24,000
15,000
B 106
1/8
7/64
87,000
52,500
36,750
24,750
16,500
B 112
3/8
1/2
37,500
23,250
16,500
12,750
9,000
B 113
1/4
1/4
67,500
41,250
27,000
18,750
12,750
B 114
7/32
3/8
57,000
34,500
22,500
16,500
11,250
B 115
3/32
1/8
87,000
52,500
36,750
24,750
16,500
B 122
3/8
3/8
51,000
30,750
21,000
15,000
10,500
B 123
3/16
3/16
86,250
50,250
35,250
24,000
15,000
B 124
1/8
1/8
87,000
52,500
36,750
24,750
16,500
TABLE 29
GROUP B – (SHAPED WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 1/8” MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2"
Overhang
& Thd. Mdls.
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
B 41
5/8
5/8
33,750
23,250
17,620
13,650
10,350
B 42
½
3/4
33,750
23,250
17,620
13,650
10,350
B 43
¼
5/16
81,370
51,000
34,120
24,000
16,870
B 44
7/32
3/8
68,400
42,370
28,870
20,850
15,000
B 45
3/16
5/16
104,250
61,870
44,620
30,900
20,250
B 46
1/8
5/16
105,000
64,500
46,650
32,400
21,370
B 47
1/8
5/32
105,000
64,500
46,650
32,400
21,370
B 51
7/16
3/4
45,370
28,500
21,000
15,900
12,150
B 52
3/8
3/4
43,370
28,500
21,000
15,900
12,150
B 53
¼
5/8
60,000
38,020
26,250
18,750
13,870
B 54
¼
1/2
60,000
38,020
26,250
18,750
13,870
B 55
1/8
1/4
105,000
64,500
46,550
32,400
21,370
B 61
3/4
5/16
38,250
24,370
17,400
13,270
9,970
B 62
1/2
3/8
41,020
26,400
19,500
15,000
11,400
B 63
1/4
3/16
92,400
57,370
39,370
27,900
18,900
B 64
1/4
1/16
105,000
64,500
46,650
32,400
21,370
B 65
1/8
1/8
105,000
64,500
46,650
32,400
21,370
B 70
3/4
1/8
50,930
41,250
27,750
20,400
15,000
B 71
5/8
1/8
61,120
48,000
31,500
22,650
16,870
B 72
1/2
1/8
73,500
43,650
29,100
20,770
15,450
B 73
1/2
1/8
73,500
43,650
29,100
20,700
15,450
B 74
7/32
3/32
105,000
64,500
46,650
32,400
21,370
B 81
3/4
3/16
50,930
41,250
27,750
20,400
15,000
B 82
1/2
1/4
76,390
51,000
34,120
24,000
16,870
B 83
3/8
3/16
87,600
53,250
35,250
24,750
17,250
B 84
5/16
3/16
105,000
64,500
46,650
32,400
21,370
B 91
1/2
5/8
34,500
22,500
16,870
13,120
9,900
B 92
1/4
1/4
81,370
51,000
34,120
24,000
16,870
B 93
3/16
3/16
105,000
64,500
46,650
32,400
21,370
B 94
11/64
3/32
105,000
64,500
46,650
32,400
21,370
B 95
1/8
3/16
105,000
64,500
46,650
32,400
21,370
B 96
1/8
1/4
105,000
64,500
46,650
32,400
21,370
B 97
1/8
3/8
105,000
64,500
46,650
32,400
21,370
B 98
3/32
1/4
105,000
64,500
46,650
32,400
21,370
B 101
5/8
11/16
33,750
23,250
17,620
13,650
10,350
TABLE 29
GROUP B – (SHAPED WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 1/8” MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2"
Overhang
& Thd. Mdls.
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
B 102
5/8
1/2
45,370
28,500
21,000
15,900
12,150
B 103
5/8
3/16
61,120
41,250
27,750
20,400
15,000
B 104
5/16
3/8
68,400
42,370
28,870
20,850
15,000
B 105
1/4
1/4
104,250
61,870
44,620
30,900
20,250
B 106
1/8
7/64
105,000
64,500
46,650
32,400
21,370
B 111
7/16
11/16
33,750
23,250
17,620
13,650
10,350
B 112
3/8
1/2
45,370
28,500
21,000
15,900
12,150
B 113
1/4
1/4
81,370
51,000
34,120
24,000
16,870
B 114
7/32
3/8
68,400
42,370
28,870
20,850
15,000
B 115
3/32
1/8
105,000
64,500
46,650
32,400
21,370
B 121
1/2
1/2
45,370
28,500
21,000
15,900
12,150
B 122
3/8
3/8
61,650
37,720
27,000
19,870
14,250
B 123
3/16
3/16
104,250
61,820
44,620
30,900
20,250
B 124
1/8
1/8
105,000
64,500
46,650
32,400
21,370
B 131
1/2
1/2
34,500
22,500
16,870
13,120
9,900
B 132
3/8
1/2
45,370
28,500
21,000
15,900
12,150
B 133
3/8
3/8
54,000
33,000
24,150
18,000
13,500
B 134
5/16
3/8
61,650
37,720
27,000
19,870
14,250
B 135
1/4
1/2
60,000
38,020
26,250
18,750
13,870
B 136
1/4
5/16
77,250
45,920
30,900
22,500
16,120
TABLE 30
GROUP B – (SHAPED WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 1/4" MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2"
Overhang &
Thd. Mdls.
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
B 41
5/8
5/8
61,120
46,500
35,250
27,370
21,000
B 42
1/2
3/4
61,120
46,500
35,250
27,370
21,000
B 51
7/16
3/4
81,000
54,370
42,000
33,000
25,500
B 52
3/8
3/4
81,000
54,370
42,000
33,000
25,500
B 61
3/4
5/16
50,930
50,930
38,100
29,020
22,500
B 62
1/2
3/8
71,250
47,620
35,020
27,000
20,850
B 71
5/8
1/8
61,120
61,120
48,000
37,500
29,020
B 72
1/2
1/8
76,390
62,400
45,750
35,400
27,520
B 73
1/2
1/8
76,390
62,400
45,750
35,400
27,520
B 91
1/2
5/8
61,500
42,000
31,500
24,000
18,370
B 101
5/8
11/16
61,120
46,500
35,250
27,370
21,000
B 102
5/8
1/2
61,120
54,370
42,000
33,000
25,500
B 111
7/16
11/16
66,000
46,500
35,250
27,370
21,000
B 112
3/8
1/2
81,000
54,370
42,000
33,000
25,500
B 121
1/2
1/2
76,390
54,370
42,000
33,000
25,500
B 131
1/2
1/2
61,500
42,000
31,500
24,000
18,370
B 132
3/8
1/2
81,000
54,370
42,000
33,000
25,500
TABLE 31
GROUP A – (SHAPED WHEELS)
MAXIMUM OPERATING SPEEDS (RPM) FOR 1/4" MANDRELS
Shape
No.
Wheel
Diameter
Inches
Wheel
Thickness
Inches
1/2"
Overhang &
Thd. Mdls.
Overhang – Dimension O
1”
1 1/2"
2”
2 1/2"
3”
A 1
3/4
2 1/2
19,800
16,500
13,120
10,650
9,000
6,750
A 2
1
1 1/4
38,200
32,620
25,500
20,620
16,870
13,500
A 3
1
2 3/4
16,100
13,080
10,730
8,720
6,710
4,700
A 4
1 1/4
1 1/4
30,560
24,750
20,250
16,120
13,120
10,500
A 5
3/4
1 1/8
45,000
33,750
27,000
21,000
16,500
13,500
A 6
3/4
1 1/8
39,000
29,700
24,000
18,970
15,000
12,000
A 11
7/8
2
19,860
15,100
12,000
9,810
8,220
7,020
A 12
11/16
1 1/4
48,000
35,250
27,370
21,750
17,250
13,500
A 13
1 1/8
1 1/8
33,950
32,250
25,500
20,620
16,500
12,750
A 14
11/16
7/8
55,560
40,500
30,750
24,370
19,500
15,000
A 15
1/4
1 1/16
72,750
47,620
34,500
26,250
19,870
13,870
A 21
1
1
34,500
26,250
21,000
17,250
13,870
10,870
A 22
3/4
5/8
50,930
40,500
30,750
24,370
19,500
15,000
A 23
3/4
1
39,370
30,370
24,370
19,500
15,000
12,000
A 24
1/4
3/4
76,500
49,500
36,370
27,000
20,250
15,370
A 25
1
1
35,620
27,370
22,120
18,000
14,250
11,250
A 26
5/8
5/8
61,120
46,500
35,250
27,750
21,370
15,750
A 31
1 3/8
1
27,780
26,250
21,000
17,250
13,500
10,870
A 32
1
5/8
38,200
38,200
30,000
24,000
18,900
15,000
A 33
1
1/2
38,200
38,200
30,000
24,000
18,900
15,000
A 34
1 1/2
3/8
25,470
25,470
25,470
21,970
18,000
13,870
A 35
1
3/8
38,200
38,200
31,500
25,500
20,250
15,900
A 36
1 5/8
3/8
23,520
23,520
23,520
21,750
17,620
13,870
A 37
1 1/4
1/4
30,560
30,560
30,560
28,100
22,500
18,000
A 38
1
1
34,500
26,250
21,000
17,020
13,500
10,650
A 39
3/4
3/4
47,250
35,250
27,750
22,120
17,250
13,120