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Group "W" Plain Shapes
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Group "W" Shapes with 1/8" Mandrels

Shape No. Wheel Diameter Wheel Thickness MAX RPM 1/2" Overhang MAX RPM 1" Overhang MAX RPM 1-1/2" Overhang
W160 1/4 1/4 81,370 51,000 34,120
W162 1/4 3/8 68,370 42,370 28,870
W163 1/4 1/2 60,000 38,020 26,250
W164 1/4 3/4 45,900 30,000 21,750
W174 3/8 1/4 69,000 41,250 27,750
W175 3/8 3/8 54,000 33,000 24,150
W176 3/8 1/2 45,370 28,500 21,000
W177 3/8 3/4 33,750 23,250 17,620
W178 3/8 1 26,250 18,750 14,250
W183 1/2 1/4 51,750 31,870 22,500
W184 1/2 3/8 41,020 26,400 19,500
W185 1/2 1/2 34,500 22,500 16,870
W186 1/2 3/4 26,250 17,400 12,750
W187 1/2 1 20,620 13,870 10,120
W201 3/4 1/4 38,250 24,370 17,400
W202 3/4 3/8 30,600 19,500 13,500
W203 3/4 1/2 25,500 15,900 10,870
W216 1 1/4 30,520 18,600 12,750


Group "W" Shapes with 1/4" Mandrels

Shape No. Wheel Diameter Wheel Thickness MAX RPM 1/2" Overhang MAX RPM 1" Overhang MAX RPM 1-1/2" Overhang
W176 3/8 1/2 81,000 54,380 42,000
W177 3/8 3/4 66,000 46,500 32,250
W178 3/8 1 55,200 40,500 30,000
W179 3/8 1-1/4 45,750 33,750 25,720
W183 1/2 1/4 76,390 54,750 40,500
W184 1/2 3/8 71,250 47,620 35,020
W185 1/2 1/2 61,500 42,000 31,500
W186 1/2 3/4 51,000 36,370 27,750
W187 1/2 1 40,500 30,000 24,000
W188 1/2 1-1/2 30,370 24,000 18,900
W189 1/2 2 24,000 18,750 15,000
W196 5/8 1 35,250 27,000 21,300
W197 5/8 2 21,000 16,500 12,900
W201 3/4 1/4 50,930 50,930 38,100
W202 3/4 3/8 50,930 44,100 32,400
W203 3/4 1/2 50,930 36,370 27,750
W204 3/4 3/4 42,750 30,750 23,250
W205 3/4 1 34,500 25,870 19,500
W207 3/4 1-1/2 24,000 18,520 14,620
W208 3/4 2 18,750 15,370 12,000
W216 1 1/4 38,200 38,200 33,750
W217 1 3/8 38,200 38,200 28,500
W218 1 1/2 38,200 32,770 24,900
W220 1 1 25,550 19,120 15,750
W221 1 1-1/2 19,120 14,620 12,000
W222 1 2 15,900 12,370 9,750
W225 1-1/4 1/4 30,560 30,560 30,560
W226 1-1/4 3/8 30,560 30,560 26,250
W227 1-1/4 1/2 30,560 29,620 22,650
W228 1-1/4 3/4 30,520 22,500 17,850
W230 1-1/4 1-1/4 20,400 15,900 12,750
W232 1-1/4 2 14,250 10,650 9,000
W235 1-1/2 1/4 25,470 25,470 25,470
W236 1-1/2 1/2 25,470 25,470 21,750
W237 1-1/2 1 22,500 17,620 13,270
W238 1-1/2 1-1/2 15,600 12,000 9,750
W242 2 1 19,100 15,950 11,750
Warning! Grinding Wheels Improperly Used Are Dangerous!
Comply with American National Standards Institute (ANSI) B-7.1 Safety Requirements For The Use, Care And Protection of Abrasive Wheels. Copies of this publication are available from the Grinding Wheel Institute, 30200 Detroit Ave., Cleveland, OH 44145, or ANSI, 1430 Broadway, New York, NY 10018.


These mounted wheels are used in a wide variety of off-hand operations such as portable polishing and die grinding as well as a number of hole or bore and polishing operations. In that the mounting procedure is basically different from other grinding operations (the mounted wheel is usually mounted in a chuck whereas normal grinding wheels are mounted on an arbor between flanges), it is important that correct grinding practice be observed, particularly the overhang, so that the operation will be safe.

WARNING:

  • Never exceed the maximum RPM for each mounted wheel listed here for the standard mandrel with 1/2 overhang.
  • Refer to ANSI B7.1 safety standard.
  • Always wear eye and face protection.
 Diagram of overhang (1708 bytes)OVERHANG IS THE DISTANCE FROM SUPPORT TO BASE OF WHEEL (0 in illustration)

Increasing the overhang (distance from end of support to base of wheel) will lower the maximum speed. Reducing the overhang (pushing the mandrel back into the chuck) will raise the maximum speed.