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Shaft (Arbor) Keyway Dimension Data - ANSI/ASME B94.19
American National Standard Keys and Keyways

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The following is summarized from the American National Standard Keys and Keyways for Milling Cutters and Arbors ANSI/ASME B94.19-1997

Shaft and Arbor Class E and F

Nominal Shaft (Arbor) and Keyseat Cutter Hole Diameter
Nominal Size Square Key Shaft (Arbor) & Key
E E F F
Hole Dia. (Square) Max. Min. Max. Min.
1/⁄2 3⁄32 0.0932 0.0927 0.5468 0.5408
5/⁄8 1⁄8 0.1245 0.1240 0.6875 0.6815
3/⁄4 1⁄8 0.1245 0.1240 0.8125 0.8065
7⁄/8 1⁄8 0.1245 0.1240 0.9375 0.9315
1 1⁄4 0.2495 0.2490 1.0940 1.0880
1 1⁄/4 5⁄16 0.3120 0.3115 1.3750 1.3690
1 1⁄/2 3⁄8 0.3745 0.3740 1.6560 1.6500
1 3/⁄4 7⁄16 0.4370 0.4365 1.9380 1.9320
2 1⁄2 0.4995 0.4990 2.1880 2.1820
2 1⁄/2 5⁄8 0.6245 0.6240 2.7180 2.7120
3 3⁄4 0.7495 0.7490 3.2500 3.2440
3 1/⁄2 7⁄8 0.8745 0.8740 3.8750 3.8690
4 1 0.9995 0.9990 4.3750 4.3690
4 1/⁄2 11⁄8 1.1245 1.1240 4.9380 4.9320
5 11⁄4 1.2495 1.2490 5.5000 5.4940

All dimensions given in inches.

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