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Shaft Arbor and Keyseat Dimensional Design 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

Shaft and Arbor Class A and B

 

Nominal Shaft (Arbor) and Keyseat Cutter Hole Diameter ARBOR AND KEYSEAT

Nominal Size Square Key

Arbor and Keyseat
A A B B
Max. Min. Max. Min.
1⁄2 3⁄32 0.0947 0.0937 0.4531 0.4481
5⁄8 1⁄8 0.1260 0.1250 0.5625 0.5575
3⁄4 1⁄8 0.1260 0.1250 0.6875 0.6825
7⁄8 1⁄8 0.1260 0.1250 0.8125 0.8075
1 1⁄4 0.2510 0.2500 0.8438 0.8388
11⁄4 5⁄16 0.3135 0.3125 1.0630 1.0580
11⁄2 3⁄8 0.3760 0.3750 1.2810 1.2760
13⁄4 7⁄16 0.4385 0.4375 1.5000 1.4950
2 1⁄2 0.5010 0.5000 1.6870 1.6820
21⁄2 5⁄8 0.6260 0.6250 2.0940 2.0890
3 3⁄4 0.7510 0.7500 2.5000 2.4950
31⁄2 7⁄8 0.8760 0.8750 3.0000 2.9950
4 1 1.0010 1.0000 3.3750 3.3700
41⁄2 11⁄8 1.1260 1.1250 3.8130 3.8080
5 11⁄4 1.2510 1.2500 4.2500 4.2450

All dimensions given in inches.

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