Shaft (Arbor) Keyway Dimension Size Data

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

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
Nominal Shaft (Arbor) and Keyseat Cutter Hole Diameter	Nominal Size Square 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.