Keyway Slot Dimensions

Keyway Chart

The following tables show standard dimensions for keys and their grooves.

Woodruff Keyway Dimensions

The system also applies to orthogonal or linear features such as slots and keys. The system uses letters and numbers. The letters indicate the clearance while the number specifics the precision or tolerance. A capital letter refers to the hole size and lower-case letter refers to the shaft size. Keyway Bore Diameter Size Bore Reference -0.000 / +0.010 Height (d) (t) - DIM Keyway Width (w) AGMA 9002-A86 Inch Bore and ANSI B17.1 Square Keyway Tolerances Minimum 3.0000 0.7500 3.332 Maximum 3.0015 0.7530 3.342 Minimum 3.0625 0.7500 3.396 Maximum 3.0640 0.7530 3.406 Minimum 3.1250 0.7500 3.459 Maximum 3.1265 0.7530 3.469 Minimum 3.1875 0. Square keys are used for smaller shafts and rectangular faced keys are used for shaft diameters over 6.5 in (170 mm) or when the wall thickness of the mating hub is an issue. Set screws often accompany parallel keys to lock the mating parts into place. The keyway is a longitudinal slot in both the shaft and mating part. The keyway dimensions are also different from the English system. Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway. See dimensions W and h in Figure 1. Unless otherwise specified, the shaft keyway is assumed to be standard. Nominal key size b × h Applied shaft diameter d Key size Keyway size; b h c or r Standard size of b1 and b2 b1 tolerance （H8） b2 tolerance （F7） r1 and r2 t1 t2; Standard size Tolerance（p7） Standard size Tolerance （h9） Standard size Tolerance Standard size Tolerance; 4×4: 10 or more and 13 or below: 4 +0.024 +0.012: 4.

Metric – Rectangular
B.S.4235 : PART 1 : 1972

Imperial – Rectangular
B.S.46 : PART 1 : 1958

Keyway Slot Dimensions Free

Imperial – Square
B.S.46 : PART 1 : 1958