Library › Hardware › Square keys, inch (ANSI B17.1): 3/32 to 1/2 in

0.09375 in square key × 3 in, for shafts over 0.3125 up to 0.4375 in (keyway depth k/2 in shaft and hub)

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

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From the full sheet

Square keys, inch (ANSI B17.1): 3/32 to 1/2 in: every size, notes, mating features and sources. What key goes on a 1 inch shaft?

Other sizes

0.09375 in square key × 0.75 in, for shafts over 0.3125 up to 0.4375 in (keyway depth k/2 in shaft and hub)
0.09375 in square key × 1 in, for shafts over 0.3125 up to 0.4375 in (keyway depth k/2 in shaft and hub)
0.09375 in square key × 1.5 in, for shafts over 0.3125 up to 0.4375 in (keyway depth k/2 in shaft and hub)
0.09375 in square key × 2 in, for shafts over 0.3125 up to 0.4375 in (keyway depth k/2 in shaft and hub)
0.125 in square key × 0.75 in, for shafts over 0.4375 up to 0.5625 in (keyway depth k/2 in shaft and hub)
0.125 in square key × 1 in, for shafts over 0.4375 up to 0.5625 in (keyway depth k/2 in shaft and hub)
0.125 in square key × 1.5 in, for shafts over 0.4375 up to 0.5625 in (keyway depth k/2 in shaft and hub)
0.125 in square key × 2 in, for shafts over 0.4375 up to 0.5625 in (keyway depth k/2 in shaft and hub)
0.125 in square key × 3 in, for shafts over 0.4375 up to 0.5625 in (keyway depth k/2 in shaft and hub)
0.1875 in square key × 0.75 in, for shafts over 0.5625 up to 0.875 in (keyway depth k/2 in shaft and hub)
0.1875 in square key × 1 in, for shafts over 0.5625 up to 0.875 in (keyway depth k/2 in shaft and hub)
0.1875 in square key × 1.5 in, for shafts over 0.5625 up to 0.875 in (keyway depth k/2 in shaft and hub)
0.1875 in square key × 2 in, for shafts over 0.5625 up to 0.875 in (keyway depth k/2 in shaft and hub)
0.1875 in square key × 3 in, for shafts over 0.5625 up to 0.875 in (keyway depth k/2 in shaft and hub)
0.25 in square key × 0.75 in, for shafts over 0.875 up to 1.25 in (keyway depth k/2 in shaft and hub)
0.25 in square key × 1 in, for shafts over 0.875 up to 1.25 in (keyway depth k/2 in shaft and hub)
0.25 in square key × 1.5 in, for shafts over 0.875 up to 1.25 in (keyway depth k/2 in shaft and hub)
0.25 in square key × 2 in, for shafts over 0.875 up to 1.25 in (keyway depth k/2 in shaft and hub)
0.25 in square key × 3 in, for shafts over 0.875 up to 1.25 in (keyway depth k/2 in shaft and hub)
0.3125 in square key × 0.75 in, for shafts over 1.25 up to 1.375 in (keyway depth k/2 in shaft and hub)
0.3125 in square key × 1 in, for shafts over 1.25 up to 1.375 in (keyway depth k/2 in shaft and hub)
0.3125 in square key × 1.5 in, for shafts over 1.25 up to 1.375 in (keyway depth k/2 in shaft and hub)
0.3125 in square key × 2 in, for shafts over 1.25 up to 1.375 in (keyway depth k/2 in shaft and hub)
0.3125 in square key × 3 in, for shafts over 1.25 up to 1.375 in (keyway depth k/2 in shaft and hub)
0.375 in square key × 0.75 in, for shafts over 1.375 up to 1.75 in (keyway depth k/2 in shaft and hub)
0.375 in square key × 1 in, for shafts over 1.375 up to 1.75 in (keyway depth k/2 in shaft and hub)
0.375 in square key × 1.5 in, for shafts over 1.375 up to 1.75 in (keyway depth k/2 in shaft and hub)
0.375 in square key × 2 in, for shafts over 1.375 up to 1.75 in (keyway depth k/2 in shaft and hub)
0.375 in square key × 3 in, for shafts over 1.375 up to 1.75 in (keyway depth k/2 in shaft and hub)
0.5 in square key × 0.75 in, for shafts over 1.75 up to 2.25 in (keyway depth k/2 in shaft and hub)
0.5 in square key × 1 in, for shafts over 1.75 up to 2.25 in (keyway depth k/2 in shaft and hub)
0.5 in square key × 1.5 in, for shafts over 1.75 up to 2.25 in (keyway depth k/2 in shaft and hub)
0.5 in square key × 2 in, for shafts over 1.75 up to 2.25 in (keyway depth k/2 in shaft and hub)
0.5 in square key × 3 in, for shafts over 1.75 up to 2.25 in (keyway depth k/2 in shaft and hub)