Table 2. Keyway Dimensions and Tolerances for Metric Square and Rectangular Parallel Keys ANSI/ASME B18.25.1M-1996 (Withdrawn) Table 2. (Continued) Keyway Dimensions and Tolerances for Metric Square and Rectangular Parallel Keys ANSI/ASME B18.25.1M-1996 (Withdrawn)
Keyway
Width.
Depth
Tolerance a and Resulting Fits b
Shaft, t 1
Hub, t 2
Radius, r
Normal Fit
Close Fit
Free Fit
Key size b × h (mm)
Shaft
Hub
Shaft and Hub
Shaft
Hub
Basic Size
Basic Size
Toler- ance
Basic Size
Toler ance Min. Max.
N9
Fit
JS9
Fit
P9
Fit
H9
Fit
D10 Fit
5
3.3 4.9 3.8 5.4 3.8 5.4 4.3 6.4 4.4 7.4 4.9 8.4
20 × 8 20 20 × 12 20 22 × 9 22 22 × 14 22 25 × 9 25 25 × 14 25 28 × 10 28 28 × 16 28 32 × 11 32 32 × 18 32 36 × 12 36 36 × 20 36 40 × 22 40 45 × 25 45 50 × 28 50 56 × 32 56 63 × 32 63 70 × 36 70 80 × 40 80
7.5 5.5 5.5 9 9 6
0 − 0.052
0.033L 0.052T
+0.026 − 0.026
0.059L 0.026T
0.011L 0.074T
+0.052 0
0.085L 0T
+0.149 +0.065
0.182L 0.065L
− 0.022 − 0.074
0.4 0.06
+0.2 0
+0.2 0
10
7 c
11 c
7.5 c
0 − 0.062
0.039L 0.062T
+0.031 − 0.031
0.070L 0.031T
0.013L 0.088T
+0.062 0
0.101L 0T
+0.180 +0.080
0.219L 0.080L
− 0.026 − 0.088
12 13 15 17 20 20 22 25
0.7 1.0
9.4 10.4 11.4 12.4 12.4 14.4 15.4 17.4 19.5
+0.3 0
+0.3 0
1.2 1.6
0 − 0.074
0.046L 0.074T
0.083L 0.037T
0.014L 0.106T
+0.074 0
0.120L 0T 0.139L 0T
+0.220 +0.100
0.266L 0.100L
+0.037 − 0.037
− 0.032 − 0.106
0.054L +0.0435 0.0975L − 0.037 0.017L +0.087 0 0.87T − 0.0435 0.0435T − 0.1254 0.1254T
+0 260 0.314L 28 +0.120 0.120L 31
2.0 2.5
90 × 45 90 0 100 × 50 100
− 0.087
a Some of the tolerances are expressed as plus-plus. See Tolerances on page 2539 for more information. b Resulting fits: L indicates a clearance between the key and keyway; T indicates an interference between the key and keyway. c This value differs from that given in ANSI/ASME B18.25.1M-1996 (Withdrawn), which is believed to be inaccurate.
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