Table 2. Keyway Dimensions and Tolerances for Metric Square and Rectangular Parallel Keys ANSI/ASME B18.25.1M-1996 (Withdrawn)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
1
2 × 2 2 3 × 3 3 4 × 4 4 5 × 3 5 5 × 5 6 6 × 4 6 6 × 6 6 8 × 5 8 8 × 7 8 10 × 6 10 10 × 8 10 12 × 6 12 12 × 8 12 14 × 6 14 14 × 9 14 16 × 7 16 16 × 10 16 18 × 7 18 18 × 11 18
− 0.004 0.010L +0.0125 0.0265L − 0.006 0.008L +0.025 0.039L +0.060 0.074L 1.2
0T +0.020 0.020L 1.8
1.4 1.8 1.4 2.8 1.8 2.8 2.8
0.08 0.16
− 0.029 0.029T − 0.0125 0.0125T − 0.031 0.031T 0
2.5 1.8 2.5 3 3.5
+0.1 0
+0.1 0
0.048L 0T
+0.078 +0.030
0.096L 0.030L
0 − 0.030
0.018L 0.030T
+0.0150 − 0.0150
0.033L 0.015T
0.006L 0.042T
+0.030 0
− 0.012 − 0.042
0.16 0.25
3
4 +0.2 0 3.3 +0.1 0 3.5 +0.1 0 2.8 +0.1 0 5 +0.2 0 3.3 +0.2 0 3.5 +0.1 0 2.8 +0.1 0 5 +0.2 0 3.3 +0.2 3.5 +0.1 0 2.8 +0.1 0
0 − 0.036
0.022L 0.036T
+0.0180 − 0.0180
0.040L 0.018T
0.007L 0.051T
+0.036 0
0.058L 0T
+0.098 +0.040
0.120L 0.040L
− 0.015 − 0.051
0.25 0.4
0.070L 0T
+0.120 +0.050
0.147L 0.050L
0 − 0.043
0.027L 0.043T
+0.0215 − 0.0215
0.0485L 0.0215T
0.009L 0.061T
+0.043 0
− 0.018 − 0.061
5.5
3.8 3.3 4.3 3.3 4.4
4 6 4 7
+0.2 0
+0.2 0
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