Metric Keys and Keyways Figures for Table 1 and Table 3 Machinery's Handbook, 31st Edition
2540
X
X
X
h
h
s
45
X L
X L
X
y
y
y
L
b / 2
b
b b / 2
y
Style C
y
Style B
Style A
y
y = sharp edges removed not to exceed s max
Table 1. Dimensions and Tolerances for Metric Square and Rectangular Parallel Keys ANSI/ASME B18.25.1M-1996 (Withdrawn) Width, b Thickness, h Chamfer or Radius, s Range of Lengths Basic Size (mm) Tolerance, h8 Basic Size
Tolerance, Square, h8 Rectangular, h11 Minimum Maximum From To a Square Keys
2 3 4 5 6 5 6 8
2 3 4 5 6 3 4 5 7 6 8 6 8 6 9 7 7
0 0
6 20 6 36 8 45 10 56 14 70 10 56 14 70 18 90
0 − 0.014 0 − 0.018
0.16
0.25
− 0.014 − 0.018
0.25
0.40
Rectangular Keys
0 0
0 − 0.018
− 0.060 − 0.075 0 − 0.090 − 0.075 0 − 0.090 − 0.075 0 0 0 − 0.090 − 0.075 0 − 0.090 0 − 0.110 0
0.25
0.40
0 − 0.022
10
0.60
22 110
12
28 110
0.40
14
36 160
0 − 0.027
0.60
16
45 180
10
18
50 200
11
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