Metric Keys and Keyways Machinery's Handbook, 31st Edition
2541
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 Dimensions and Tolerances for Metric Square and Rectangular Parallel Keys ANSI/ASME B18.25.1M-1996 (Withdrawn) Width, b Thickness, h Chamfer or Radius, s Range of Lengths Basic Size (mm) Tolerance, h8 Basic Size Tolerance, Square, h8 Rectangular, h11 Minimum Maximum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 Rectangular Keys Table 1. (Continued) Dimensions and Tolerances for Metric Square and
0 0 0 0 − 0.090 − 0.110 − 0.075 − 0.110 − 0.090 − 0.110 0 − 0.090 0 0
8
56 220 63 260 70 280 80 320 90 360 100 400
20
12
6
22
14
0 − 0.033
0.60
0.80
9
25
14 10 16 11 18 12 20 22 25 28 32 32 36 40 45
28
0
32 36 40 45 50 56 63 70 80 90
− 0.110
0 − 0.039
0
1.00
1.20
− 0.110
0 − 0.046 0 − 0.054
0
1.60
2.00
− 0.160
2.50
3.00
100 50 a See Preferred Lengths and Tolerances starting on page 2539 for preferred maximum length of key. All dimensions in this standard are in millimeters (mm). Figures for Table 2 and Table 4 x
b t 2
Hub
t 1
h
d + t 2
Key
d – t 1
d
Shaft
x
r
Section x-x
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