Metric Keys and Keyways Machinery's Handbook, 31st Edition
2545
Table 3. Dimensions and Tolerances for Metric Square and Rectangular Parallel Keys ANSI/ASME B18.25.3M-2003 Width Tolerances and Deviations Greater than Basic Size Width, b Thickness, h Chamfer or Radius, s Table 3. (Continued) Dimensions and Tolerances for Metric Square and Rectangular Parallel Keys ANSI/ASME B18.25.3M-2003 Width Tolerances and Deviations Greater than Basic Size
Range of Lengths From To a
Basic Size Tolerance Basic Size Tolerance Min.
Max.
+0.175 − 0.000 +0.210 − 0.000 +0.210 − 0.000 +0.190 − 0.000 +0.210 − 0.000
6
70 80 90
280 320 360 400
22
14
9
0.60
0.80
+0.050 − 0.033
25
14 10 16 11 18 12 20 22 25 28 32 32 36 40 45
100
28
32
+0.280 − 0.000
36 40 45 50 56 63 70 80 90
+0.090 − 0.000
1.00
1.20
1.60
2.00
+0.125 − 0.000 +0.135 − 0.000
+0.310 − 0.000
2.50
3.00
100 50 a See Preferred Lengths and Tolerances on page 2545 for preferred maximum length of key ex- cept basic width of 2 mm. Comparison with ISO R773-1969 and 2491-1974.— This standard has greater tolerances than ISO Standards R773-1969 and 2491-1974. Product manufactured to this standard is not interchangeable dimensionally with product manufactured to the ISO standards nor is product manufactured to the ISO standards dimensionally interchangeable with product manufactured to this standard. ISO standards do not include hardened keys. Preferred Lengths and Tolerances.— Preferred lengths and tolerances of square and rectangular keys are shown below. Tolerances are JS 16 from ANSI/ASME B4.2. To mini- mize problems due to lack of straightness, key length should be less than 10 times the key width. Length ± Tolerances Length ± Tolerances 6 0.375 90, 100, 110 1.10 8, 10 0.45 125, 140, 160, 180 1.25 12, 14, 16, 18 0.55 200, 220, 250 1.45 20, 22, 25, 28 0.65 280 1.60 32, 36, 45, 50 0.80 320, 360, 400 1.80 56, 63, 70, 80 0.95
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