Table 4. Keyway Dimensions and Tolerances for Metric Square and Rectangular Parallel Keys ANSI/ASME B18.25.3M-2003 (R2008) Width Tolerances and Deviations Greater than Basic Size
Keyway Width
Keyway Depth
Tolerance and Resulting Fit a
Shaft, t 1
Hub, t 2
Radius, r
Normal Fit
Close Fit
Free Fit
Shaft
Hub
Shaft and Hub
Shaft
Hub
Key Size, b × h
Nom- inal
Nom- inal
Toler ance
Toler ance Fit
Nomi nal
Toler ance Max.
Toler ance Fit
Toler ance
Toler ance
Toler ance
Fit
Fit
Fit
2 +0.040 0.040L +0.050 0.050L +0.034 0.034L +0.066 0.066L 0T 3 +0.010 0.030T +0.025 0.015T − 0.008 0.032T +0.040
+0.086 0.086L 1.2 +0.060 0.020L 1.8
1
2 × 2 3 × 3 4 × 4 5 × 3 5 × 5 6 × 4 6 × 6 8 × 5 8 × 7
1.4 1.8 2.8 1.8 2.8 2.8
0.16
4 5
2.5
1.8 +0.1
1.4 +0.1
0.075L 0T
5 +0.045 0.045L +0.060 0.060L +0.035 0.035L +0.075 6 +0.015 0.030T +0.015 0.015T − 0.005 0.040T +0.045
+0.105 0.105L 3 +0.075 0.030L 2.5
0
0
6 8 8
3.5
0.25
3 4
+0.2 0
3.3 +0.2 0 2.8 +0.1 0 3.3 +0.2 0 2.8 +0.1 0 3.3 +0.2 0 2.8 +0.1 0 3.8 +0.2 0
+0.055 +0.015
0.055L 0.035T
+0.075 +0.035
0.075L 0.015T
+0.040 0.000
0.040L 0.050T
+0.090 +0.050
0.090L 0T
+0.130 +0.090
0.130L 0.040L
10 10 12 12 14 14
3.5 +0.1 0
10 × 6 10 × 8 12 × 6 12 × 8 14 × 6 14 × 9
+0.2 0
5
3.5 +0.1 0
0.6
+0.2 0
5
0.080L 0.045T
+0.095 +0.055
0.095L 0.020T
0.055L 0.060T
+0.135 +0.075
0.135L 0T
+0.185 +0.125
0.185L 0.050L
+0.080 − 0.030
+0.055 − 0.015
3.5 +0.1 0 5.5 +0.2 0
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