Table 8a. American National Standard Running and Sliding Fits ANSI/ASME B4.1-1967 (2009; out of print)
Class RC 1
Class RC 2
Class RC 3
Class RC 4
Standard Tolerance Limits
Standard Tolerance Limits
Standard Tolerance Limits
Standard Tolerance Limits
Nominal Size Range, Inches
Hole H5
Shaft g4
Hole H6
Shaft g5
Hole H7
Shaft f6
Hole H8
Shaft f7
Clearance a
Clearance a
Clearance a
Clearance a
Over
To
Values shown below are in thousandths of an inch
0.1
+0.2
0.1
+0.25
0.3
+0.4
0.3 1.3 0.4 1.6 0.5 2.0 0.6 2.3 0.8 2.8 1.0 3.6 1.2 4.2 1.4 5.0 1.6 5.7 2.0 6.6 2.5 7.5 3.0 8.7 4.0
+0.6
–0.1 –0.25 –0.15 –0.3 –0.2 –0.35 –0.25 –0.45 –0.3 –0.55 –0.4 –0.7
–0.1 –0.3
–0.3 –0.55 –0.4 –0.7
–0.3 –0.7 –0.4 –0.9 –0.5 –1.1 –0.6 –1.3 –0.8 –1.6 –1.0 –2.0 –1.2 –2.4 –1.4 –2.8 –1.6 –3.2 –2.0 –3.8 –2.5 –4.5 –3.0 –5.2 –4.0 –6.5
0 - 0.12
0.45 0.15
0
0.55 0.15 0.65 0.85 0.25 0.95 0.2
0
0.95
0
0
+0.2
+0.3
0.4 1.2 0.5 1.5 0.6 1.7 0.8 2.1 1.0 2.6 1.2 3.1 1.4 3.7 1.6 4.2 2.0 5.0 2.5 5.7 3.0 6.6 4.0 8.1
+0.5
+0.7
–0.15 –0.35 –0.2 –0.45 –0.25 –0.55 –0.3 –0.7
0.12 - 0.24
0.5 0.2 0.6
0
0
0
0
+0.25
+0.4
+0.6
+0.9
–0.5 –0.9 –0.6 –1.0 –0.8 –1.3 –1.0 –1.6 –1.2 –1.9 –1.4 –2.3 –1.6 –2.6 –2.0 –3.2 –2.5 –3.7 –3.0 –4.4 –4.0 –5.6
0.24 - 0.40
0
0
0
0
0.25 0.75
+0.3
+0.4
+0.7
+1.0
0.40 - 0.71
0
0
0
0
0.3
+0.4
0.3 1.2 0.4 1.4 0.4 1.6 0.5 2.0 0.6 2.3 0.6 2.6 0.8 2.9 1.0 3.4 1.2 3.8
+0.5
+0.8
+1.2
0.71 - 1.19
0.95
0
0
0
0
0.4 1.1 0.4 1.2 0.5 1.5 0.6 1.8 0.6 2.0 0.8 2.3 1.0 2.7 1.2 3.0
+0.4
+0.6
+1.0
+1.6
–0.4 –0.8 –0.4 –0.9 –0.5 –1.1 –0.6 –1.3 –0.6 –1.4 –0.8 –1.7 –1.0 –2.0 –1.2 –2.2
1.19 - 1.97
0
0
0
0
+0.5
+0.7
+1.2
+1.8
–0.4 –0.7 –0.5 –0.9 –0.6 –1.1 –0.6 –1.2 –0.8 –1.4 –1.0 –1.7 –1.2 –2.0
1.97 - 3.15
0
0
0
0
+0.6
+0.9
+1.4
+2.2
3.15 - 4.73
0
0
0
0
+0.7
+1.0
+1.6
+2.5
4.73 - 7.09
0
0
0
0
+0.8
+1.2
+1.8
+2.8
7.09 - 9.85
0
0
0
0
+0.9
+1.2
+2.0
+3.0
9.85 - 12.41
0
0
0
0
+1.0
+1.4
+2.2
+3.5
12.41 - 15.75
0
0
0
0
+1.0
+1.6
+2.5
+4.0
15.75 - 19.69
0
0
0
10.5
0
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