Table 11. ANSI/ASME Standard Force and Shrink Fits ANSI/ASME B4.1-1967 (2009; out of print)
Class FN 1
Class FN 2
Class FN 3
Class FN 4
Class FN 5
Standard Tolerance Limits
Standard Tolerance Limits
Standard Tolerance Limits
Standard Tolerance Limits
Standard Tolerance Limits
Nominal Size Range, Inches
Inter ference a
Hole H6
Inter ference a
Hole H7
Shaft s6
Inter ference a
Hole H7
Shaft t6
Inter ference a
Hole H7
Shaft u6
Inter ference a
Hole H8
Shaft x7
Shaft
Over
To
Values shown below are in thousandths of an inch
0.05
+0.25
+0.5 +0.3 +0.6 +0.4
0.2
+0.4
+0.85 +0.6 +1.0 +0.7
0.3
+0.4
+0.95 0.3
+0.6
+1.3 +0.9 +1.7 +1.2 +2.0 +1.4 +2.3 +1.6 +2.5 +1.8 +3.0 +2.2 +3.3 +2.5 +4.0 +3.0 +5.0 +4.0 +6.2 +5.0 +7.2 +6.0 +8.4 +7.0 +9.4 +8.0
0- 0.12
0.5 0.1 0.6 0.1 0.1 0.8 0.2 0.9 0.2 1.1 0.3 1.2 0.3 1.3 0.4 1.4 0.6 1.8 0.7 1.9 0.9 2.4 1.1 2.6
0
0.85
0
0.95
0
+0.7 +1.2 +0.9 +1.6 +1.2 +1.8 +1.4 +1.8 +1.4 +2.1 +1.6 +2.3 +1.8 +3.1 +2.5 +3.4 +2.8 +4.2 +3.5 +4.7 +4.0 +5.9 +5.0 +6.9 +6.0
1.3 0.5 1.7 0.5 2.0 0.6 2.3 0.8 2.5 1.0 3.0 1.3 3.3 1.4 4.0 2.4 5.0 3.2 6.2 4.2 7.2 4.8 8.4 5.8 9.4
0
+0.3
0.2 1.0 0.4 1.4 0.5 1.6 0.5 1.6 0.6 1.9 0.6 1.9 0.8 2.4 0.8 2.4 0.8 2.7 1.0 2.9 1.4 3.7 1.6 3.9
+0.5
0.4 1.2 0.6 1.6 0.7 1.8 0.7 1.8 0.8 2.1 2.3 1.5 3.1 1.8 3.4 2.3 4.2 2.8 4.7 3.6 5.9 4.6 6.9
+0.5
+0.7
0.12- 0.24
0
0
0
0
+0.4
+0.75 +0.5 +0.8 +0.5
+0.6
+1.4 +1.0 +1.6 +1.2 +1.6 +1.2 +1.9 +1.4 +1.9 +1.4 +2.4 +1.8 +2.4 +1.8 +2.7 +2.0 +2.9 +2.2 +3.7 +2.8 +3.9 +3.0
+0.6
+0.9
0.24- 0.40
0.75
0
0
0
0
+0.4
+0.7
+0.7
+1.0
0.40- 0.56
0
0
0
0
+0.4
+0.9 +0.6 +1.1 +0.7 +1.2 +0.8 +1.3 +0.9 +1.4 +1.0 +1.8 +1.3 +1.9 +1.4 +2.4 +1.8 +2.6 +2.0
+0.7
+0.7
+1.0
0.56- 0.71
0
0
0
0
+0.5
+0.8
+0.8
+1.2
0.71- 0.95
0
0
0
0
+0.5
+0.8
0.8 2.1 1.0 2.6 1.2 2.8 1.3 3.2 1.8 3.7 2.1 4.4 2.6 4.9
+0.8
+2.1 +1.6 +2.6 +2.0 +2.8 +2.2 +3.2 +2.5 +3.7 +3.0 +4.4 +3.5 +4.9 +4.0
+1.0
+0.8
+1.2
0.95- 1.19
0
0
0
0
0
+0.6
+1.0
+1.0
+1.0
+1.6
1.19- 1.58
0
0
0
0
0
+0.6
+1.0
+1.0
+1.0
+1.6
1.58- 1.97
0
0
0
0
0
+0.7
+1.2
+1.2
+1.2
+1.8
1.97- 2.56
0
0
0
0
0
+0.7
+1.2
+1.2
+1.2
+1.8
2.56- 3.15
0
0
0
0
0
+0.9
+1.4
+1.4
+1.4
+2.2
3.15- 3.94
0
0
0
0
0
+0.9
+1.4
+1.4
+1.4
+2.2
3.94- 4.73
0
0
0
0
0
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