Table 11. ANSI/ASME Standard Force and Shrink Fits ANSI/ASME B4.1-1967 (2009; out of print) Table 11. (Continued) 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
Inter ference a
Inter ference a
Inter ference a
Inter ference a
Hole H6
Hole H7
Shaft s6
Hole H7
Shaft t6
Hole H7
Shaft u6
Hole H8
Shaft x7
Shaft
Over
To
Values shown below are in thousandths of an inch
1.2 +1.0
+2.9
1.9 +1.6
+4.5 +3.5 +5.0 +4.0 +5.5 +4.5 +6.2 +5.0 +6.2 +5.0 +7.2 +6.0 +7.2 +6.0 +8.2 +7.0 +9.4 +8.0 +9.4 +8.0
3.4 +1.6
+6.0 +5.0 +6.0 +5.0 +7.0 +6.0 +8.2 +7.0 +8.2 +7.0 +9.2 +8.0
5.4 +1.6
+8.0 +7.0 +8.0 +7.0
7.5
+2.5
+11.6 +10.0 +13.6 +12.0 +13.6 +12.0 +15.8 +14.0 +17.8 +16.0 +17.8 +16.0 +20.0 +18.0 +22.0 +20.0 +24.2 +22.0 +27.2 +25.0 +30.5 +28.0 +32.5 +30.0
4.73- 5.52
2.9
0
+2.2 +3.2 +2.5 +3.5 +2.8 +3.8 +3.0 +4.3 +3.5 +4.3 +3.5 +4.9 +4.0 +4.9 +4.0 +5.5 +4.5 +6.1 +5.0 +7.0 +6.0 +7.0 +6.0
4.5
0
6.0
0
8.0
0
11.6
0
1.5 +1.0
2.4 +1.6
3.4 +1.6
5.4 +1.6
9.5
+2.5
5.52- 6.30
3.2
0
5.0
0
6.0
0
8.0
0
13.6
0
1.8 +1.0
2.9 +1.6
4.4 +1.6
6.4 +1.6
+9.0 +8.0 +10.2 +9.0 +11.2 +10.0 +13.2 +12.0 +13.2 +12.0 +15.2 +14.0 +17.4 +16.0 +19.4 +18.0 +21.6 +20.0 +23.6 +22.0
9.5
+2.5
6.30- 7.09
3.5
0
5.5
0
7.0
0
9.0
0
13.6 11.2 15.8 13.2 17.8 13.2 17.8 15.0 20.0 17.0 22.0 18.5 24.2 21.5 27.2 24.0 30.5 26.0 32.5
0
1.8 +1.2
3.2 +1.8
5.2 +1.8
7.2 +1.8
+2.8
7.09- 7.88
3.8
0
6.2
0
8.2
0
10.2
0
0
2.3 +1.2
3.2 +1.8
5.2 +1.8
8.2 +1.8
+2.8
7.88- 8.86
4.3
0
6.2
0
8.2
0
11.2
0
0
2.3 +1.2
4.2 +1.8
6.2 +1.8
10.2 +1.8
+2.8
8.86- 9.85
4.3
0
7.2
0
9.2
0
13.2
0
0
2.8 +1.2
4.0 +2.0
7.0 +2.0
+10.2 +9.0 +10.2 +9.0 +11.4 +10.0 +13.4 +12.0 +13.6 +12.0 +15.6 +14.0
10.0 +2.0
+3.0
9.85- 11.03
4.9
0
7.2
0
10.2
0
13.2
0
0
2.8 +1.2
5.0 +2.0
7.0 +2.0
12.0 +2.0
+3.0
11.03- 12.41
4.9
0
8.2
0
10.2
0
15.2
0
0
3.1 +1.4
5.8 +2.2
7.8 +2.2
13.8 +2.2
+3.5
12.41- 13.98
5.5
0
9.4
0
11.4
0
17.4
0
0
3.6 +1.4
5.8 +2.2
9.8 +2.2
15.8 +2.2
+3.5
13.98- 15.75
6.1
0
9.4
0
13.4
0
19.4
0
0
4.4 +1.6
6.5 +2.5
+10.6 +9.0 +11.6 +10.0
+9.5 +2.5
17.5 +2.5
+4.0
15.75- 17.72
7.0
0
10.6
0
13.6
0
21.6
0
0
4.4 +1.6
7.5 +2.5
11.5 +2.5
19.5 +2.5
+4.0
17.72- 19.69
7.0
0
11.6
0
15.6
0
23.6
0
0
a Pairs of values shown represent minimum and maximum amounts of interference resulting from application of standard tolerance limits. All data above heavy lines are in accordance with American-British-Canadian (ABC) agreements. Symbols H6, H7, s6, etc., are hole and shaft designations in the ABC system. Limits for sizes above 19.69 inches are not covered by ABC agreements but are given in the ANSI/ASME standard.
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