Table 9a. American National Standard Clearance Locational Fits ANSI/ASME B4.1-1967 (2009; out of print)
Class LC 1
Class LC 2
Class LC 3
Class LC 4
Class LC 5
Standard Tolerance Limits
Standard Tolerance Limits
Standard Tolerance Limits
Standard Tolerance Limits
Standard Tolerance Limits
Nominal Size Range, Inches
Clear ance a
Clear ance a
Clear ance a
Clear ance a
Clear ance a
Hole H6
Shaft h5
Hole H7
Shaft h6
Hole H8
Shaft h7
Hole H10
Shaft h9
Hole H7
Shaft g6
Over
To
Values shown below are in thousandths of an inch
0
+0.25
0
0
+0.4
0
0
+0.6
0
0
+1.6
0
0.1
+0.4
–0.1 –0.35 –0.15 –0.45 –0.2 –0.6 –0.25 –0.65
0- 0.12
0.45
0
0.65
0
0
2.6
0
0.75 0.15 0.95
0
–0.2
–0.25 1
–0.4
–1.0
0
+0.3
0
0
+0.5
0
0
+0.7
0
0
+1.8
0
+0.5
0.12- 0.24
0.5
0
0.8
0
1.2
0
3.0
0
0
–0.2
–0.3
–0.5
–1.2
0
+0.4
0
0
+0.6
0
0
+0.9
0
0
+2.2
0
0.2 1.2
+0.6
0.24- 0.40
0.65
0
1.0
0
1.5
0
3.6
0
0
–0.25
–0.4
–0.6
–1.4
0
+0.4
0
0
+0.7
0
0
+1.0
0
0
+2.8
0
0.25 1.35
+0.7
0.40- 0.71
0.7
0
1.1
0
1.7
0
4.4
0
0
–0.3
–0.4
–0.7
–1.6
0
+0.5
0
0
+0.8
0
0 2 0 0 3 0
+1.2
0
0
+3.5
0
0.3 1.6 0.4 2.0 0.4 2.3 0.5 2.8 0.6 3.2 0.6 3.6 0.7 3.9 0.7 4.3 0.8 4.9
+0.8
–0.3 –0.8 –0.4 –1.0 –0.4 –1.1 –0.5 –1.4 –0.6 –1.6 –0.6 –1.8 –0.7 –1.9 –0.7 –2.1 –0.8
0.71- 1.19
0.9
0
1.3
0
0
5.5
0
0
–0.4
–0.5
–0.8
–2.0
0
+0.6
0
0
+1.0
0
+1.6
0
0
+4.0
0
+1.0
1.19- 1.97
1.0
0
1.6
0
2.6
0
6.5
0
0
–0.4
–0.6
–1
–2.5
0
+0.7
0
0
+1.2
0
+1.8
0
0
+4.5
0
+1.2
1.97- 3.15
1.2
0
1.9
0
0
7.5
0
0
–0.5
–0.7
–1.2
–3
0
+0.9
0
0
+1.4
0
+2.2
0
0
+5.0
0
+1.4
3.15- 4.73
1.5
0
2.3
0
3.6
0
8.5
0
0
–0.6
–0.9
–1.4
–3.5
0
+1.0
0
0
+1.6
0
0
+2.5
0
0
+6.0
0
+1.6
4.73- 7.09
1.7
0
2.6
0
4.1
0
10.0
0
0
–0.7
–1.0
–1.6
–4
0
+1.2
0
0
+1.8
0
0
+2.8
0
0
+7.0
0
+1.8
7.09- 9.85
2.0
0
3.0
0
4.6
0
11.5
0
0
–0.8
–1.2
–1.8
–4.5
0
+1.2
0
0
+2.0
0
0 5 0
+3.0
0
0
+8.0
0
+2.0
9.85- 12.41
2.1
0
3.2
0
0
13.0
0
0
–0.9
–1.2
–2.0
–5
0
+1.4
0
0
+2.2
0
+3.5
0
0
+9.0
0
+2.2
12.41- 15.75
2.4
0
3.6
0
5.7
0
15.0
0
0
–1.0
–1.4
–2.2
–6
0
+1.6
0
0
+2.5
0
0
+4
0
0
+10.0
0
+2.5
15.75- 19.69
2.6
0
4.1
0
6.5
0
16.0
0
0
–1.0 –2.4 Tolerance limits given in body of Table 9a and Table 9b are added or subtracted to basic size (as indicated by + or – sign) to obtain maximum and minimum sizes of mating parts. 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 ABC system. –1.6 –2.5 –6
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