Machinery's Handbook, 31st Edition
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Interference Locational Fits Table 12. ANSI/ASME Standard Interference Locational Fits ANSI/ASME B4.1-1967 (2009; out of print)
Class LN 1
Class LN 2
Class LN 3
Standard Limits
Standard Limits
Standard Limits
Nominal Size Range, Inches
Limits of Inter- ference
Limits of Inter- ference
Limits of Inter- ference
Hole H6
Shaft n5
Hole H7
Shaft p6
Hole H7
Shaft r6
Over
To
Values shown below are given in thousandths of an inch
0
+0.25
+0.45 +0.25 +0.5 +0.3 +0.65 +0.4 +0.8 +0.4
0
+0.4
+0.65 +0.4 +0.8 +0.5
0.1
+0.4
+0.75 +0.5 +0.9 +0.6
0- 0.12
0.45
0
0.65
0
0.75
0
0
+0.3
0
+0.5
0.1 0.9 0.2 1.2 0.3 1.4 0.4 1.7 0.4 2.0 0.4 2.3 0.6 2.9 0.9 3.5 1.2 4.2 1.5 4.7 2.3 5.9 2.5 6.6
+0.5
0.12- 0.24
0.5
0
0.8
0
0
0
+0.4
0
+0.6
+1.0 +0.6 +1.1 +0.7 +1.3 +0.8 +1.6 +1.0 +2.1 +1.4 +2.5 +1.6 +2.8 +1.8 +3.2 +2.0 +3.4 +2.2 +3.9 +2.5 +4.4 +2.8
+0.6
+1.2 +0.8 +1.4 +1.0 +1.7 +1.2 +2.0 +1.4 +2.3 +1.6 +2.9 +2.0 +3.5 +2.5 +4.2 +3.0 +4.7 +3.5 +5.9 +4.5 +6.6
0.24- 0.40
0.65
0
1.0
0
0
0
+0.4
0
+0.7
+0.7
0.40- 0.71
0.8
0
1.1
0
0
0
+0.5
+1.0 +0.5 +1.1 +0.6 +1.3 +0.8 +1.6 +1.0 +1.9 +1.2 +2.2 +1.4 +2.3 +1.4 +2.6 +1.6 +2.8 +1.8
0
+0.8
+0.8
0.71- 1.19
1.0
0
1.3
0
0
0
+0.6
0
+1.0
+1.0
1.19- 1.97
1.1 0.1 1.3 0.1 1.6 0.2 1.9 0.2 2.2 0.2 2.3 0.2 2.6 0.2 2.8
0
1.6 0.2 2.1 0.2 2.5 0.2 2.8 0.2 3.2 0.2 3.4 0.3 3.9 0.3 4.4
0
0
+0.7
+1.2
+1.2
1.97- 3.15
0
0
0
+0.9
+1.4
+1.4
3.15- 4.73
0
0
0
+1.0
+1.6
+1.6
4.73- 7.09
0
0
0
+1.2
+1.8
+1.8
7.09- 9.85
0
0
0
+1.2
+2.0
+2.0
9.85- 12.41
0
0
0
+1.4
+2.2
+2.2
12.41- 15.75
0
0
0
+1.6
+2.5
+2.5
15.75- 19.69
0 +5.0 All data in this table are in accordance with American-British-Canadian (ABC) agreements. Limits for sizes above 19.69 inches are not covered by ABC agreements but are given in the ANSI/ASME Standard. Symbols H7, p6, etc., are hole and shaft designations in the ABC system. Tolerance limits given in body of table are added or subtracted to basic size (as indicated by + or – sign) to obtain maximum and minimum sizes of mating parts. ANSI/ASME Preferred Metric Limits and Fits 0 0 This standard ANSI/ASME B4.2-1978 (R2009) describes the ISO system of metric limits and fits for mating parts as approved for general engineering usage in the United States. It establishes 1) the designation symbols used to define dimensional limits on draw - ings, material stock, related tools, gages, etc.; 2) the preferred basic sizes (first and second choices); 3) the preferred tolerance zones (first, second, and third choices); 4) the preferred limits and fits for sizes (first choice only) up to and including 500 millimeters; and 5) the definitions of related terms. The general terms “hole” and “shaft” can also be taken to refer to the space containing or contained by two parallel faces of any part, such as the width of a slot or the thickness of a key. Definitions.— The most important terms relating to limits and fits are shown in Fig. 1 and are defined as follows: Basic Size: The size to which limits of deviation are assigned. The basic size is the same for both members of a fit. For example, it is designated by the numbers 40 in 40H7. Deviation: The algebraic difference between a size and the corresponding basic size.
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