Fits Si Tables Ansi b4.2-1978 r1994
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8/10/2019 Fits Si Tables Ansi b4.2-1978 r1994
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ALLOWANCES AND TOLERANCES 646
is given in Table 11.Normally, the hole basis system is preferred; however, when a com-mon shaft mates with several holes, the shaft basis system should be used.
The hole basis and shaft basis fits shownin Table 11arecombined with the first-choice
sizes shown in Table 10to form Tables 12, 13, 14,and 15, where specific limits as well asthe resultant fits are tabulated.
If the required size is not tabulated in Tables 12through 15then the preferred fit can becalculated from numerical values given in an appendix of ANSI B4.2-1978 (R1984). It isanticipated that other fit conditions may be necessary to meet special requirements, and apreferred fit can be loosened or tightened simply by selecting a standard tolerance zone asgiven in the Standard. Information on how to calculate limit dimensions, clearances, andinterferences, for nonpreferred fits and sizes can also be found in an appendix of this Stan-dard.
h6
Maximum
interference
Minimuminterference
Hole
tolerance
Basic
size
Shaft
tolerance
h6h6h6
H7 K7
h6h7
h9
h11
C11
Holetolerance
Minim
umtolerance
Shaft
tolerance
Maxim
umclearance
D9
F8
G7
h6h6
N7P7
S7
U7
Tran Inter
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