Technical Reference
286
Tables for Determining Metric Tolerances
Table 8: Tolerances for Inside Dimensions (Holes) Table 8 details tolerances for inside dimensions (holes) based relative to the tolerance symbol. This table works the same way as Table 6, but is pulled from a different source (ANSI standards) and details S7 and U7 fits. Pick the nominal size value that is closest to the desired nominal size to determine the required tolerance range relative to the chosen tolerance symbol.
[mm]
Hole: [mm]
HOLE BASIS FIT
Example:
Nominal size:
60
Size range to be used: ISO-Grade No.: Tolerance Symbol: Allowance for hole: Allowance for shaft: Desired Fit:
50 to 65
H7
+0.030 (0.030mm range)
IT7 (hole), IT6 (shaft)
60
-0
H7/k6
Shaft: [mm]
Locational Transition Fit
This Gives:
0.030mm 0.019mm
k6
+0.021 (0.019mm range)
60
+0.002
TOLERANCES FOR INSIDE DIMENSIONS (HOLES) (UNITS IN 0.001mm)
PICK CLOSEST VALUE TO DESIRED DIMENSION (UNITS IN mm)
PICK CLOSEST VALUE TO DESIRED DIMENSION (UNITS IN mm)
S7
U7 -18 -28 -18 -28 -18 -28 -18 -28 -18 -28 -18 -28 -19 -31 -19 -31 -19 -31 -22 -37 -22 -37 -26 -44 -26 -44 -33 -54
S7
U7 -40 -61 -40 -61 -51 -76 -61 -86
-14 -24 -14 -24 -14 -24 -14 -24 -14 -24 -14 -24 -15 -27 -15 -27 -15 -27 -17 -32 -17 -32 -21 -39 -21 -39 -27 -48
-27 -48 -27 -48 -34 -59 -34 -59 -42 -72 -48 -78 -58 -93
1
25
1.2
30
1.6
40
2
50
-76 -106 -91 -121 -111 -146 -131 -166 -175 -215 -219 -265 -267 -313 -330 -382 -414 -471 -517 -580
2.5
60
3
80
4
100
-66 -101 -85 -125 -105 -151 -123 -169 -150 -202 -187 -244 -229 -292
5
120
6
160
8
200
10
250
12
300
16
400
20
500
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