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GAGING TIPS
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Cylindrical Gage Tolerances
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| Size Range In |
Size Range MM |
XX Tolerance |
X Tolerance |
Y Tolerance |
Z Tolerance |
ZZ Tolerance |
| Above |
To and Including |
Above |
To and Including |
Inch |
Metric |
Inch |
Metric |
Inch |
Metric |
Inch |
Metric |
Inch |
Metric |
| .016 |
.825 |
.40 |
20.95 |
.00002 |
.00051 |
.00004 |
.001 |
00007 |
.0018 |
.0001 |
.0025 |
.0002 |
.0051 |
| .825 |
1.510 |
20.25 |
38.35 |
.00003 |
.00076 |
.00006 |
.0015 |
.00009 |
.0023 |
.00012 |
.003 |
.00024 |
.0061 |
| 1.51 |
2.51 |
38.35 |
63.75 |
.00004 |
.001 |
.00008 |
.002 |
.00012 |
.003 |
.00016 |
.0041 |
.00032 |
.0081 |
| 2.51 |
4.51 |
63.75 |
114.55 |
.00005 |
.0013 |
.0001 |
.0025 |
.00015 |
.0038 |
.0002 |
.0051 |
.0004 |
.010 |
| 4.51 |
6.51 |
114.55 |
165.35 |
.000065 |
.0017 |
.00013 |
.0033 |
.00019 |
.0048 |
.00025 |
.0064 |
.0005 |
.013 |
| 6.51 |
9.01 |
165.35 |
228.85 |
.00008 |
.002 |
.00016 |
.0041 |
.00024 |
.0061 |
.00032 |
.0081 |
.00064 |
.017 |
| 9.01 |
12.01 |
228.85 |
305.05 |
.0001 |
.0025 |
.0002 |
.0051 |
.0003 |
.0076 |
.0004 |
.010 |
.0008 |
.020 |
It is a good idea to use gages that are accurate to 10% of the manufacturing tolerance. Typically, 1/2 of the 10% is applied to the Go gage, the other 1/2 is applied to the NoGo gage.
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Direction of Tolerances
|
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Cylindrical Rings:
|
Go: Minus Tolerance |
| NoGo: Plus Tolerance |
| Mean Master: Bilateral (1/2 Plus-1/2 Minus) |
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Cylindrical Plugs:
|
Go: Plus Tolerance |
| NoGo: Minus Tolerance |
| Mean Master: Bilateral (1/2 Plus-1/2 Minus) |
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