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Symbols Used on Our Drawings
These symbols are used on the Mechanical Models engine drawings as well as on many other drawings.
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Identifies a surface |
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Means that the indicated surface should be parallel to
surface A within 0.10 mm |
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Means the bore should be perpendicular to surface A within
0.05 mm |
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Means that the diameter should be concentric to diameter
A within 0.03 mm |
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Specifies the diameter, in mm |
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Specifies a thread. M3 means a 3 mm standard thread. 7H
means a standard class of fit (that is, make it fit). The pitch for standard
metric threads are as follows:
| Diameter |
|
Pitch |
| 3 mm |
|
0.5 mm |
| 4 mm |
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0.7 mm |
| 5 mm |
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0.8 mm |
| 6 mm |
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1.0 mm |
| 8 mm |
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1.25 mm |
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Indicates a surface finish of 1.6 micrometers, the same
as 63 micro inches. That's a good turned surface. |
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Indicates surface finish of 1.6 micrometers. The circle
indicates that you should not remove any material, simply use the size and
finish that is provided. |
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