 |
Identifies a surface |
 |
Means that the indicated surface should
be parallel to surface A within 0.10 mm |
 |
Means the bore should be perpendicular
to surface A within 0.05 mm |
 |
Means that the diameter should be
concentric to diameter A within 0.03 mm |
 |
Specifies the diameter, in mm |
 |
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 |
0.7 mm |
| 5 mm |
0.8 mm |
| 6 mm |
1.0 mm |
| 8 mm |
1.25 mm |
|
 |
Indicates a surface finish of 1.6 micrometers, the same
as 63 micro inches. That's a good turned surface. |
 |
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. |
