Thread identification
| Requirement | Specify |
|---|---|
| Thread system | ISO metric, UNC, UNF or the project's actual thread specification |
| Diameter and pitch | Nominal diameter and pitch / threads per inch |
| Fit / tolerance | Required thread class or tolerance |
| Threaded length | Full thread, partial thread, or a dimensioned drawing |
| Mating component | Matching nut or tapped component requirements |
Avoid incomplete size references
A diameter such as M20 does not specify overall length, threaded length, finish or every mating-fit requirement. Include these details with the standard or drawing.
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