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== Machine Screw Diameters == | == Machine Screw Diameters == | ||
Revision as of 23:20, 16 June 2014
Standard Screw Threads and Tap Drill Sizes
| No. | Thread | Tap Drill | Clear Drill |
|---|---|---|---|
| 0 | 80 | 56 | 52 |
| 1 | 72 | 53 | 48 |
| 2 | 56 | 49 | 43 |
| 3 | 48 | 47 | 39 |
| 4 | 40 | 44 | 32 |
| 5 | 40 | 39 | 30 |
| 6 | 32 | 36 | 28 |
| 8 | 36 | 29 | 19 |
| 10 | 32 | 21 | 11 |
| 12 | 24 | 16 | 2 |
Machine Screw Diameters
The Miniature Locomotive, July-August 1954
Machine screws are numbered as distinct from Cap Screws, Bolts, etc, and range usually from #0 to #12. A convenient method of finding the exact diameter if a table is not handy is as follows:
- Multiply the number of 13 and add sixty thousandths. The answer will be thousandths.
Examples:
- #0 -- 0 multiplied by 13 equals 0, plus 0.060 equals 0.060
- #3 -- 3 multiplied by 13 equals 39, plus 0.060 equals 0.099
- #5 -- 5 multiplied by 13 equals 65, plus 0.060 equals 0.125
- #10 -- 10 multiplied by 13 equals 0.130, plus 0.060 equals 0.190