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What size tapping drill
| Eric Cox | 01/06/2012 16:10:36 |
 557 forum posts 38 photos | What is the tapping size for ME thread 1/2" x 32 tpi. |
| Alain Faget | 01/06/2012 16:17:58 |
| 8 forum posts | Eric Drill 12mm for this 1/2 32 tpi Alain |
| NJH | 01/06/2012 16:21:06 |
 2314 forum posts 139 photos | Harold's Metalwork Data Book and Tubal Cain's Model Engineer's Handbook both show 12mm N |
| Eric Cox | 01/06/2012 16:37:13 |
557 forum posts 38 photos | Cheers, I saw it as 12mm in Harold's Metalwork Data Book but thought 12mm was a bit big for a 1/2" thread. |
| _Paul_ | 01/06/2012 18:42:18 |
 543 forum posts 31 photos | It might seem big but 32TPI is quite a shallow thread. Paul |
| Robert Dodds | 01/06/2012 22:37:37 |
| 324 forum posts 63 photos | Eric, Just be sure your 12mm drill doesn't cut oversize! Bob D |
| Russell Eberhardt | 02/06/2012 15:25:24 |
 2785 forum posts 87 photos | Just be sure your 12mm drill doesn't cut oversize! Start with a small drill and open up in stages to 11 mm before finishing with your 12 mm drill. The hole diameter will be accurate enough then. Russell. |
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