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PostPosted: Wed Apr 21, 2021 11:08 pm 
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Am I correct in thinking a 14.5mm drill would be OK to use to tap a 5/8x18 tpi thread. And a 15mm drill would work for 5/8x24 tpi thread.

(tpi = teeth per inch)


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PostPosted: Thu Apr 22, 2021 8:23 am 
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Location: West Sussex, UK
Home club or Range: Chichester Rifle and Pistol Club
Yes 14.5mm is correct for 5/8-18. 5/8-24 should be 14.8mm. 15mm will take you down to about 60% thread which may work for you or may not. Extra fine threads obviously don't take much to lose a lot of thread.


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PostPosted: Thu Apr 22, 2021 8:43 am 
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I have an easy to use app on my phone that gives all the info for metric and imperial- "machine screw drill-n-tap by JimsJump"

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