Drill size for M26 x 3 tap

Chippy

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H-M Supporter Gold Member
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I must have look at 50 different charts and still can't find it. I purchased it at MSC and they don't list the drill size either. Is there a formula to figure out the size?

Thanks in advance,
Brian
 
For metric, generally you can just subtract pitch from dia. 26-3= 23mm drill size.

Thank you, that's good to know. Finally got an answer from MSC technical department and that's exactly right, 23mm.

Brian
 
For metric, generally you can just subtract pitch from dia. 26-3= 23mm drill size.
This is also true for Imperial threads if you first convert tpi to thread pitch in inches. This will give an approximately 75% thread.
 
Here are the standard thread limits for a 6H6H/6h6h M26-3:
 

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