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AR15.COM
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2/7/2007 7:41:53 AM EDT
I'm making a custom muzzle brake for the funzies of it and I obviously know my thread count but where can I find the drill bit size for my pilot hole?  This is for my 6.8 spc barrel 5/8"-24.  Thanks

*Ooh forgot to add I'm thinking a 39/64 would be sufficient but I'd prefer to hear from some machinist who would have the resources on hand
2/7/2007 7:51:22 AM EDT
[#1]
Here is a reference chart.


efxguy
2/7/2007 6:16:44 PM EDT
[#2]
Looks like 37/64" or 19/32" from the chart.
I always bore the hole with a boring bar after drilling a 9/16" hole...
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