What is the thread Tap(s), "2 of them" for the iron site mounting holes and the scope base mounting holes on a Traditions Vortek Strikerfire LDR muzzleloader?

Question

Aaron S. · Answer

1-1/2 threads lead-in I believe

Scott M. · Answer

These are 8-40 I believe.

Qwenton G. · Answer

I would contact traditions to verify.

Craig P. · Answer

If you mean #2 threads, they are 56TPI UNC thread form and the recommended drilling size is 1.85mm. Sutton tools has #2 taps available in spiral flute.

Willard J. · Answer

99% of scope mount bases will either be #8-40tpi, or #6-48tpi, the other 1% would be "metric".

James C. · Answer

Drill size for tap is #29 for 8-40 tap. That's 75% cut. Use tap magic and go slow. If it get snug, back out, clean tap continue. Small threads you only get one shot. Be tedious.

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