What size drill do you use for a 5/16 X 36 tap to make a modified case? Thanks

If you look on your tap it might be on there,my taps have the proper drill size stamped on them

just checked my audels machinistsand tool makers handy book and there is no listing for a 5/16 x36 but there is a listing for a 5/16x32 that has a hole diam. of .282 and uses a 9/32 drill size,hope this helps

Larry B,

Please DO let me know how this project works out for you. I use the SP tool quite a lot and at the present time could use about four more new modified cases. I have also had the thought of just drilling and tapping my own cases,especially for the wildcats. Not a huge money saver but when you need it yesterday a huge TIME savings.

Frank N

frankn@montana.com

Larry,
I tried taking my O.A.L. gauge to a hardware store to see what would fit. The size tap you're looking for isn't correct according to what I was able to find and what my gunsmith told me. The tap seems to be a unique one. That makes sense for them. If it were easy to get a tap and make our own they would lose some profit.

Bob257

That tap IS 5/16 X 36tpi. They are available from any well stocked industrial supplier, or they are available directly from Stoney Point. They get about $15 for them. The industrial suppliers sell them for around $10.