Originally Posted by Clay Target Guy
I have a Stoney Point and it is 5/16-36 as well.
I bought a tap from MSC several years ago and it has served me well. Seems a little pricey but it does not take long to pay for itself.
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you are correct, and I stand corrected. I checked the tool the other night. Where I got the 5/16-27TPI in my head I don't know. Still the extra fine thread for a .312" diameter is 32tpi, so that doesn't make much sense as well. They should have made it M8-32tpi, which is the standard Timken bearing nut thread. 8mm is .315" diameter, and 32 threads per inch is standard. Next one finer is 40tpi, and that's used on the 5/16" diameter. 36 TPI just doesn't make much sense at all, and it just slightly short of the standard 1.0 metric thread. surprised that somebody like Redding hasn't jumped on this one.