Quote:
Originally Posted by Nailhead
It's part of a cobalt steel bit set I bought at Fastenal several years ago, which has always performed really well drilling steel. I had started with a 9/64 for quicker drilling, and because it looks to be the size of the screw minus the thread depth, if that makes any sense.
I've already got a #7/1/4-20 combo that I used for grounding equipment in my previous life, so I got that going for me.
Thank you very much for the write-up-- I really do appreciate it. Tonight, I'm going to forget about the little parasite, and tomorrow (or whenever), I'll decide whether I want to devote further time/energy/money/garage space to it. There's a National Guard training camp in eastern Wyoming that loves stuff like this for their gunnery range, and that continues to be tempting.
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9/64 is .1406 It's on the small side for difficult materials. ( as in too easy to quickly lose an edge ) The Fastenal drill set should be a decent one if it's a Made in the USA set.