RGG Bolt plug

I\'m working on drawing 48-20 detail G, I drilled and tapped a piece of .500 CRS held in a 5C collet and put a healthy champfer  in to deal with the rolled threads running out near the head.

I screwed in the SHCS, and turned down the diameter with one pass.  1500 rpm, .002 feed 0.055 doc and got a nice finish.   Slow sucked.  I\'ll have to scotcbrite a couple that I got a poor finish on while I was figuring out how to make these.

I have to put the .218 dia hole in.  Can HSS handle it or should I buy a carbide drill bit?  My other thought is to take my mapp gas torch to the fastener and take it to red and let it air cool.

Ideas welcome.

Clutch

[cutter]

I use cobalt drills for almost everything
Good Luck

HSS worked better than I expected.  I didn\'t have a cobalt drill available.  To make it more do-able, I predrilled the bolts with a small diameter carbide drill I had laying around to clear the drill web.  The drill edge failed just breaking through the the last of ten bolts.

The threaded portion is still 3/8\", I haven\'t shortened them yet so the drill had extra work to do.  

Clutch