"Bob Kuykendall" wrote in message
...

How about you buy a full box of Grade 8 bolts, test half or quarter of
them to destruction in shear and tension, and then reject the box if
any fail below expected values. If they pass, test the rest to the
implementation design limits and then drill the heads on your drill
press using a carbide bit. That might work.

+++++++++++++++++++++++++++++++++++

I did that with my prop bolts. Better buy twice as many plus a dozen extra
carbide bits. Anybody wanna buy about six grade 8 prop bolts with busted
carbide bits imbedded in the hex heads?

Rich S.