Proper tempering to a needed hardness takes time, and that cost money.
You can heat up a grade 5 bolt or any steel for that matter to red hot and then quench it in oil, but the level of hardening will be all over the place!
There is a exact temp needed by the level of redness and then depending on what you want the steel my need to be air cooled breifly before quenching.
Oil drive shaft wise the lesser of two evils for me is a slightly soft one that will twist some before it snaps.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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