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40HRC seems to be good idea, hopefully i don't need any special knurling tools and kits for these. Getting pre-hardened seems to be better solution than doing them after will be much costly compare to get it hardened straight from the mill.

ah i guess i have no choice but to do through hardening, which seems way too costly? How does rogue fitness and kabuki strength does, there bars don't cost a lot and other brands swell. Do they import from china for large batch manufacturing? Can i buy the bars at 35-40HRC and do the knurling...

No it's not possible to use other than knurl, knurl is the process of the olympic barbell. Can i do induction hardness or gas nitriding to increase UTS?

That is my first priority, but don’t have large enough furnaces for 7ft also the heat treatment won’t give assurance that it will be 100% straight. Also the charges of full hardness exceed the cost.

to avoid permanent deformation at heavier weights the bar deforms, barbell manufacturers increase UTS to increase its strength and longevity of the bar.

Hello, I'm looking to build olympic barbell, i have purchased 4140 grade in annealed form which typical hardness is around 20HRC. I have done knurling on the shaft but i need to increase the tensile strength. the typical tempering and hardness seems to be very expensive to meet the tensile...