A36 hot rolled for tool holders?

I buy a lot of stock from:

www.speedymetals.com

I've used a lot of 1045 for non-critical stuff. Better than 1018. For anything requiring real strength I go with 1144 stressproof at a minimum. Use a lot of that. I've also used 4140 (annealed and heat treated). You can get both from speedy metals. Look under their alloy section.
 
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