Posted by David Sherman on Saturday, July 15, 2006 at 11:49AM :
In Reply to: Re: In a pinch, probably. But I'd rather not risk it posted by MoparNorm on Saturday, July 15, 2006 at 10:56AM :
Does "grade" translate into a specific yield strength in PSI? Do they use different "grade" scales for chain, rebar, and bolts? The reason I ask is that I known chain is commonly sold as grade 60, 70, or 80, and bolts are sold as grade 2, 5, or 8. There's no way to tell from the "grade" numbers whether a given bolt is made of stronger steel than a given chain, for example. I would be surprised if a "grade 60" rebar was the same steel as a "grade 60" chain, since rebar has to be bendable for fabrication and can't be weakened by welding, and of course very cheap, whereas chain never has to bend once it's been forged and heat-treated, and pound-for-pound we're willing to pay a lot more for even a grade 60 binder chain than for rebar.
Do the chain, bolt, and rebar grades translate to specific ASTM numbers for types of steel, or do they represent their own specs for yield strength, elongation, flexural modulus, etc? I know this is way off the question of "how can I make a field-expedient shear pin that will protect my machine but will be strong enough to work?", but it's something I've always wondered about.
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