Thread tap question please

Sal Lubrano

Active Member
Joined
Apr 26, 2002
Does anyone know what hsg means? (High speed ground) How is that different from hss (high speed steel). Need to purchase a plug tap m6 *1. I know there is carbon steel, hss but how does hsg compare?
 
From what I can find is that HSG is ground " to a precision tolerance under closely controlled manufacturing processes and are guaranteed for accuracy " . I looks like both are made from HSS , just one is ground for more exacting tolerances .
 
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