Hardened ground production dowel pins have ground cylindrical sides at both ends making them rounded enough to be pressed into drive-fit holes. They are used in high production applications for doweling hardened tool and machine components, or to serve as a stop, guide or load-bearing pin. Made of carbon or alloy steels which are heat treat hardened by quenching in oil, these pins may be case hardened (surface hardness Rockwell C60 min and core hardness between C47-C58) or may be through hardened (Rockwell C50-C58) at manufacturer's option when parts are 1/8" diameter or smaller. The surface must always have a higher Rockwell reading than the core. Dowel pins are also available in non-magnetic 304 stainless steel or heat-treated 416 stainless steel. They are furnished plain, passivated, black oxide or cadmium plated.

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