Reversible hard jaws from Dillon Manufacturing (Springfield, OH) are suitable for ID and OD workholding. The jaws are designed to hold a specific range of part sizes and are usually used for first operation workholding. They are available in serrated, Acme Key, square key, and tongue-and-groove styles to fit all brands of chucks. These single- or two-step jaws feature diamond-shaped serrations for gripping and parts locating. The hard jaws are manufactured of case-hardened 8620 steel that is coated with black oxide for corrosion resistance, and feature ground locating surfaces.
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