Reversible hard jaws from Dillon Manufacturing, Inc., which are suitable for ID and OD workholding, can decrease the time and cost of tool set-ups, yet still accurately grip and locate work pieces. 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 which provide accurate gripping and parts locating.

The hard jaws are manufactured of 8620 steel, case hardened, with ground locating surfaces and black oxide coated for corrosion resistance. Dillon also offers custom made special or modified hard jaws with industry-best turnaround times.