Northfield Precision Instrument Corporation, a leader in the design and manufacture of precision workholding chucks, presents their Modified Model 425 (.0001” T.I.R.) Air Chuck. The work piece is loaded into the chuck sprocket side down. The sprocket face is used for axial location. The locator provides radial (spring pins) to orient the work piece at a 45.648 degree angle. And hardened and ground top jaws to grip a 43.3mm internal diametertowards the top of the work piece.Northfield Precision designs and manufactures the world’s most accurate air and diaphragm chucks for any lathe, boring machine, grinder or VMC. Models include through-hole, high-speed and quick-change. Available in SAE or metric, in sizes from 3” (76mm) to 18” (457mm).Accuracies of 0.001” to 0.00001” (0.254m) guaranteed.