Northfield Precision Instrument Corporation, a designer and manufacturer of precision workholding chucks, recently introdcued the 5C Collet Chuck. This chuck is interchangeable with their standard four inch chucks. The 5C Collet Chuck is air actuated, uses Northfield's standard air feed tubes (wet or dry) and has the same bolt pattern as the standard four inch models. The components are hardened and ground to 58/63 R.C. and all diameters ground within 1/10,000 T.I.R. The chucks use standard 5C collets and can run at speeds in excess of 8,000 rpm. Northfield Precision designs and manufactures air 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" (76 mm) to 18" (457 mm). Accuracies of 0.001" to 0.00001" (0.254 m) guaranteed. Custom workholding chucks and jaws are available and free engineering assistance is offered.