SHARS 10 3 Jaw Self-Centering D1-6 Cam-Lock Mounting Lathe Chuck. 0039 TIR Runout Certificate. Each high quality chuck comes with a certification that documents TIR. Center hole: 2.75. Spindle Nose Dia: 4.19. Max speed RPM 1600. Input Torque: 320 Nm. Chuck includes one set of reversible jaws. Clamping Range A-A1: 0.236-4.331. Jamming Range B-B1: 3.150-9.843. Clamping Range C-C1: 3.543-9.843. Three pinion design with each pinion ground and hardened to HRC 43. Two piece jaw design with a master jaw and a top reversible jaw in. American Standard tongue and groove. Both side of jaw teeth and guides are ground and hardened to HRC 58-62. Each set of jaws are serialized in their own set. A serialized set of jaws are then finished, ground, and lapped on their designated chuck body which will be the same chuck body on the final assembly to achieve a greater accuracy. Before assembling the jaw to its designated chuck body, the jaw’s finish machining are performed on a closed tolerance state of the art CNC machine from Japan. Scroll plate’s thread flank are ground on both side to achieve a tighter contact with the master jaw. Each chuck has gone through rigorous accuracy and repeatability inspection with clamping and jamming multiple random testing rods or rings. “D Type” and Camlock.