5C Collet Chuck,5C Holder W.Semi-finished Adapter 1-3\/4" x 8 Thread for Lathe Chuck Tool Holder，Accuracy: .0004-.0006 TIR.

Chuck Outside Diameter:5"; Plain Back,Recessed 3.740" x 0.184" Deep; | 3 Mounting hole on Chuck:Diameter 0.35", Bolt Patten 4.25"; 3 Mounting screw hole on back plate: M8 and already drilled and tapped; | Comes with a semi-finished back plate (1-3/4" x 8 Threaded) exactly as our picture show . The mounting holes are already drilled and tapped.Customer just need to use their own lathe to lightly surface the front surface and turn very little on the registration boss according to the actual recess of the chuck, then bolt the two parts together with the included bolts. This work just like assembly a 3-jaw chuck with a new back plate. As this final assembly work is done on your own, final use lathe, usually can reach the highest TIR accuracy; | Our 3 Pinion Gears Operated Design is not only easy the Open and Close, but also assures higher accuracy than 2 Pinion Gears（ in most of the market）； | Max.RPM 6000; Accuracy: 0.0006 TIR; Can Use Any Size 5C Collet From 1/16 through 1-1/8"; | We are manufacturer,for various specifications 5c collet chuck,we have over 20 years manufacturing experience.