This 4 inch 3-Jaw self-centering lathe chuck includes a chuck key, inside and outside jaws, and mounting bolts.
This chuck has a 0.87″ (22 mm) through hole. The chuck can hold work up to 3.15″ (80 mm) in diameter.
The radial runout of a test bar held in this chuck, when the chuck is mounted true, is 0.003″ maximum.
*NOTE: * Note Don’t forget to purchase a set of Studs & Nuts to accommodate changes in chuck or adapter configurations.

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