Thru-Hole3-JAW 3L/3LA CRANK type 3-Jaw Extra Long Jaw Stroke Thru-Hole Power Chuck It's a CRANK type 3-jaw with the large through-hole, and extra long jaw stroke. Matching surfaces of all parts hardened, ground and lubricated directly. Construction of high rigidity and high clamping accuracy. J value is the hole diameter of blank draw nut, K is the maximum thread specification, and it could be customize.
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