Medium Duty Plain Bearing Chucks, K30, Threaded 1/2-20

Fluted sleeve standard on all models except 6200, 6206, 6204, 6208, 31138, which are smooth and ground. Jaws center-ground for absolute straightness and alignment. Jaws specially treated to ensure extended thread life and high gripping surface hardness. One-piece sleeve eliminates crack between driving teeth often found in other designs. Through-hardened sleeve teeth, nose, and keyholes for wear resistance.