Heavy Duty Plain Bearing Chucks, K4, 0.18 in-0.8 in Cap., 3JT Female, Key Drive

Fluted sleeve standard on all models except 14451. 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.