Heavy Duty Plain Bearing Chuck, K3, 0.04 in-1/2 in Cap., Jacobs 33JT Female

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.