Jacobs Chuck ball bearing taper mount chuck. One-piece sleeve eliminates crack between driving teeth often found in other designs. Through-hardened sleeve teeth plus hardened nose and keyholes provide outstanding wear resistance. TIR 0.003-inches maximum at half capacity. 0.04-inches minimum and 0.625-inches maximum capacity. 3JT mount and K4 key number. 4-5/16-inches close and 3-17/64-inches open length. 2-5/8-inches sleeve diameter.
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