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Jaw chuck from the chuck body, movable jaw and jaw drive mechanism. On the following three jaw chuck jaws guide portion, a flat-Threaded and dished back of the bevel gear is engaged, when the rotation of small bevel gear with a wrench through four holes, disc gear, screw on the back of the plane at the same time drive to the center three jaws close or quit for clamping workpieces of different diameters. Used in the three jaws put three anti-claw, used to install a larger diameter of the workpiece. Self-jaw chuck for the accuracy of 0.05-0.15mm. Precision three-jaw chuck with the workpiece is affected by wear and use of post-manufacturing precision chucks. Chuck is used to clamp the workpiece on the machine's mechanical devices. Use are radially movable jaws of cloth on the chuck body movement, the workpiece clamping and positioning of machine tool accessories. Chuck generally consists of three parts chuck body, movable jaw and jaw drive mechanism. Chuck minimum diameter of 65 mm, up to 1500 mm, the central through-hole, so that through the workpiece or the bar; back short cylindrical or conical structure, coupled directly or through the flange and spindle ends . Chuck usually mounted on the lathe, cylindrical grinder and internal grinding machines, also can cooperate with a variety of indexing means, used for milling and drilling. Brand: Universal, Jianhua, a round card, Wafangdian, Miyoshi card, and Shanghai specifications: 80,100,125,130,160,165,200,240,250,320,350,400,500,800,1000, 1200 Tianjin Junko hardware firms the main types of measuring tools, cutting tools, machine tool accessories, low prices, quality assurance, fake a compensable 10, the domestic first-class brand everything, customers are welcome to contact us.