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3.1″ 4-Jaw Self-Centering Chuck Body- Electroless Nickel-Teflon Coated – 3/4-16 Thread
This chuck will automatically center square or round stock. (The stock must be accurately shaped for all four jaws to grip.) It will also grip thin-wall tubing in four places rather than three, which spreads out the load and allows more grip without crushing the tubing. It has an electroless Nickel-Teflon coating that has been applied to help prevent wear and corrosion. This special coating has been applied to all external and internal surfaces of the chuck (except for chuck jaws), significantly improving the life of the chuck. The chuck also opens and closes more smoothly due to the lubrication properties of Nickel-Teflon.
Centering accuracy on self-centering chucks is to within a few thousandths of an inch. If perfect centering accuracy is required using an independent chuck is recommended.