Harlingen 4" 4-Jaw Self-Center Lathe Chuck Plain Back ~ 2 Sets of jaws. ~ Body is entirely made of wear-resistant semi-steel No.40/No.45 (ASTM) providing a higher hardness at HB190-220 compared to other brands using HT250 cast iron with hardness of HB180-220. ~ High quality No.35 (ASTM) is used to achieve a higher accuracy, strength and extended tool life. Competitors use HT150 cast iron or engineering plastics as a substitute. ~ Specific machines and fixtures have been adapted to process H-Groove simultaneously so the clamping accuracy is guaranteed. ~ Jaw are made of hardened carbon 1045 (ASTM) steel. ~ The jaws are pressed individually to ensure precise fit, powerful clamping performance and each jaw is interchangeable while maintaining accuracy. ~ The scroll is made of hardened and precision machined 5140 (ASTM) to enhance wear resistance and strength. ~ Scroll face threads are processed with high accuracy CNC machining which inproves self-centering performance. ~ Pinions are made of 20CrMnTi with a quenching procedue to enhance wear-resistance and strength. ~ Each chuck body has its own ID and is 100% inspected with trackable data. ~ Lathe Chuck wrench & 1 set of mounting screws included.
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