ball pin is made of heat-treated high-grade alloy steel; sphere and finger groove are additionally hardened by rolling rollers; ball pin thread is made by knurling method, which achieves high accuracy and strength of thread; covers made of oil-gas and ozone-resistant thermoplastic polyurethane: strength 3 times higher than rubber and silicone analogues, anti-corrosion coating of the body; anti-corrosion coating of the ball pin.
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