Ball pin is made of heat-treated high-grade alloy steel; sphere and groove of the pin are additionally strengthened by rolling rollers; thread of the ball pin is made by knurling, it achieves high accuracy and strength of the thread; covers of oil-gas-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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