contact semi-automatic welding of hinge bodies with the stabiliser bar provides a threefold margin of safety welds; ball pin is made of heat-treated high-grade alloy steel; sphere and finger flange are additionally strengthened by rolling rollers;ball pin thread is made by knurling method, which achieves high accuracy and strength of thread; special antifriction grease of Shell company is applied to the sphere of ball pin; covers are made of oil-gasoline-ozone-resistant thermoplastic polyurethane: durability 3 times higher than rubber and silicone analogues,anti-corrosion coating of the body and ball pin.
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