contact semi-automatic welding of hinge bodies with the stabiliser strut rod provides a threefold margin of welded seams strength; ball pin is made of heat-treated high quality alloy steel; sphere and finger flange are additionally strengthened by rolling with rollers; ball pin threads are made by knurling method, which achieves high accuracy and thread strength; covers made of oil-benzo-ozone-resistant thermoplastic polyurethane: 3 times stronger than rubber and silicone analogues, anti-corrosion coating of the body and ball pin
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