"Cone" is bolt ball steel grid structure used in accessories, welding in the steel pipe end, high strength bolt screw through the hole at the bottom of the screw in the bolt, nut inside the cone head, the same as the "seal plate" role, steel pipe diameter is small the "board", and the diameter of steel pipe in order to avoid when compared to the same bolt ball collision between steel tube, using the "cone". The "cone head" or "seal plate" and the steel tube form the "rod" of the bolt ball frame structure. The term "seal plate" and "cone head" are sometimes referred to collectively as "seal head".
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