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Detachable Cylinder Weld Hinge with Stop Pin. Built-in stop pin to limit door opening angle and prevent over-swing. Detachable split cylinder design for quick installation and disassembly. Thick solid steel tube structure delivers strong heavy load capacity. Precision machined shaft enables smooth, stable rotation without shaking. Wear-resistant matte metal surface for long service life indoors and outdoors. Multiple sizes available for iron gates, metal doors and engineering frames.