Ningbo Qunli Fastener Manufacture Co., Ltd.

Ningbo Qunli Fastener Manufacture Co., Ltd. manufactures fasteners using a range of cold forming, machining, and hot forging production equipment. The company operates imported fully automatic forming machines for M2–M30, thread rolling/tapping machines for M2–M100, and multiple stamping and machining setups, alongside hot forged bolt and nut automatic and semi-automatic production lines. Manufacturing processes include wire drawing surface treatment, heat treatment (including belt furnaces and bar heat-treatment production lines), and corrosion-protection surface treatments such as hot-dip galvanizing, Dacromet (including 5-axis automatic spraying and linear dip-and-dry lines), and multi-element hot-dip zinc plating with automated surface processing (phosphating and passivation). Quality and inspection are supported by universal tensile testing, low-temperature impact testing, axial force testing, salt spray testing, spectroscopy, hardness testing, metallography microscopy, coating thickness measurement, ultrasonic flaw detection, friction coefficient testing, and non-destructive magnetic particle inspection. The company also uses annealing furnaces, including protective-gas annealing and a rotary bottom annealing furnace.

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