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紧固件（螺栓·螺钉·螺母·垫圈·锚栓）
中国紧固件主要集中在三大产业带：河北邯郸永年做碳钢标准件（螺栓、螺母、牙条），浙江嘉兴海盐做冷镦非标件与异形件，浙江温州路桥做不锈钢及高强度紧固件。多数源头工厂不经过贸易商，报价一般按图纸或按标准号（DIN/ISO/GB）计算，只有异形件才收模具费。
产业带
标准件主产区：河北永年（邯郸）、江苏高邮、江西金溪；非标/异形件主产区：浙江温州路桥一带
典型产品
材质
表面工艺
报价会引用的标准
规格参考表
| 参数项 | 需要约定的内容 |
|---|---|
| Property class | 4.8 / 5.8 / 8.8 / 10.9 / 12.9 (ISO 898-1) |
| Stainless grade | A2-70 / A4-80 (ISO 3506) |
| Thread | Metric coarse & fine, UNC / UNF, self-tapping GA/GB |
| Head styles | Hex, socket cap, flange, countersunk, truss, washer-faced |
| Sizes in stock | M3–M64 (belt-dependent), length 6–300 mm |
| Plating thickness | Electro-galvanised 5–12 µm; hot-dip 45–85 µm |
| Salt-spray | White rust 24–72 h (blue zinc); red rust 200–1000 h (Dacromet / HDG) |
| Testing | Tensile, hardness HRC, torque-to-failure, hydrogen embrittlement delay test |
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买家常见问题
How do you get an accurate fastener price from a Chinese factory?
Send either the standard code (e.g. DIN 933 M8x40, 8.8, zinc yellow) or a dimensional drawing with material, property class, coating and quantity per size. Factories quote from weight (kg) plus plating cost, so an accurate drawing or a sample photo with measurements is enough to get a same-week price.
Is hot-dip galvanising or zinc plating better for outdoor fasteners?
For buried, marine or long-term outdoor use, hot-dip galvanising (45–85 µm) is the durable choice but changes fine thread fit, so threads must be cut after plating. For indoor or painted assemblies, electro-galvanised (5–12 µm) is cheaper and dimensionally exact.