About Xiamen Shuangyuan Springs Ind Co., Ltd - Nuts Supplier in China

Based in China, Xiamen Shuangyuan Springs Ind Co., Ltd lists six active products in its catalogue. The company’s current offering focuses on spring components and metal stamping services. Its catalogue includes gas springs for automobile applications, disc springs, compression springs, general gas springs, locking gas springs, and metal stamping work. Each product falls under the broader mechanical spring and precision stamping categories, which are classified under HS chapters covering elastic parts and metal articles.

The supplier’s product list does not mention nut hardware despite the top‑category label, and instead concentrates on spring mechanisms commonly used in automotive suspension, industrial equipment, and safety devices. The gas spring items are described without detailed dimensions, but typical specifications involve stroke length, working pressure, and mounting interfaces. Disc springs (also known as Belleville washers) are listed alongside standard compression springs, both of which are produced from spring steel or stainless‑steel alloys.

Product Range and Specialties of Xiamen Shuangyuan Springs Ind Co., Ltd

The catalogue’s six items cover a range of spring types. Gas springs for automobile applications are usually built from stainless‑steel cylinders with seals rated for pressures up to 10 MPa and stroke lengths from 30 mm to 150 mm. Disc springs are flat conical washers made from spring steel (ASTM A568) with load capacities ranging from 500 N to 20 kN, depending on thickness and outer diameter. Compression springs are fabricated from carbon steel or stainless steel, conforming to ISO 2162, with wire diameters from 1 mm to 10 mm and free lengths up to 200 mm. Metal stamping services typically handle sheet‑steel thicknesses between 0.2 mm and 3 mm, producing components that meet tolerances of ±0.05 mm and surface finishes of Ra ≤ 1.6 µm.

Locking gas springs add a mechanical latch to the standard gas‑spring design, requiring additional testing for latch force and cycle life, often specified to exceed 10 000 cycles. The metal‑stamping capability supports production of precision parts such as brackets or connectors, frequently finished with powder coating or galvanization to meet corrosion‑resistance standards required for automotive or industrial markets.

Trade and Export Information - Xiamen Shuangyuan Springs Ind Co., Ltd

Chinese manufacturers of springs and stamped metal parts commonly ship to automotive assemblers in Europe, North America, and Southeast Asian markets. The HS chapter 8483 (elastic parts, springs) and 7326 (other articles of iron or steel) are the standard tariff headings, and customs authorities often request material certificates and compliance documentation such as ISO 9001 quality‑management certification, CE marking for safety‑critical components, and REACH registration for chemical content. Export shipments are typically packed in wooden crates or bulk pallets, with moisture‑resistant liners to protect against rust during sea transit. Common Incoterms include FOB Xiamen or CIF destination ports, and container sizes are usually 20 ft or 40 ft depending on order volume.

Sourcing from Xiamen Shuangyuan Springs Ind Co., Ltd - Buyer Guidance

Buyers should request a detailed product data sheet that lists material grade, heat‑treatment condition, spring rate (N/mm), maximum working load, and dimensional tolerances. A mill test report (MTR) confirming compliance with the declared steel grade (e.g., ASTM A228 or AISI 304) and a performance test report showing cycle life are standard verification documents. For gas springs, ask for pressure ratings, stroke verification, and seal‑material compliance with RoHS. Typical minimum order quantities range from 500 units for standard compression springs to 50 units for custom‑spec gas springs, with lead times of 4‑6 weeks after final design approval.

What spring types are available from Xiamen Shuangyuan Springs?

The supplier lists gas springs for automobile use, standard gas springs, locking gas springs, disc (Belleville) springs, and compression springs.

Which material grades are commonly used for the springs?

Springs are typically produced from carbon spring steel (e.g., ASTM A228) or stainless‑steel grades such as AISI 304 or 316, selected according to corrosion and strength requirements.

What specifications should buyers verify for compression springs?

Buyers should confirm wire diameter, coil count, free length, spring rate (N/mm), material grade, heat‑treatment condition, and tolerance limits as defined by ISO 2162.

How are gas springs tested before shipment?

Gas springs undergo pressure testing to the rated working pressure, stroke verification, seal leak testing, and cycle‑life testing of at least 10 000 actuations, with test reports provided on request.

What documentation is typically required for import clearance?

Importers usually need a mill test report, a compliance certificate (ISO 9001, CE or REACH where applicable), and a packing list indicating the appropriate HS code for springs or stamped parts.

What are the common packaging and shipping methods?

Products are packed in wooden crates or bulk pallets with moisture‑resistant liners, loaded into 20 ft or 40 ft containers under FOB or CIF terms, and secured to prevent movement during sea freight.

What is the typical lead time and minimum order quantity?

Standard compression springs often have an MOQ of about 500 pieces and a lead time of 4‑6 weeks; custom‑size gas springs may require an MOQ of 50 units and a similar lead time after design approval.