About Zhejiang Zhongrui Auto Parts Co., Ltd. - Automotive Fasteners Supplier in China

Zhejiang Zhongrui Auto Parts Co., Ltd. operates in Zhejiang province, China and lists 30 distinct automotive fastener products. The catalogue covers a spectrum of bolts, nuts, washers and flanges that are identified by standards such as ANSI/ASME B18.2.1, GB21, GB5785 and DIN series, each recorded with the corresponding HS‑code reference in the supplier data. Products include hexagon head bolts, square head bolts, U‑bolts, various hexagonal and square nuts, and high‑strength washers, all fabricated from steel. The HS‑code entries span families commonly classified under Chapter 73 (e.g., 7318 for threaded steel fasteners) and specific standard‑based codes provided by the supplier. The listing also notes custom‑engineered variants for passenger‑car wheel bolts, EV‑specific nuts and lock‑type fasteners, reflecting a diversified product set for OEM and aftermarket use.

The supplier’s profile emphasizes compliance with international standards such as ISO, DIN, ANSI and GB/T, which are reflected in the product titles. No additional certifications are claimed in the supplied data, but the catalogue explicitly references IATF 16949 for certain fine‑pitch bolts and nuts. All items are described as steel components, indicating a focus on metallic fasteners rather than composite or polymer alternatives. The range therefore targets automotive assembly lines, sub‑assembly suppliers and repair shops that require precise, standard‑grade fastening solutions.

Product Range and Specialties of Zhejiang Zhongrui Auto Parts Co., Ltd.

The catalogue groups products by standard families: ANSI/ASME B18.2.1 hexagon and square head bolts, GB21 and GB5785 fine‑pitch bolts, ANSI/ASME B18.5 round‑head bolts, and a full set of nuts covering hexagonal, square, lock, nylon‑insert and welded types. Typical industry grades for these steel fasteners are property class 8.8, 10.9 or 12.9, with tensile strengths ranging from 800 MPa to 1 200 MPa, and thread pitches that meet metric (M) or UNC/UNF dimensions. Washers listed under ANSI/ASME B18.22.1, DIN 134 and GB1230 are usually supplied in high‑strength grades suitable for structural steel applications. In the automotive sector, such components are often required to meet tolerance limits of ±0.02 mm for thread pitch and surface hardness of 35‑45 HRC, and they may be heat‑treated (e.g., quench‑tempered) to achieve the specified strength class.

Industry practice for automotive fasteners also includes surface treatments such as black oxide, zinc plating or phosphate coating to enhance corrosion resistance. Buyers typically request material test reports (MTR), hardness certificates and dimensional inspection reports that reference the relevant ISO or DIN standard. The supplier’s inclusion of custom‑fabrication capability aligns with common market demand for OEM‑specific head styles, thread lengths and flange dimensions.

Trade and Export Information - Zhejiang Zhongrui Auto Parts Co., Ltd.

China is a leading exporter of automotive fasteners, with the majority of shipments destined for North America, Europe, Southeast Asia and the Middle East. Fasteners classified under HS 7318 are subject to anti‑dumping investigations in certain markets, so importers often verify that the goods are marked with the correct country of origin and comply with the destination’s technical regulations, such as FMVSS in the United States or ECE‑R‑112 in the European Union.

Typical export logistics involve bulk packing in cardboard cartons or wooden crates, loading into 20‑ft or 40‑ft containers with a net weight of up to 20 tonnes per container. Common Incoterms used by Chinese fastener exporters are FOB Hangzhou (Zhejiang) or CIF major ports such as Shanghai. Buyers usually require certificates of conformity to ISO 9001 or IATF 16949, and may request test reports complying with ASTM A193 for bolts or ASTM A194 for nuts. Export documentation often includes a commercial invoice, packing list, certificate of origin and, where required, a material safety data sheet for coated products.

Sourcing from Zhejiang Zhongrui Auto Parts Co., Ltd. - Buyer Guidance

When sourcing from Zhejiang Zhongrui Auto Parts, buyers should request the specific grade designation (e.g., 8.8, 10.9, 12.9) and confirm the thread standard (ISO metric, UNC/UNF, DIN) for each bolt or nut. A material test report that lists chemical composition, tensile strength and hardness should be obtained before order confirmation.

Samples of critical items such as wheel bolts or lock nuts are advisable to verify fit and finish, especially when custom dimensions are quoted. Verify that the supplier can provide ISO 9001 or IATF 16949 audit reports, and ask for a declaration that the products meet the relevant automotive standards cited in the catalogue (e.g., GB5785, DIN 928A). Confirm packaging details - typically bulk cartons of 500 pcs for nuts or 200 pcs for bolts - and ensure that the agreed Incoterm and container load plan match the buyer’s logistics schedule.

What types of automotive bolts does Zhejiang Zhongrui Auto Parts manufacture?

The supplier lists ANSI/ASME B18.2.1 hexagon and square head bolts, GB21 and GB5785 fine‑pitch bolts, as well as specialized wheel bolts and U‑bolts, all produced from steel and referenced by their standard codes.

Are the nuts offered compatible with ISO and DIN standards?

Yes, the catalogue includes hexagonal, square, lock and welded nuts that reference ISO, DIN, ANSI and GB/T standards, such as AS1252 metric high‑strength nuts and DIN 980M locking nuts.

What material are the fasteners made from?

All listed items are steel components; surface treatments such as black oxide or zinc plating are mentioned in product descriptions but the base material remains steel.

Which HS‑code family covers the majority of these products?

Most fasteners fall under HS Chapter 73, specifically HS 7318 for threaded steel fasteners, with the supplier’s own standard‑based codes (e.g., ANSI/ASME B18.2.1) used for internal classification.

What certifications should a buyer request from this supplier?

Buyers should ask for ISO 9001 or IATF 16949 audit reports, material test reports and hardness certificates that correspond to the grade and standard of each fastener.

How are the fasteners typically packaged for export?

Standard practice is bulk packing in cardboard cartons or wooden crates, with typical quantities of 200‑500 pieces per carton, loaded into 20‑ft or 40‑ft containers under FOB or CIF terms.

What are common lead times for custom automotive fasteners?

Custom orders for specialty head styles or dimensions usually require a lead time of 4‑6 weeks after final design approval and sample acceptance.

Which markets commonly import Chinese automotive fasteners?

Key import markets include the United States, Germany, Japan, South Korea and the United Arab Emirates, where automotive OEMs and Tier‑1 suppliers source high‑strength bolts, nuts and washers for vehicle assembly.