If you’re sourcing hex coupling nuts from China, you’re probably juggling cost, lead time, and—let’s be real—trust issues. I’ve been there.
I’m Monica from Shanghai Hengrui Industry Co., Ltd, and with over 15 years in the fastener industry. So today, I’ve rounded up 10 trusted hex coupling nut manufacturers in China. Whether you’re buying for machinery, construction, or exports, this list will help you make informed decisions.
1. Shanghai Hengrui Industry Co., Ltd
Company Overview: We at Shanghai Hengrui specialize in top-quality fasteners—including hex coupling nuts. With a decade and a half of technical expertise, our facility in Shanghai delivers OEM-grade products to clients across North America, Europe, Korea, and Japan.
Established: 2021
Location: Shanghai
Main Products: Hex coupling nuts, Screw, nuts, washers, and custom fasteners, machined parts, stamping parts
We manufacture hex coupling nuts per DIN 6334 and other global standards. Whether carbon steel, stainless, or coated variants—we support custom specs and drawing-based production.
2. Ningbo Teng Qi Fasteners Co., Ltd.
Company Overview: A specialist in DIN 6334 hex coupling nuts, Teng Qi has been delivering high-precision products since 2003. Their parts are known for consistent tolerance and reliability.
Location: Ningbo, Zhejiang
Main Products: Hex coupling nuts, general fasteners
They support bulk OEM orders and offer various materials: low carbon steel, stainless, zinc, and hot-dip galvanized finishes.
3. Kunshan Zhonggu Precision Hardware Co., Ltd.
Company Overview: Zhonggu is an ISO9001/CE/SGS certified manufacturer with strong engineering background. Their hex coupling nuts comply with GB, DIN, and ISO standards.
Location: Kunshan, Jiangsu
Established: 2006
Main Products: Precision fasteners, hex coupling nuts
Great choice for those with high QA requirements in automotive and wind power sectors.
4. T&Y Hardware
Company Overview: T&Y offers a one-stop fastener solution, with hex coupling nuts as a key line. Their strength lies in logistics and export flexibility.
Location: China
Main Products: Hex coupling nuts, bolts
They’re not the biggest, but they’re responsive and flexible for growing buyers.
5. QJ Fastener
Company Overview: With over 8 years in production, QJ Fastener delivers hex coupling nuts in carbon steel and stainless variants. They’re well-versed in international markets.
Location: China
Main Products: Hex coupling nuts, wing nuts, bolts, washers
Their zinc and hot-dip coatings are reliable. Good if you’re managing multi-country distribution.
6. Shanghai TopKun Industry Co., Ltd.
Company Overview: TopKun is a solid producer of standard and custom fasteners with strong in-house testing and ISO9001 systems.
Location: Shanghai
Established: 2006
Main Products: Hex coupling nuts, high-strength bolts
Known for steady capacity and quality documentation support.
7. Siyi Fastener
Company Overview: A pure-play hex coupling nut supplier offering dependable specs and budget-friendly quotes.
Location: China
Main Products: Hex coupling nuts
Perfect for smaller or regional buyers who prioritize consistent quality over volume.
8. Aoke Hardware
Company Overview: Aoke is based in Hangzhou and focuses on DIN6334 long hex nuts. They carry ISO certification and meet most global buyer standards.
Location: Hangzhou, Zhejiang
Main Products: Long hex coupling nuts
Ideal for large assemblies and machinery applications.
9. Ningbo Yi Pian Hong Fastener Co., Ltd.
Company Overview: Yi Pian Hong is known for stable production and export-ready quality. Their workshop supports custom tooling and OEM labeling.
Location: Ningbo, Zhejiang
Main Products: Hex coupling nuts, bolts, nuts
Good pick if you need both standard and special specs in the same shipment.
10. Wenzhou Lida Fastener Co., Ltd.
Company Overview: Lida has years of experience in manufacturing hex coupling nuts per ISO/DIN specs. Their products are well-received in Europe and Asia.
Location: Zhejiang
Main Products: Hex coupling nuts, industrial fasteners
Known for their in-house engineering and inspection support.
Quick Summary Table：Hex Coupling Nut Suppliers in China
| Company Name | Location | Established | Main Products |
|---|---|---|---|
| Shanghai Hengrui Industry Co., Ltd. | Shanghai | 2021 | Hex coupling nuts, bolts, Screw, OEM part |
| Ningbo Teng Qi Fasteners Co., Ltd. | Ningbo, Zhejiang | 2003 | DIN 6334 hex coupling nuts |
| Kunshan Zhonggu Precision Hardware Co., Ltd | Kunshan, Jiangsu | 2006 | Hex coupling nuts, precision fasteners |
| T&Y Hardware | China | N/A | Hex coupling nuts, bolts |
| QJ Fastener | China | N/A | Hex coupling nuts, washers, bolts |
| Shanghai TopKun Industry Co., Ltd. | Shanghai | 2006 | Hex coupling nuts, high-strength bolts |
| Siyi Fastener | China | N/A | Hex coupling nuts |
| Aoke Hardware | Hangzhou, Zhejiang | N/A | DIN6334 long hex coupling nuts |
| Ningbo Yi Pian Hong Fastener Co., Ltd. | Ningbo, Zhejiang | N/A | Hex coupling nuts, bolts, nuts |
| Zhejiang Lida Fastener Co., Ltd. | Zhejiang | N/A | Hex coupling nuts, standard fasteners |
| Shanghai Jingyang Fastener Co., Ltd. | Shanghai | N/A | Hex coupling nuts, bolts, nuts |
Frequently Asked Questions (FAQ)
Q1: What’s a hex coupling nut used for?
A: It connects two male-threaded components—typically threaded rods. Common in structural, industrial, and utility assemblies.
Q2: Can I get custom threads or coatings?
A: Yes. Most of these suppliers can offer UNC/UNF threads, special surface finishes like black oxide, Dacromet, or hot-dip galvanized.
Q3: What’s the MOQ?
A: Most accept small batch trial orders (1000 pcs or even less), especially for standard sizes.
Q4: How do I verify quality?
A: Ask for test reports, certificates, and production photos. Better yet, request samples before placing large orders.
Conclusion
Hex coupling nuts may look simple—but getting the right ones is all about choosing a factory that knows what they’re doing.
These 10 suppliers represent a mix of scale, specialization, and service.
If you’re unsure who to go with—send me a message. I’m Monica from Shanghai Hengrui. Let’s build your supply chain with the right bolts in place.
Contact Hengrui Fastener for Custom hex coupling nut
For specialized applications that require custom solutions, Hengrui Fastener offers high-quality, customizable hex coupling nut and fasteners. Whether you need a specific size, material, or finish, Hengrui can provide tailored fasteners to meet your exact requirements. Contact Hengrui Fastener to learn more about our products and services.
