If you’re sourcing square nuts for your next big project, you know how crucial it is to find a reliable supplier in China. I’m Monica Song, founder of Shanghai Hengrui Industry Co., Ltd, with over 15 years of experience in the fastener game. Whether you’re buying for automotive, construction, or machinery use, I’ve got you covered.
Let’s dive into the top 10 square nut manufacturers that consistently deliver—technically, timely, and cost-effectively.
1. Shanghai Hengrui Industry Co., Ltd
Company Overview: Shanghai Hengrui is your go-to for OEM and custom square nuts made with precision. We use certified materials, follow ISO production processes, and ship globally with strong support.
Established: 2021
Location: Shanghai
Main Products: Square nuts, Screw, nuts, washers, and custom fasteners, machined parts, stamping parts
We’re a young company with an old soul. Backed by 15+ years of technical experience and a highly efficient production line, we’ve served big project clients in North America and Europe.
2. Aozhan Hardware Fastener Co., Ltd.
Company Overview: Aozhan focuses on high-quality square nuts made from carbon steel, stainless steel, and brass, compliant with DIN and ISO standards.
Established: 2005
Location: Hangzhou, Zhejiang
Main Products: Square nuts, precision/custom fasteners
With advanced facilities and rigorous quality control, Aozhan’s square nuts are widely used in construction, automotive, and machinery. Their precision and cost-effectiveness make them a top contender.
3. Yijin Hardware Co., Ltd.
Company Overview: Since 2003, Yijin has been producing top-tier square nuts, hex nuts, and bolts for international clients.
Established: 2003
Location: Shenzhen, Guangdong
Main Products: Square nuts, hex nuts, bolts
Their reputation is built on solid engineering, reliable supply chains, and strict compliance with international fastener standards.
4. Shanghai Jianxin Hardware Co., Ltd.
Company Overview: Jianxin is famous for precision fasteners used in critical sectors like nuclear and mechanical industries.
Established: 2001
Location: Shanghai
Main Products: Square nuts, hex nuts, flange nuts
They offer nuclear-grade production capacity and robust lab testing facilities. Their square nuts meet some of the most demanding global applications.
5. Jiaxing Qimu Trading Co., Ltd.
Company Overview: With more than 20 years of fastener experience, Qimu has a yearly output of 25,000 tons.
Established: ~2000
Location: Jiaxing, Zhejiang
Main Products: Square nuts, screws, anchors
Qimu is ISO9001 and ISO14001 certified, exporting to 50+ countries. They’re efficient, large-scale, and very OEM-friendly.
6. Ningbo OuKaiLuo Hardware Co., Ltd.
Company Overview: OuKaiLuo delivers top-quality fasteners, backed by multiple certifications including ISO, SGS, and RoHS.
Established: 1999
Location: Ningbo, Zhejiang
Main Products: Square nuts, bolts, screws
Their products are used extensively in both mechanical and construction markets overseas.
7. Shanghai Jingyang Fastener Co., Ltd.
Company Overview: Jingyang manufactures a full line of fasteners with a strong reputation in overseas markets.
Established: 2001
Location: Shanghai
Main Products: Square nuts, hex nuts, bolts
Customers love their technical depth and reliable service model.
8. HISENER Industrial Co., Ltd.
Company Overview: HISENER produces square nuts, flange nuts, and lock nuts. All certified to international standards.
Established: 2004
Location: Haining, Zhejiang
Main Products: Square nuts, flange nuts, lock nuts
Perfect for automotive and building applications, HISENER’s nuts are ISO and CE certified, and exported globally.
9. Yangzhou XIYI Fasteners Co., Ltd.
Company Overview: XIYI builds all types of nuts, bolts, and screws with strong conformance to DIN and ISO standards.
Established: 2010
Location: Yangzhou, Jiangsu
Main Products: Square nuts, bolts, screws
They’re recognized for accuracy and responsiveness, which buyers love.
10. Dongguan Hongrui Hardware Technology Co., Ltd.
Company Overview: Hongrui focuses on CE- and RoHS-certified square nuts and bolts. Their attention to QC and customer service stands out.
Established: N/A
Location: Dongguan, Guangdong
Main Products: Square nuts, bolts
A solid pick for mid-size custom orders and stable partnerships.
Summary Table – Top Square Nut Suppliers in China
| Company Name | Location | Founded | Main Products |
|---|---|---|---|
| Shanghai Hengrui Industry Co., Ltd. | Shanghai | 2021 | Square nuts, bolts, Screw, nuts, |
| Aozhan Hardware Fastener Co., Ltd. | Hangzhou, Zhejiang | 2005 | Square nuts, precision/custom fasteners |
| Yijin Hardware Co., Ltd. | Shenzhen, Guangdong | 2003 | Square nuts, hex nuts, bolts |
| Shanghai Jianxin Hardware Co., Ltd. | Shanghai | 2001 | Square/hex/flange nuts |
| Jiaxing Qimu Trading Co., Ltd. | Jiaxing, Zhejiang | ~2000 | Square nuts, screws, anchors |
| Ningbo OuKaiLuo Hardware Co., Ltd. | Ningbo, Zhejiang | 1999 | Square nuts, bolts, screws |
| Shanghai Jingyang Fastener Co., Ltd. | Shanghai | 2001 | Square/hex nuts, bolts |
| HISENER Industrial Co., Ltd. | Haining, Zhejiang | 2004 | Square/flange/lock nuts |
| Yangzhou XIYI Fasteners Co., Ltd. | Yangzhou, Jiangsu | 2010 | Square nuts, bolts, screws |
| Dongguan Hongrui Hardware Technology Co., Ltd. | Dongguan, Guangdong | N/A | Square nuts, bolts |
Frequently Asked Questions
Q1: What are square nuts typically used for?
A: Square nuts are commonly used in woodwork, heavy machinery, and vintage restoration, offering four-sided grip and easy tool access.
Q2: Can I request custom threading or material for square nuts?
A: Absolutely. Most of the above manufacturers provide OEM services, including custom threading, coatings, and material grades.
Q3: What certifications should I check for?
A: Look for ISO 9001, CE, SGS, and RoHS to ensure quality and compliance with international markets.
Q4: How do I get a sample before placing a bulk order?
A: Contact the supplier directly via their website. Many, like Hengrui, offer free samples (shipping may apply).
Conclusion
There you have it—10+ proven manufacturers for square nuts in China. Whether you need bulk stock, OEM orders, or precision parts, these companies are ready to deliver.
Contact Hengrui Fastener for Custom Square nuts
For specialized applications that require custom solutions, Hengrui Fastener offers high-quality, customizable Square nuts 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.
