If you’re sourcing HDG tower bolts for high-voltage infrastructure or transmission lines, you need more than just a bolt — you need performance, compliance, and reliability.
As Monica from Shanghai Hengrui, I’ve been in the fastener industry for over 15 years, helping clients like Mark (hi, if you’re reading this!) source top-grade transmission tower bolts, especially those built to ASTM A394 standards.
After hours of research and years of hands-on experience, I’ve compiled this list of the Top 7 Transmission Tower Bolt Manufacturers in China. These factories don’t just produce generic hardware — they supply ASTM A394 tower bolts and hot-dip galvanized (HDG) bolts that meet strict international specifications. Whether you need bolts for grid-scale projects, municipal towers, or export-based EPC contracts, these suppliers understand the stakes — and deliver accordingly.
1. Shanghai Hengrui Industry Co., Ltd
Company Overview: Shanghai Hengrui is a leading fastener manufacturer, specializing in tower bolts, nuts, and custom-made fasteners for industrial projects.
Established: 2021
Location: Shanghai
Main Products: Tower bolts, HDG bolts, Screw, nuts, OEM fasteners
Our factory supports both standard (ASTM, DIN, ISO) and non-standard Transmission Tower Bolt requirements. Products are tested to meet mechanical performance specs and offer zinc plating, hot-dip galvanizing, and more.
2. Ningbo Teng Qi Fasteners Co., Ltd.
Company Overview: Teng Qi is a global leader in HDG a394 bolts, operating a 15,000m² facility equipped with advanced cold forging, hot forging, and threading lines.
Location: Ningbo, Zhejiang
Main Products: ASTM A394 HDG bolts, C45 steel and AISI 4140 tower bolts
Their bolts come in 1/4″ to 4″ diameter, up to 1000mm length, and strictly meet international mechanical requirements. A top choice for power, telecom, and bridge structures.
3. Jiaxing Haina Fastener Co., Limited
Company Overview: Haina is a dedicated producer of HDG a394 bolts for power towers, known for export-grade quality.
Location: Jiaxing, Zhejiang
Main Products: Galvanized tower bolts, HDG nuts and washers
With a focus on power and energy infrastructure, their fasteners meet ASTM and ISO standards. Products are widely used in structural steel frameworks.
4. Beijing Winner Electric Power Energy Co., Ltd
Company Overview: Winner Power supplies a range of tower bolts, nuts, and structural fasteners for power and telecom towers.
Location: Beijing
Main Products: HDG bolts, nuts, tower accessories
Known for close collaboration with China State Grid and regional telecom authorities. They offer ready-stocked solutions and engineering support.
5. X.Y. Towers
Company Overview: A full-package provider of transmission towers and high-strength anchor bolts since 2008.
Location: Southwest China
Main Products: L-type anchor bolts, HDG bolts, transmission towers
All fasteners undergo hot-dip galvanizing, and production complies with ANSI, AS, ISO, BS. Their bolts are used in substations and national grid projects.
6. D&D Hardware Industrial Co., Limited
Company Overview: D&D Hardware focuses on certified structural bolts, including those for tower use.
Location: Jiangsu
Main Products: HDG bolts, DIN/ANSI fasteners, structural nuts
Their international orientation means strong documentation, testing, and batch traceability. Ideal for EPC projects.
7. ZHAO QING ALLY HARDWARE CO., LIMITED
Company Overview: A full-spectrum fastener supplier with capability in large-diameter and long bolts for transmission projects.
Location: Zhaoqing, Guangdong
Main Products: Transmission tower bolts, industrial structural fasteners
Known for flexible production and responsive customer service. Strong in Southeast Asia and Middle East markets.
Quick Summary Table: Transmission Tower Bolt Manufacturers in China
| Company Name | Location | Main Products |
|---|---|---|
| Shanghai Hengrui Industry Co., Ltd. | Shanghai | Tower bolts, Screw, nuts, OEM fasteners |
| Ningbo Teng Qi Fasteners Co., Ltd. | Ningbo, Zhejiang | ASTM A394 HDG bolts |
| Jiaxing Haina Fastener Co., Limited | Jiaxing, Zhejiang | Galvanized transmission bolts |
| Beijing Winner Electric Power Energy Co., Ltd | Beijing | Transmission bolts, tower fasteners |
| X.Y. Towers | Southwest China | L-anchor bolts, towers |
| D&D Hardware Industrial Co., Limited | Jiangsu | Bolts, nuts, HDG fasteners |
| ZHAO QING ALLY HARDWARE CO., LIMITED | Zhaoqing, Guangdong | Tower bolts, industrial fasteners |
Frequently Asked Questions (FAQ)
Q1: What is a transmission tower bolt?
A: It’s a type of structural bolt used in high-voltage power towers, telecom towers, and bridge connections. They’re typically HDG-coated for corrosion resistance.
Q2: What is ASTM A394?
A: It’s the standard for bolts used in transmission towers, covering mechanical and coating specs. Most tower bolts on this list comply with it.
Q3: Can I order custom sizes or coatings?
A: Yes. Most factories here offer custom threads, head styles, lengths, and surface finishes like HDG, zinc-nickel, Dacromet.
Q4: What is the MOQ for A394 tower bolts?
A: It varies, but usually around 5000–10000 pcs per size. Custom orders may have higher requirements.
Conclusion
Transmission tower bolts aren’t just another piece of steel — they’re foundational to infrastructure safety. The 7 manufacturers listed here have proven track records in HDG bolts, export logistics, and project-grade compliance.
Contact Hengrui Fastener for Custom Transmission tower bolts
For specialized applications that require custom solutions, Hengrui Fastener offers high-quality, customizable Transmission tower bolts 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.
