When you’re sourcing ASTM A325 heavy hex structural bolts from China, you want more than a catalog and a price. You need technical reliability, fast delivery, and international standards compliance. I’m Monica Song from Shanghai Hengrui Industry Co., Ltd, and with over 15 years in this industry, I know exactly what matters to overseas buyers like you.
So I’ve handpicked and verified 10 top structural bolt manufacturers in China, all capable of producing ASTM A325, A490, and other heavy hex structural bolts for your projects.
Quick Summary Table：ASTM A325 Bolt Suppliers in China
| Company Name | Key Products | Strengths |
|---|---|---|
| Shanghai Hengrui Industry Co., Ltd. | A325 bolts, Screw, bolts, washers | Fast delivery, ISO, OEM, 15+ years exp. |
| Ningbo Teng Qi Fasteners Co., Ltd. | ASTM A325 bolts | Leading ASTM A325 manufacturer in China |
| Ningbo Fastenwell Hardware Co., Ltd | A325/A490 structural bolt kits | Full sets (bolt + nut + washer), bulk-ready |
| Hebei Chengyi Engineering Materials | ASTM A325 bolts | 23 years experience, stable quality |
| T&Y Hardware | A325 Types 1/2/3 | Full series, exported worldwide |
| Ningbo Zhongli Bolts Manufacturing | A325 structural bolts | Rich export experience |
| JOIN-fasteners® | A325 Type 1 bolts, A563 nuts | 18+ years, strong QC, timely delivery |
| Jiaxing Haina Fastener Co., Ltd | A325 bolts, threaded rods | ISO certified, flexible MOQ |
| Ningbo Beilun MILFAST METALWORKS | Structural bolts, A325 kits | Custom sizes, quick response |
| Handan Haoqiang Fasteners | A325 bolts, anchors | Good price-performance ratio |
1. Shanghai Hengrui Industry Co., Ltd
Company Overview: Shanghai Hengrui is specialized in standard & non-standard bolts including ASTM A325/A490 heavy hex structural bolts. With strong OEM capability and a full line of turning, stamping, and surface treatment services, we cater to industrial, construction, bridge, and energy projects.
Founded: 2021 (team experience over 15 years)
Location: Shanghai
Main Products: A325 bolts, Nuts, bolts, Screw, washers, and custom fasteners, machined parts, stamping parts
We meet ASTM, DIN, ISO standards and offer test reports from SGS/TUV. Sizes range from 1/2″ to 1-1/2″, available in plain, zinc plated, hot-dip galvanized, Dacromet.
2. Ningbo Teng Qi Fasteners Co., Ltd
Company Overview: One of China’s leading producers of ASTM A325 bolts, Teng Qi focuses on high-strength bolts for structural steel connections.
Location: Ningbo, Zhejiang
Key Products: A325 bolts (M12-M36 / 1/2″-1-1/2″)
Made from medium carbon, alloy steel or B7, all bolts meet full ASTM A325 specs. Surface treatments include hot-dip galvanizing. Ideal for bridges, buildings, and tower structures.
3. Ningbo Fastenwell Hardware Co., Ltd
Company Overview: Top 10 structural bolt supplier in China, Fastenwell manufactures complete structural kits including ASTM A325 bolts, A563 nuts, F436 washers.
Location: Ningbo, Zhejiang
Specialty: Full bolt-nut-washer sets
Perfect for bulk projects requiring certified assemblies. Known for high output and custom packing.
4. Hebei Chengyi Engineering Materials Co., Ltd
Company Overview: With over 2 decades of production experience, Chengyi focuses on ASTM A325 bolts with proven mechanical stability.
Location: Hebei Province
Backed by trained engineers and advanced machines, they serve industrial and commercial infrastructure projects.
5. T&Y Hardware
Company Overview: T&Y offers the complete range of ASTM A325 bolts including Types 1, 2, and 3, compliant with international standards.
They are strong on global exports, especially in the US, Europe, and Southeast Asia.
6. Ningbo Zhongli Bolts Manufacturing Co., Ltd
Company Overview: Zhongli specializes in ASTM A325 bolts for steel structure joints. With deep export experience, they understand customs, certifications, and loading efficiency.
Ideal for international buyers seeking turnkey fastener solutions.
7. JOIN-fasteners®
Company Overview: Based in Eastern China, JOIN-fasteners is experienced in ASTM A325 Type 1 bolts, supported with matching A563 nuts.
They emphasize tight QA, document traceability, and timely logistics.
8. Jiaxing Haina Fastener Co., Ltd
Company Overview: A long-time exporter, Haina offers a range of heavy hex structural bolts, meeting international buyer standards.
Good for buyers needing smaller batches or flexible specs.
9. Ningbo Beilun MILFAST METALWORKS Co., Ltd
Company Overview: MILFAST provides custom fastener solutions including structural bolt kits.
Known for quick engineering responses and size flexibility.
10. Handan Haoqiang Fasteners Manufacturing Co., Ltd
Company Overview: Haoqiang has built a reputation for cost-effective yet reliable ASTM A325 bolts, ideal for mid-scale projects.
They hold ISO certification and serve both domestic and global markets.
FAQ
Q1: What is ASTM A325?
A: ASTM A325 is a specification for high-strength heavy hex bolts used in structural steel joints.
Q2: What materials are used?
A: Typically medium carbon steel, B7, or alloy steel, depending on type and finish.
Q3: What types are available?
A: ASTM A325 includes Type 1 (carbon steel), Type 2 (withdrawn), and Type 3 (weathering steel).
Q4: Can I request full kits (bolt + nut + washer)?
A: Yes. Many suppliers offer ASTM A563 nuts + F436 washers to match.
Q5: Are these bolts suitable for bridges or towers?
A: Absolutely. A325 bolts are widely used in bridges, stadiums, towers, and high-rise buildings.
Contact Hengrui Fastener for Custom ASTM A325 bolts
Choosing the right structural bolt supplier in China is about more than pricing. It’s about getting the right material, finish, certificates, and deadlines met. From my perspective as a supplier, I can confidently say the manufacturers above are ready to meet international expectations.
For specialized applications that require custom solutions, Hengrui Fastener offers high-quality, customizable A325 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.
