HEX BOLTS

The products are strictly conform with DIN, ISO, ASTM, ANSI, BS, JIS...

● Level: A325/A325M/A490/A490M/8.8 /10.9/12.9/Gr5/Gr8

● Coating: Plain/Black/Galvanized/H.D.G /YZP/Dacromet/Xylan

ASTM B7/B7M

THREAD RODS

The longest can reach 3.66 meters(12FT)

China Professional Metal Fasteners

Manufacturer and Supplier with Over 20 Years of Experience

Bolt

Head shape: Hexagonal head, square head, round head can all be produced.
Size: M4-M100, 3/8 "-4"...

Nut

Type: hex nut, cap nut, couple nut, lock nut, spring nut
Size: M4-M100, 3/8'-4' is divided...

Washer

Type: Flat washer, spring washer
Specifications: M3-M100, 1/4

Threaded Rod

Size: M4-M100, 3/8 "-4", divided into metric size and inch size
Thread type: Full Thread

Precast Accessories

Size: Customization based on drawings or samples, both metric size and inch size are available

Custom Fasteners

Size: Customization based on drawings or samples, both metric size and inch size are available

About Material

Carbon steel, alloy steel, stainless steel are all acceptable.
According to customer requirements

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Topbolt - Best Standard Bolts and Nuts for Your Industries

The products are applied to architectural steel structures, brigdes, oil, pipeline, machinery equipment, furniture, vessel, railway.

Bridge
Industry
Ship
Solar Power
Steel Structural

Why Choose Topbolt for Your Projects?

Trusted Supplier of Bolts, Nuts, and Fasteners Conforming to DIN, ANSI/IFI, JIS, BS, ISO, and GB Specifications.

Ningbo Topbolt Metalworks Co., Ltd. is a manufacturer in China which mainly produces high strength fasteners and specializes in all kinds of hardwares. Founded in 2001, In the past few years, it developed fast with its factory located in Ningbo Zhenhai Chemical industrial area and its headquarter /foreign sales department in Ningbo Jiangdong Eastern Business Centre.

The factory now covers an area of approximately 15,000 square meters, with monthly production capacity of 2000 tons. The company has its all-around research system, supply management, large-scale warehouse...

Founded In

㎡

Covers an Area

Monthly Production Capacity

million

Annual Sales

DIGITAL SHOWROOM

If you want to learn more about our manufacturing capabilities, you can click on the avatar in the scene, or accept my invitation!

What Makes Topbolt Fasteners Manufacturing Stand Out?

Material Science

Carbon steel, alloy steel, stainless steel, Special material customization
Direct procurement from raw material factories, discounted prices, and sufficient stock availability

Standard

Strictly produce according to standard dimensions such as DIN, ISO, GB, JIS, ASTM, SAE, ASME, etc

Services

Accept customized production (including sample processing, drawing processing), OEM production

Topbolt News & Fasteners Knowledge Center

Marine Fastener Market Booms in 2026, 304 & 316 Stainless Steel Become Core Preferred Grade Amid Updated IMO Material Standards

2026-06-04

Driven by global offshore wind, shipbuilding and coastal infrastructure construction, the global marine fastener market hits USD 2.8 billion in 2026. Updated IMO and IACS industry specifications tighten corrosion and mechanical requirements for marine fasteners, further clarifying the applicable boundary between 304(A2) and 316(A4) stainless steel fasteners per ISO 3506 & ASTM A240 standards. China’s stainless fastener export achieves 18.2% year-on-year growth in Jan-Apr 2026; 316 stainless products stand out against EU CBAM policy cost pressure and become preferred materials for high-corrosion marine projects including offshore platforms and seaside engineering. This article analyzes downstream demand structure, common procurement mistakes and professional material selection advice to help global buyers reasonably configure 304 and 316 fasteners and control full-cycle project costs.

2026-06-04

Stainless Steel 304 Vs 316 Fasteners: Complete Selection Guide for Marine & Harsh Environment

2026-06-03

This authoritative selection guide compares the material composition, mechanical properties, corrosion resistance and application scenarios of 304 (A2) and 316 (A4) stainless steel fasteners based on ISO, DIN and ASTM international standards. It focuses on analyzing the performance differences of the two materials in marine, coastal salt spray and harsh corrosive environments, summarizes accurate selection rules and project life cycle cost analysis, and solves the common selection confusion of global engineers and procurement buyers, providing professional and reliable fastening solutions for industrial and marine engineering projects.

2026-06-03

Green Manufacturing Upgrade, Eco-Friendly Production Process Empowers Global Low-Carbon Fastener Supply

2026-06-02

With the global manufacturing industry accelerating towards low-carbon, environmental protection and sustainable development, green production and eco-friendly product standards have become core assessment indicators for international suppliers. More and more overseas buyers, engineering contractors and brand manufacturers prioritize low-carbon, pollution-free and environmentally compliant fastener products in procurement projects. To adapt to the global green industrial trend and meet the high-standard environmental access requirements of Europe, North America and other mainstream markets, our factory has comprehensively upgraded its green manufacturing system in 2026, optimizing production processes, eliminating high-pollution and high-energy-consuming links, and fully realizing low-emission, high-efficiency and environmentally friendly fastener production, further enhancing the global market competitiveness of our products.

2026-06-02

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We welcome all of you from all over the world to join us for the win-win business partnership and friendship, welcome to China, welcome to Ningbo Topbolt!

China Professional Metal Fasteners

Topbolt - Best Standard Bolts and Nuts for Your Industries

Why Choose Topbolt for Your Projects?

DIGITAL SHOWROOM

Marine Fastener Market Booms in 2026, 304 & 316 Stainless Steel Become Core Preferred Grade Amid Updated IMO Material Standards

Stainless Steel 304 Vs 316 Fasteners: Complete Selection Guide for Marine & Harsh Environment

Green Manufacturing Upgrade, Eco-Friendly Production Process Empowers Global Low-Carbon Fastener Supply

Get A Free Quate

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