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

What Is The ASTM A325 Type 1 Equivalent To?

2025-11-04

Have you ever wondered how essential structural bolts are in construction? These critical components ensure safety and stability in buildings and bridges.This article explores ASTM A325 Type 1, a widely used structural bolt, and its equivalents.

2025-11-04

DIN934 Hex Nut For Machinery And General Assembly

2026-05-25

Technical guide to DIN 934 hex nuts. Learn specifications, grade matching, coatings, and assembly troubleshooting to prevent joint failure.

2026-05-25

DIN985 Nylon Insert Lock Nut Gains Global Order Surge, NINGBO TOPBOLT METALWORKS CO.,LTD. Expands Precision Production Line

2026-06-05

Driven by global new energy vehicle, offshore wind and marine engineering expansion, DIN985 nylon insert self-locking nut market maintains steady 6.3% annual compound growth in 2026. NINGBO TOPBOLT METALWORKS CO.,LTD. launches upgraded intelligent cold forming and nylon pressing workshop, optimizes 304/A2-70、316/A4-80 stainless & high-grade carbon steel production, securing bulk long-term orders from European auto OEMs and Southeast Asian coastal new energy contractors, further lifting China-made anti-vibration fastener global penetration rate.

2026-06-05

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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

What Is The ASTM A325 Type 1 Equivalent To?

DIN934 Hex Nut For Machinery And General Assembly

DIN985 Nylon Insert Lock Nut Gains Global Order Surge, NINGBO TOPBOLT METALWORKS CO.,LTD. Expands Precision Production Line

Get A Free Quate

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