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

2026 Global Structural Fastener Market: Standards, Applications And China’s Supply Advantage

2026-04-27

As global infrastructure investment, industrial manufacturing, and energy projects continue to expand in 2026, structural fasteners have become indispensable core components for engineering safety and operational stability.

2026-04-27

What Is The Difference between Heavy Hex And Regular Hex?

2026-04-28

When buyers compare fasteners, the difference between a heavy hex nut and a regular hex nut may look minor at first glance. Both are six-sided nuts, both thread onto bolts or studs, and both are used to clamp parts together. But in real applications, that small difference in shape and mass can matter a lot. It can affect wrench size, bearing surface, proof load, installation space, and the type of project the fastener is suited for. That is why in structural steel, flange work, and high-strength bolting, the heavy hex nut is often specified instead of a standard or finished hex nut.

2026-04-28

When To Use A Heavy Hex Nut?

2026-04-21

In fastening applications, not every nut is designed for the same job. A standard hex nut may work perfectly well in general hardware, light machinery, or low-stress assemblies. But when the joint must handle higher preload, heavier clamping force, larger bolt diameters, or more demanding structural conditions, engineers and buyers often move to a different option: the heavy hex nut. It may look similar at first glance, but in real-world performance, the difference is meaningful.

2026-04-21

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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

2026 Global Structural Fastener Market: Standards, Applications And China’s Supply Advantage

What Is The Difference between Heavy Hex And Regular Hex?

When To Use A Heavy Hex Nut?

Get A Free Quate

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