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

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Why Anti-Loosening Fasteners Become Standard Configuration for Global Engineering in 2026

2026-05-11

In 2026 and the future, safety and durability will always be the core appeal of fastener procurement. Anti-loosening fasteners will continue to expand their application scope in machinery, steel structure, new energy and outdoor engineering. Stable quality, complete specifications and reliable anti-loosening performance will become the key competitiveness of fastener suppliers. GTZL will continue to enrich anti-loosening product series, and provide one-stop stable supporting solutions for global engineering and industrial customers.

2026-05-11

O1CN01zMzhB11Y22vs276Ew_!!2771103000-0-cib.jpg

Stainless Steel Fastener Industry News: Demand Surges in New Energy & Overseas Markets Accelerate Layout

2026-05-08

In the second quarter of 2026, the stainless steel fastener industry maintains a strong growth momentum. Driven by booming demand in new energy, marine engineering, and overseas infrastructure, the market scale continues to expand, while leading enterprises accelerate global layout and product upgrading, opening a new chapter of high-quality development.

2026-05-08

Why Global Buyers Choose Ningbo Gangtong Zheli Fasteners in 2026

2026-04-29

Looking ahead, the company will continue to focus on high‑strength fasteners, quality upgrading, and customer satisfaction. As global infrastructure and industrial demand grow, Gangtong Zheli Fasteners will reinforce its position as a reliable China fastener supplier, providing safe, durable, and cost‑effective fastening solutions for the world.

2026-04-29

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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

Why Anti-Loosening Fasteners Become Standard Configuration for Global Engineering in 2026

Stainless Steel Fastener Industry News: Demand Surges in New Energy & Overseas Markets Accelerate Layout

Why Global Buyers Choose Ningbo Gangtong Zheli Fasteners in 2026

Get A Free Quate

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