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

Differences and Application Scenarios Between Thick Hex Nuts and Thin Hex Nuts

2026-06-22

Focusing on the selection differences between thick and thin hex nuts, this article takes DIN 934 and DIN 439 industry standards as reference cases, systematically compares their structural characteristics, load-bearing performance, assembly requirements and applicable working conditions, summarizes common foreign trade procurement mistakes and avoidance measures, and clarifies standardized selection rules for main and auxiliary stress scenarios, providing professional guidance for industrial assembly and overseas engineering nut supporting projects.

2026-06-22

Fastener Hydrogen Embrittlement: Principles, Hazards and Prevention Solutions

2026-06-18

This article focuses on the hydrogen embrittlement problem of high-strength electroplated fasteners, explaining its principles, inducing factors and engineering hazards. It classifies hydrogen embrittlement risks for fasteners of different strengths in accordance with international standards, summarizes common procurement mistakes in foreign trade, and provides systematic prevention and process control solutions for fastener selection, quality inspection and engineering application.

2026-06-18

Fastener Surface Treatment Types and Performance Comparison for Industrial Projects

2026-06-17

This article introduces mainstream fastener surface treatment processes, including black oxide, electro-galvanizing, hot-dip galvanizing, Dacromet and Geomet. In line with international standards, it compares coating thickness, cost and applicable working conditions, summarizes common procurement mistakes, and provides scientific process selection guidance for industrial fastener anti-corrosion application and global engineering procurement.

2026-06-17

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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

Differences and Application Scenarios Between Thick Hex Nuts and Thin Hex Nuts

Fastener Hydrogen Embrittlement: Principles, Hazards and Prevention Solutions

Fastener Surface Treatment Types and Performance Comparison for Industrial Projects

Get A Free Quate

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