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

DIN975 vs DIN976 Threaded Rod: Size, Tolerance & Usage Difference

2026-08-12

1. IntroductionFull threaded rods are indispensable general fasteners for architectural suspension, pipeline support, mechanical assembly and steel structure connection. In European and international procurement markets, DIN975 and DIN976 are the two most common German standard full-thread bar speci

2026-08-12

10.9S Torsion Shear High Strength Structural Bolt Assembly GBT3632-2018 Complete Set.png

What Is 10.9S Torsion Shear Bolt? Standard & Construction Guide

2026-08-11

1. IntroductionIn modern steel structure engineering, connection quality directly determines the overall safety, stability and service life of buildings and infrastructure. Among all structural fasteners, 10.9S torsion shear bolts stand out as professional high-strength connecting parts specially de

2026-08-11

DIN935-1-2013 Hex Slotted Castle Nut Grade AB.png

DIN935 Castle Nut: Cotter Pin Matching & Permanent Vibration Locking Guide

2026-08-10

1. IntroductionDIN935 castle nuts, also known as slotted hex nuts, are specialized mechanical locking fasteners designed for permanent anti-loosening and high-vibration working conditions. Different from ordinary hex nuts and nylon lock nuts, DIN935 adopts a unique top multi-slot open structure, whi

2026-08-10

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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

DIN975 vs DIN976 Threaded Rod: Size, Tolerance & Usage Difference

What Is 10.9S Torsion Shear Bolt? Standard & Construction Guide

DIN935 Castle Nut: Cotter Pin Matching & Permanent Vibration Locking Guide

Get A Free Quate

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