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

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

3ea86d948d214c54ee37d4be548acb63tplv-be4g95zd3a-image.jpeg

DIN6923 Hex Flange Nut: Serrated And Non‑Serrated Version Difference

2026-08-07

1. IntroductionDIN6923 hex flange nuts are one-piece integrated fasteners combining a standard hex nut and a large flange washer. Different from ordinary DIN934 hex nuts, the integrated flange design eliminates the need for separate flat washers, effectively enlarging the compression area and disper

2026-08-07

DIN186 Square Neck T-Head Bolt Heavy Duty T-Slot Bolt.png

DIN186 T-Head Bolt Complete Guide: Dimension, T-slot Matching & Installation Rules

2026-08-06

1. IntroductionDIN186 T-head bolts with square neck are specialized industrial fasteners designed for T-slot worktables, machine tool fixtures, and modular equipment clamping systems. Different from ordinary hex bolts and carriage bolts, DIN186 features a unique square neck and thick T-shaped head,

2026-08-06

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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

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

DIN6923 Hex Flange Nut: Serrated And Non‑Serrated Version Difference

DIN186 T-Head Bolt Complete Guide: Dimension, T-slot Matching & Installation Rules

Get A Free Quate

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