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

U-Bolt For Marine & Trailer: Anti-Corrosion Matching Guide

2026-09-04

This article focuses on the application of U-bolts in marine equipment and trailer suspension systems, analyzes the environmental characteristics of salt spray corrosion, vibration and heavy load working conditions, compares the performance differences and scenario boundaries between hot-dip galvanized and stainless steel U-bolts, summarizes professional selection standards, standardized installation and anti-corrosion maintenance guidelines, providing reliable procurement and construction reference for marine engineering and trailer supporting projects.

2026-09-04

Custom Special Shaped Fastener: Drawing Processing & Tolerance Rule

2026-09-03

This article systematically introduces the classification, standardized processing flow and drawing specification rules of custom special‑shaped non‑standard fasteners, summarizes common customization pitfalls and targeted avoidance solutions, sorts out optional materials and surface processes, and provides professional and standardized whole‑process guidance for overseas equipment customization, engineering non‑standard supporting and precision part procurement.

2026-09-03

DIN557 Square Nut: Flat Surface Connection & Anti-Rotation Advantage

2026-09-02

1. IntroductionDIN557 square nut is a specialized four-sided standard fastener widely used in European industrial and construction fields. Different from conventional hexagonal nuts, its unique square structure delivers natural anti-rotation performance and larger flat bearing area, solving common a

2026-09-02

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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

U-Bolt For Marine & Trailer: Anti-Corrosion Matching Guide

Custom Special Shaped Fastener: Drawing Processing & Tolerance Rule

DIN557 Square Nut: Flat Surface Connection & Anti-Rotation Advantage

Get A Free Quate

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