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

Request A Quote

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

Gangtong Zheli Fastener: 15+ Years of Excellence in Global Fastener Manufacturing & Supply

2026-05-29

This official news from Gangtong Zheli Fastener introduces our company’s development strength, product lines, quality management and global service capabilities. With over 15 years of professional experience in the fastener industry, we are a leading manufacturer and exporter based in Ningbo, China, integrating R&D, production, quality inspection and global distribution. Our product range covers hex bolts, nuts, screws, washers, anchor bolts and customized non-standard fasteners, all compliant with ISO, DIN, ANSI and other international standards. Equipped with advanced production and testing equipment, we implement full-process quality control and have obtained ISO 9001, CE and RoHS certifications. We serve clients across more than 80 countries, supplying high-quality fasteners for construction, automotive, new energy, heavy machinery and other industries. Adhering to the principles of experience, expertise, authoritativeness and trustworthiness, we provide OEM, ODM and one-stop custo

2026-05-29

Gangtong Zheli Fasteners Launches Comprehensive Green Manufacturing & Sustainability Initiative To Lead Low‑Carbon Development in The Global Fastener Industry

2026-05-28

Gangtong Zheli Fasteners, a trusted industrial fastener manufacturer and global exporter, officially launches a full‑scope green manufacturing and sustainability initiative. This long‑term strategic program covers energy saving, emission reduction, waste recycling, eco‑friendly surface treatment, responsible material sourcing and low‑carbon logistics. By integrating environmental protection into production, management and supply chain operations, the company strengthens its Experience, Expertise, Authoritativeness and Trustworthiness (EEAT) while providing global customers with reliable, compliant and low‑carbon industrial fasteners, including bolts, nuts, screws, washers and custom fastening solutions.

2026-05-28

What is the difference between DIN933 and DIN931 hex bolts.png

Gangtong Zheli Fasteners Strengthens In-House Laboratory & Full-Range Product Testing To Elevate Global Product Reliability

2026-05-26

Gangtong Zheli Fasteners, a trusted manufacturer and exporter of industrial fasteners across global markets, announces the comprehensive upgrade and expansion of its professional quality testing laboratory. This initiative optimizes testing equipment, enriches inspection items and standardizes full-process quality control workflows. By reinforcing scientific detection capabilities and strict compliance with international standards, the company further solidifies its Experience, Expertise, Authoritativeness and Trustworthiness (EEAT), delivering more dependable bolts, nuts, screws, washers and custom fasteners to worldwide industrial clients.

2026-05-26

Get A Free Quate

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

Gangtong Zheli Fastener: 15+ Years of Excellence in Global Fastener Manufacturing & Supply

Gangtong Zheli Fasteners Launches Comprehensive Green Manufacturing & Sustainability Initiative To Lead Low‑Carbon Development in The Global Fastener Industry

Gangtong Zheli Fasteners Strengthens In-House Laboratory & Full-Range Product Testing To Elevate Global Product Reliability

Get A Free Quate

Quick Links

Fasteners

Contact Us

Join Our Newsletter