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

Metric vs Inch Fastener: Global Standard Matching Guide for Overseas Projects

2026-09-14

This article focuses on the most serious assembly errors in foreign trade fastener procurement: metric and inch standard mixing and thread mismatch. It systematically explains the essential differences in calibration system, thread pitch and size tolerance between metric and inch fasteners, summarizes high-frequency assembly pitfalls and overseas regional standard rules, and provides practical identification and procurement specifications for overseas engineering project fastener matching.

2026-09-14

304 VS 316 Stainless Steel Fastener: Salt Spray & Service Life Difference

2026-09-11

This article focuses on the high-frequency selection pain points of 304 and 316 stainless steel fasteners for overseas marine and chemical projects. It compares material composition, salt spray resistance and service life differences, divides accurate working condition boundaries for inland, coastal, seawater and chemical environments, summarizes common procurement pitfalls, and provides high-conversion material matching guidelines for overseas industrial and marine engineering procurement.

2026-09-11

Hot Dip Galvanized vs Electro Galvanized Fastener: Salt Spray Life Gap

2026-09-10

This article targets the biggest foreign trade procurement misunderstanding that hot-dip galvanized and electro-galvanized fasteners have similar appearances but vastly different performance. It systematically compares the two processes in terms of production principle, coating structure, salt spray life, assembly accuracy and engineering cost, intuitively analyzing the 10-fold anti-corrosion life gap, and providing accurate scenario selection standards and procurement avoidance guidelines for overseas engineering fastener matching.

2026-09-10

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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

Metric vs Inch Fastener: Global Standard Matching Guide for Overseas Projects

304 VS 316 Stainless Steel Fastener: Salt Spray & Service Life Difference

Hot Dip Galvanized vs Electro Galvanized Fastener: Salt Spray Life Gap

Get A Free Quate

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