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

How To Match HDG U Bolt Sizes To Pipe Outer Diameter

2026-07-15

1. IntroductionIn pipeline installation, bracket fixing and mechanical equipment assembly, mismatched U bolt and pipe diameter is one of the most common on-site construction errors. Many overseas engineering teams and procurement staff often encounter problems such as loose clamping, pipe deformatio

2026-07-15

DIN6914 & DIN6915 HV Structural Bolt & Nut Complete Matching Guide

2026-07-14

1. IntroductionDIN6914 wide across flats high-strength bolts and matched DIN6915 heavy hex nuts form the standard HV preloaded connection system for European steel construction. Widely accepted mass production versions are DIN 6914:1989 and DIN 6915:1999, compliant with DIN 18800 steel structure des

2026-07-14

YJT 3020 M6-M12 Carbon Steel Spring Nut Full Sourcing Guide

2026-07-13

1. IntroductionYJT 3020 spring nuts are special elastic fasteners for standard C strut channels, with mainstream mass production sizes M6, M8, M10 and M12. Carbon steel versions are the most widely used basic accessories for solar brackets, electrical cabinets and HVAC pipe supports.YJT 3020 M6-M12

2026-07-13

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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

How To Match HDG U Bolt Sizes To Pipe Outer Diameter

DIN6914 & DIN6915 HV Structural Bolt & Nut Complete Matching Guide

YJT 3020 M6-M12 Carbon Steel Spring Nut Full Sourcing Guide

Get A Free Quate

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