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

ISO 4017 Fully Threaded Hex Head Bolt.png

ISO4014-ISO4017 Mixed Use: What Assembly Conditions Are Prohibited

2026-08-26

1. IntroductionISO4014 (partial-thread hex bolt) and ISO4017 (full-thread hex bolt) are the two most commonly used metric fasteners in global mechanical assembly, steel structure engineering, and equipment manufacturing. They share identical head size, thread pitch, strength grade, and mounting tool

2026-08-26

ISO 4014 Hex Head Bolt Partial Thread.png

ISO4014 Bolt Grade A / B / C: Tolerance Class Difference & Project Matching

2026-08-25

1. IntroductionISO 4014 is the globally recognized standard for partial-thread hexagon head bolts, widely used in mechanical manufacturing, industrial equipment, steel structures, and automation engineering. Many global buyers only focus on bolt size, length, and strength grade (8.8, 10.9, A2-70) bu

2026-08-25

DIN557 Square Nut: Feature And Matching Fastener Solutions

2026-08-24

1. IntroductionDIN557 square nut is a standard metric four-sided fastener widely adopted in European industrial and construction fields. Different from conventional hexagonal nuts, its unique square structural design delivers outstanding anti-rotation performance, larger contact bearing area and exc

2026-08-24

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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

ISO4014-ISO4017 Mixed Use: What Assembly Conditions Are Prohibited

ISO4014 Bolt Grade A / B / C: Tolerance Class Difference & Project Matching

DIN557 Square Nut: Feature And Matching Fastener Solutions

Get A Free Quate

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