ASTM A325/A490 Type 1 Heavy Hex Bolts – Heavy-Duty Precision
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ASTM A325/A490 Type 1 Heavy Hex Bolts – Heavy-Duty Precision

At Topbolt Metalworks, we specialize in manufacturing ASTM A325 and A490 Type 1 Heavy Hex Bolts, engineered for the toughest applications. These bolts are available in carbon steel and alloy steel with finishes like hot-dipped galvanized (H.D.G.), zinc plated, and black coatings. Widely used in Buildings,brideg and architectural steel structures, our heavy hex bolts meet strict ASTM standards, ensuring durability and reliability in every project.
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Specifications of ASTM A325/A490 Type 1 Heavy Hex Bolts

Specification

Details

Model No.

A325/A490 Heavy Hex Structural Bolts Type 1

Material

Carbon Steel, Alloy Steel

Type

Hexagon Head

Standard

ASTM A325 TYPE-1,ASTM A490 TYPE-1

Grade

A325 Type 1, A490 Type 1

Finish Options

Plain, Black, Zinc Plated, H.D.G., Dacromet etc

Thread Length

Full Thread or Half Thread

Connection

Common Bolt

Application

Architectural Steel Structures,Buildings,bridges

Certificate

ISO9001:2015

Package Dimensions

25kgs/Carton put to 900kgs/Pallet

Origin

Ningbo, Zhejiang

HS Code

7318150000

Head mark

According to customer requirements

Delivery Time

45-60 days




What Are Heavy Hex Bolts?


Heavy hex bolts are a type of fastener with a larger and thicker head compared to standard hex bolts. Designed for structural applications, they offer higher strength and load-bearing capacity, making them ideal for demanding environments like steel construction.




Why Choose Topbolt’s ASTM A325/A490 Heavy Hex Bolts?

Unmatched Quality Assurance

We follow ISO9001:2015 quality management standards, ensuring every bolt meets stringent quality requirements. From raw material analysis to final inspections, we leave no room for defects.

Global Reach

Our bolts are trusted by industries in North America, Europe, Australia, Russia, Southeast Asia, and the Middle East. With a 15,000 sqm factory and a monthly production capacity of 2,000 tons, we can handle orders of any scale.

Customization at Its Best

We understand that every project has unique requirements. That’s why we offer custom designs, finishes, and packaging to meet your exact needs.




How Are Heavy Hex Bolts Manufactured?

Our manufacturing process ensures precision at every step:

  • Material Selection: We use premium carbon steel or alloy steel for durability.

  • Forging: Bolts are Forged and heat treatment to  achieve the desired shape and strength.

  • Threading: Threads are machined to exact specifications for reliable connections.

  • Finishing: Various coatings are applied, such as H.D.G.,black for added protection.

  • Quality Checks: Each batch undergoes testing for tensile strength, corrosion resistance, and dimensional accuracy.




Difference Between ASTM A325 and ASTM A490 Bolts

  • Material Composition: A325 bolts are made from medium carbon steel, while A490 bolts use alloy steel for higher tensile strength.

  • Applications: A325 bolts are commonly used in structural steel connections, whereas A490 bolts are preferred for higher load-bearing requirements.

  • Finish Options: A490 bolts are not available in hot-dip galvanized coatings due to hydrogen embrittlement concerns.




How to Choose the Right Heavy Hex Bolts?

To select the best heavy hex bolts for your application:

  • Consider Load Requirements: For heavy-load applications, choose A490 bolts.

  • Evaluate Environmental Conditions: Use coated bolts for corrosive environments.

  • Match Specifications: Ensure the bolts meet relevant ASTM or ISO standards for compatibility.




What Makes Topbolt Metalworks Unique?

We combine advanced technology, robust quality systems, and a customer-first ethos to deliver the best heavy hex bolts for every project. Partner with us to experience unmatched reliability and expertise.




What Are the Applications of Heavy Hex Bolts?

Heavy hex bolts are versatile and widely used in:

  • Structural Steel Construction: Securely connecting beams and columns.

  • Machinery: Ensuring stability in high-stress environments.

  • Bridges: Providing critical support in suspension and beam bridges.

  • Industrial Equipment: Enhancing the durability of heavy-duty equipment.




Contact Topbolt Metalworks

Looking for heavy hex bolts tailored to your project? We at Topbolt Metalworks are here to provide expert guidance, high-quality products, and exceptional service. Contact us today to get started:

  • Sales Office: ROOM1-3, No.34 Building 5, Eastern Business Centre, Jiangdong District, Ningbo, China

  • Factory Location: Yuyan, Xiepu Chemical Industrial Zone, Zhenhai District, Ningbo, China

  • Tel: +86-574-86595122

  • Fax: +86-574-86657066

  • Email: sales2@topboltmfg.com

If you're ready to explore our range of ASTM A325/A490 Type 1 Heavy Hex Bolts, or if you have specific requirements, reach out to us. Our team is dedicated to helping you find the perfect solutions for your needs. Let's build a better future together.

Get in touch today!

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WhatsApp: +8618069043038
Telephone: +86-574-86595122
Phone: +86-18069043038
Email: sales2@topboltmfg.com
Address: Yuyan, Xiepu Chemical Industrial Zone, Zhenhai District, Ningbo, China

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