Industrial SAE J429 G5 & G8 Hex Head Bolts
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Industrial SAE J429 G5 & G8 Hex Head Bolts

At Topbolt Metalworks, we specialize in manufacturing high-strength SAE J429 G5 & G8 Hex Head Bolts for a wide range of industries. With a reputation for exceptional quality and strict compliance with global standards, our hex head bolts are trusted by clients worldwide for applications in construction, oil pipelines, machinery, and more.
With advanced production lines, rigorous quality control, and a commitment to customization, we ensure every bolt meets your exact specifications. Whether you need a reliable supplier for standard fasteners or custom solutions, we’re here to help.
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Product Details: SAE J429 G5 & G8 Hex Head Bolts

Specifications

  • Material: Carbon steel, alloy steel, or stainless steel

  • Standards: SAE J429 Grade 5 & Grade 8 compliance

  • Sizes Available: Ranges from M6 to M24 (custom sizes available)

  • Finish Options: Zinc-plated, hot-dip galvanized, plain finish

  • Applications: Architectural steel structures, bridges, oil pipelines, machinery, furniture, vessels, and railways

Features

  • High tensile strength for demanding applications

  • Corrosion-resistant finishes for extended lifespan

  • Precise thread geometry for secure fastening

  • Compatible with a variety of nuts and washers




How SAE J429 G5 & G8 Bolts Are Manufactured

Our bolts are produced using a systematic process to ensure strength, durability, and accuracy:

Raw Material Selection

We start with high-grade materials, including carbon and alloy steel, to meet SAE J429 specifications.

Forging and Heat Treatment

Bolts are hot forged for structural integrity and then heat-treated to achieve the required tensile strength.

Threading and Surface Finishing

Threads are machined with precision to match international standards, followed by surface treatments for corrosion resistance.

Quality Assurance

Every bolt undergoes rigorous testing, including tensile strength tests, hardness checks, and dimensional accuracy inspections.




Difference Between SAE J429 Grade 5 and Grade 8 Bolts

Feature

Grade 5

Grade 8

Tensile Strength

Up to 120,000 PSI

Up to 150,000 PSI

Application

Medium-strength general use

High-stress industrial use

Marking

3 radial lines on the head

6 radial lines on the head

Grade 5 bolts are ideal for moderate-load applications, while Grade 8 bolts are better suited for heavy-duty or high-load scenarios.




Why Choose Topbolt Metalworks?

Quality Assurance

We adhere to ISO9001:2000 standards, ensuring that every bolt meets your expectations. Any issue is resolved promptly using an 8D reporting process.

Customization Services

Need non-standard bolts? We offer OEM/ODM solutions, tailoring products to your specific needs.

Global Export Expertise

Serving clients in North America, Europe, Australia, and more, we understand the demands of international markets and deliver on time.

Competitive Pricing

As a manufacturer, we provide factory-direct prices without compromising on quality.






What is DIN 127 and Its Relevance to Fasteners?

DIN 127 refers to a specific standard for spring washers, commonly used alongside hex head bolts. These washers enhance the fastening system by:

  • Preventing loosening due to vibrations

  • Distributing load evenly to protect the material

  • Increasing the overall lifespan of the assembly

At Topbolt, we offer a variety of washers, including DIN 127 models, to complement our bolts and ensure a secure fastening solution.




FAQ

What is the difference between hex head and other bolt types?

Hex head bolts feature a six-sided head for enhanced grip and torque. They’re ideal for structural applications where secure fastening is critical.

Can I order custom bolt sizes?

Yes, we offer custom sizes and specifications to meet your unique requirements.

What industries use SAE J429 G5 & G8 bolts?

These bolts are widely used in construction, machinery, oil pipelines, and other heavy-duty applications requiring high tensile strength.

How do you ensure product quality?

We follow ISO9001:2000 standards and conduct thorough inspections at every production stage.

Do you provide samples?

Yes, samples are available upon request. Contact us to discuss your needs.




Contact Topbolt Metalworks Today!

Ready to source high-quality SAE J429 G5 & G8 Hex Head Bolts?

Reach out to us for quotes, product details, or any questions:

  • 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

Discover the Topbolt difference. Let’s build a strong partnership 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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