Built for Strength. Engineered for Precision.

These Grade 5 UNF hex head bolts are manufactured to ASME B18.2.1 standards and designed for reliable fastening in automotive, fabrication, engineering, machinery, restoration, and general workshop applications.

Manufactured from Grade 5 steel with a zinc-plated blue passivated finish (A2K), they provide dependable strength and corrosion protection for indoor and general outdoor use.

The UNF (Unified National Fine) thread provides greater thread engagement and improved clamping force than coarse-thread alternatives, making these bolts a popular choice for motorsport, performance vehicles, machinery, and precision engineering applications.

Available in a range of imperial sizes to suit automotive, fabrication, and engineering projects.

Why We Use Them in the Workshop

• Grade 5 high-strength steel construction
• UNF fine thread for improved clamping force
• Zinc-plated blue passivated finish for corrosion resistance
• Suitable for automotive, fabrication, and engineering applications
• Compatible with standard UNF nuts and washers
• Reliable workshop-quality imperial fasteners
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Product Details

• Standard: ASME B18.2.1
• Material: Grade 5 Steel
• Finish: Zinc Plated, Blue Passivated (A2K)
• Thread Type: UNF (Fine Thread)
• Head Type: Hex Head

Ideal For

• Automotive repairs
• Performance and motorsport vehicles
• Fabrication projects
• Engineering applications
• Machinery assembly
• Restoration work
• General workshop use

Built for Everyday Performance

Whether you're replacing worn fasteners, assembling machinery, restoring a classic vehicle, or completing a fabrication project, these Grade 5 UNF hex head bolts deliver the strength, reliability, and precision professionals expect.

Looking for UNF bolts near you? Shores NZ Fabrication stocks a growing range of imperial fasteners available online and from our Henderson, Auckland workshop.