UNC Hex Bolt Grade 8 Zinc Plated

ASME B18.2.1 | High Strength | Coarse Thread | NZ

When strength matters, step up to Grade 8.

These UNC hex bolts (1/4"-20) are manufactured to ASME B18.2.1 standard and designed for high-strength fastening in demanding automotive, mechanical, and structural applications. The coarse (UNC) thread provides fast installation and reliable performance across a wide range of materials.

Made from Grade 8 steel, these bolts offer significantly higher tensile strength than standard fasteners, making them ideal for load-critical applications. The zinc-plated, blue passivated (A2K) finish adds corrosion resistance for everyday use.

More strength. More confidence. Built for critical jobs.

Why We Use Them in the Workshop

• Grade 8 high tensile strength for demanding applications
• Reliable performance under load
• UNC thread for fast installation and versatility
• Zinc-plated for corrosion resistance
• Consistent quality to ASME standard
• Suitable for automotive and engineering use

Key Features

• Standard: ASME B18.2.1
• Material: Steel
• Grade: 8 (high strength)
• Finish: Zinc plated, blue passivated (A2K)
• Head Type: Hexagon
• Thread Type: UNC (coarse thread)
• Thread Design: Full thread
• RoHS Compliant: Yes

Ideal For

• Automotive and performance applications
• Structural fastening
• Machinery and heavy equipment
• Engineering and fabrication work
• Workshop and trade use

Built for High Strength Applications

These Grade 8 bolts NZ workshops rely on deliver maximum strength and reliability — ideal for applications where failure is not an option.