Fractional Sizes High Carbon Steel Grade 8 Hex Tap Bolt with Baked Yellow Cr6 Zinc Plating

Fractional Size High Carbon Steel Grade 8 Hex Tap Bolts with Baked Yellow Cr6 Zinc Plating

Fractional size high carbon steel Grade 8 hex tap bolts are premium, fully threaded fasteners designed for extreme strength and dependable performance in heavy-duty applications. Manufactured from heat-treated high carbon alloy steel, these bolts meet SAE J429 Grade 8 specifications and deliver exceptional tensile strength, clamp load retention, and resistance to shear forces. Finished with baked yellow Cr6 zinc plating, they provide enhanced corrosion protection and the distinctive gold finish associated with high-strength Grade 8 hardware.

What Defines a Grade 8 Hex Tap Bolt?

Grade 8 hex tap bolts are quenched and tempered to achieve superior mechanical properties. Unlike hex cap screws, tap bolts are fully threaded from under the head to the tip, allowing complete thread engagement in tapped holes or when used with nuts.

Key performance characteristics include:

• Minimum tensile strength of approximately 150,000 PSI

• High yield strength for maximum clamping force

• Six radial head markings for grade identification

• Excellent vibration and fatigue resistance

These properties make Grade 8 hex tap bolts ideal for high-load and safety-critical assemblies.

Fractional Sizes and Thread Options

Common Inch Diameters

Available in standard UNC (coarse) and UNF (fine) thread pitches, fractional sizes typically include:

• 1/4"

• 5/16"

• 3/8"

• 1/2"

• 5/8", 3/4", and larger

UNC threads are commonly used in structural steel and equipment manufacturing, while UNF threads provide greater tensile holding power in precision assemblies.

Baked Yellow Cr6 Zinc Plating Advantages

Baked yellow Cr6 zinc plating enhances corrosion resistance while reducing the risk of hydrogen embrittlement through post-plating baking. The yellow chromate finish provides both functional protection and easy visual grade identification.

Benefits include:

• Improved resistance to rust and oxidation

• Durable gold/yellow finish

• Smooth thread engagement for consistent torque

• Added protection for moderate outdoor exposure

Industrial Applications

Fractional size high carbon steel Grade 8 hex tap bolts with baked yellow Cr6 zinc plating are widely used in:

• Heavy equipment and machinery

• Automotive and truck assemblies

• Agricultural and construction equipment

• Structural steel fabrication

• High-stress mechanical systems

Why Choose Grade 8 Hex Tap Bolts?

• Maximum strength for demanding applications

• Full-length threading for superior engagement

• Corrosion-resistant plated finish

• Reliable long-term performance under extreme loads

For high-strength fractional fastening, Grade 8 hex tap bolts with baked yellow Cr6 zinc plating provide durability, compliance, and industrial-grade reliability.