Grade 8 Fasteners - Yellow Zinc

Flat Washers SAE Thru Hardened Yellow Zinc

Nylon Insert Lock Nuts Grade C Yellow Zinc

Hex Finish Nuts Grade 8 Yellow Zinc UNC

Split Ring Lock Washers Grade 8 Yellow Zinc

Flat Washers USS Thru Hardened Yellow Zinc

Flat Washers Extra Thick Grade 8 Yellow Zinc

Hex Cap Screws Grade 8 Yellow Zinc 3/8-16"

Hex Cap Screws Grade 8 Yellow Zinc 1/4-20"

Hex Cap Screws Grade 8 Yellow Zinc 5/16-18"

Hex Cap Screws Grade 8 Yellow Zinc 1/2-13"

Hex Finish Nuts Grade 8 Yellow Zinc UNF

Hex Cap Screws Grade 8 Yellow Zinc 7/16-14"

Flat Washers SAE Thru Hardened Yellow Zinc - American Made

Hex Cap Screws Grade 8 Yellow Zinc 1/4-28"

Hex Cap Screws Grade 8 Yellow Zinc 5/8-11"

Hex Cap Screws Grade 8 Yellow Zinc 7/16-20"

Hex Cap Screws Grade 8 Yellow Zinc 3/8-24"

Hex Cap Screws Grade 8 Yellow Zinc 5/16-24"

Hex Cap Screws Grade 8 Yellow Zinc 1/2-20"

Hex Cap Screws Grade 8 Yellow Zinc 5/8-18"

Hex Cap Screws Grade 8 Yellow Zinc 3/4-10"

Flat Washers USS Thru Hardened Yellow Zinc - American Made

High Collar Lock Washer Grade 8 Yellow Zinc

Hex Cap Screws Grade 8 Yellow Zinc 9/16-18"

Hex Finish Nuts USA Made Grade 8 Yellow Zinc UNC

Hex Cap Screws Grade 8 Yellow Zinc 3/4-16"

Hex Cap Screws Grade 8 Yellow Zinc 9/16-12"

Hex Finish Nuts USA Made Grade 8 Yellow Zinc UNF

Hex Cap Screws Grade 8 Yellow Zinc 1-8"

Hex Cap Screws Grade 8 Yellow Zinc 7/8-9"

Hex Cap Screws Grade 8 Yellow Zinc 1-1/4-7"

Hex Cap Screws Grade 8 Yellow Zinc 7/8-14"

Hex Cap Screws Grade 8 Yellow Zinc 1-14"

Hex Cap Screws Grade 8 Yellow Zinc 1-1/8-7

Hex Cap Screws Grade 8 Yellow Zinc 1-1/2-6"

Grade 8 Fasteners: High-Strength Yellow Zinc Solutions

Grade 8 fasteners represent the highest-strength standard in SAE J429 specifications, offering exceptional performance with a distinctive yellow zinc finish. These premium fasteners are manufactured from medium carbon alloy steel, quenched and tempered to achieve a minimum tensile strength of 150,000 PSI, making them ideal for critical applications where maximum strength and reliability are essential.

Our comprehensive selection includes Grade 8 bolts, nuts, washers, and screws, all featuring the characteristic yellow zinc plating that not only provides superior corrosion protection but also serves as a visual indicator of their high-strength classification. Each fastener is marked with six radial lines on the head, ensuring easy identification and proper specification compliance.

Key Features and Benefits

Superior Strength: 150,000 PSI minimum tensile strength
Enhanced Corrosion Protection: Yellow zinc plating offers 2-3x more corrosion resistance than clear zinc
Easy Identification: Distinctive yellow finish and six radial head markings
Quality Assurance: Meets or exceeds SAE J429 Grade 8 specifications
Versatile Applications: Ideal for high-stress and critical assembly requirements

Material and Performance Specifications

Material Properties:

Medium carbon alloy steel, quenched and tempered
Core hardness: Rockwell C33-C39
Proof load strength: 120,000 PSI
Yellow zinc plating with hexavalent chromate conversion coating

Salt Spray Performance:

Up to 96 hours salt spray resistance
Superior protection compared to clear zinc finishes
Self-healing properties for enhanced durability

Common Applications

Automotive and Heavy Equipment:

Suspension systems
Engine mounting
Chassis components
Drivetrain assemblies

Industrial Applications:

Heavy machinery assembly
Structural connections
High-stress mounting points
Critical equipment installation

Product Selection Guide

Grade 8 Bolts and Screws

Available in hex head and socket head styles
Coarse and fine thread options
Sizes from 1/4" through 1-1/2"
Multiple length options

Grade 8 Nuts

Heavy hex and finished hex styles
Compatible with Grade 8 bolts
Through-hardened for maximum strength
Yellow zinc plated for corrosion resistance

Frequently Asked Questions

What makes Grade 8 fasteners different from other grades?

Grade 8 fasteners are made from medium carbon alloy steel and heat-treated to achieve the highest strength rating in the SAE J429 specification (150,000 PSI minimum tensile strength). They feature six radial lines on the head and typically come with yellow zinc plating for enhanced corrosion protection.

Why are Grade 8 fasteners yellow?

The yellow color comes from a specialized zinc plating process with a yellow chromate conversion coating. This finish provides superior corrosion protection compared to clear zinc plating and serves as a visual identifier for high-strength Grade 8 fasteners.

Can Grade 8 fasteners be used in all applications?

While Grade 8 fasteners offer superior strength, they may not be the best choice for all applications. They are typically used in high-stress situations requiring maximum strength and should be installed to proper torque specifications. For general-purpose applications, Grade 5 fasteners may be more cost-effective.

What's the difference between yellow zinc and clear zinc plating?

Yellow zinc plating includes an additional chromate conversion coating that provides 2-3 times more corrosion resistance than clear zinc plating. The yellow finish also helps identify high-strength fasteners, as most Grade 8 fasteners use this distinctive coating.