Value Collection 39312 Hex Head Cap Screw 1/4-28 X 3 in Grade 8

Product Description

The VALUE COLLECTION 39312 is a 1/4-28 UNF hex head cap screw engineered for high-strength fastening applications. Built from Grade 8 steel with a zinc yellow dichromate finish, this screw delivers superior tensile strength and corrosion resistance compared to lower-grade hardware. The partial threading design is standard for longer fasteners, allowing the unthreaded shank to bear shear loads while the threaded section engages the nut or tapped hole. At 3 inches in length under head and measuring 1/4-28 thread pitch, this screw meets ASME B18.2.1 dimensional standards. Sold in a pack of 50, it suits production environments and contractors who require consistent, spec-grade hardware on hand.

This fastener is used across a wide range of trade applications including HVAC equipment assembly, mechanical brackets, electrical enclosure mounting, and general structural fastening in both residential and commercial settings. The 1/4-28 UNF thread is common in precision mechanical assemblies where fine thread engagement and vibration resistance are required. Grade 8 hardware is typically specified by engineers and tradespeople when a SAE Grade 5 fastener does not meet the load requirements of the joint.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 1/4-28 UNF thread standard for fine-pitch, vibration-resistant engagement
• 3-inch length under head with partial threading for shear load capability
• Zinc yellow dichromate finish provides corrosion and oxidation resistance
• Conforms to ASME B18.2.1 dimensional standards
• Sold in a 50-piece pack to support job-site and production quantities

Compatibility

Designed as a standard 1/4-28 UNF hex head cap screw per ASME B18.2.1, compatible with any application calling for a Grade 8 partially threaded fastener in that thread size and length.

Installation Notes

Installation is performed with a standard hex wrench or socket set sized to the 1/4-inch hex head. Follow the joint designer's torque specification for Grade 8 fasteners in the applicable material; do not apply torque values from lower-grade fastener charts. Ensure the mating thread or nut is also rated to Grade 8 or higher to avoid fastener yielding. Avoid reusing fasteners that have been torqued to yield or show thread damage.