Value Collection D39004 1/4-20 X 1 in Grade 8 Hex Cap Screw

Product Description

The VALUE COLLECTION D39004 is a fully threaded hex head cap screw in the 1/4-20 UNC thread size with a 1-inch length under head. Manufactured from Grade 8 steel and finished with a zinc yellow dichromate coating, this fastener is built for high-strength bolted assemblies where corrosion resistance and tensile performance are both required. Grade 8 steel carries a higher proof load and tensile strength than Grades 2 or 5, making it appropriate for structural, mechanical, and equipment-mounting applications. The zinc yellow dichromate finish adds a layer of corrosion protection while providing a visible indicator of the Grade 8 classification. Compliance with ASME B18.2.1 and SAE J429 ensures dimensional and mechanical conformance to recognized industry standards.

This fastener is suited for general industrial, maintenance, and mechanical assembly work where high-strength inch-series hardware is specified. Common applications include securing machine components, equipment frames, brackets, and structural connections that require a fully threaded grip. The 1/4-20 UNC thread pattern is one of the most widely used coarse-thread sizes in trade and industrial settings, compatible with standard nuts, inserts, and tapped holes of the same specification. The minimum order quantity is 50 pieces per order.

Key Features

• Grade 8 steel construction for high proof load and tensile strength
• Fully threaded body along the full 1-inch length under head
• Zinc yellow dichromate finish for corrosion resistance and grade identification
• 1/4-20 UNC coarse thread standard for broad tooling and hardware compatibility
• Meets ASME B18.2.1 dimensional standards and SAE J429 mechanical property requirements

Compatibility

Designed as a standard inch-series hex head cap screw for use with 1/4-20 UNC nuts, threaded inserts, and tapped holes conforming to UNC coarse-thread specifications.

Installation Notes

Installation is typically performed by mechanics, maintenance technicians, or electricians using a standard hex wrench or socket driver sized for the 1/4-inch hex head. Ensure the mating thread is clean and free of debris before engagement. Do not exceed the rated torque for the Grade 8 fastener class and the material being fastened. Inspect the zinc coating for damage before installation in corrosive environments.