Value Collection 39412 Hex Head Cap Screw 1/2-20 X 3 in Grade 8

Product Description

The VALUE COLLECTION 39412 is a 1/2-20 partially threaded hex head cap screw manufactured from Grade 8 steel with a zinc yellow dichromate finish. It measures 3 inches under the head and conforms to ASME B18.2.1 dimensional standards. Grade 8 steel provides high tensile strength suited for demanding mechanical and structural fastening applications. The zinc yellow dichromate coating offers corrosion resistance and is visually identifiable by its characteristic yellow tint. This fastener is installed by millwrights, mechanics, industrial maintenance technicians, and contractors working on equipment assemblies, machinery mounts, and structural connections.

This screw is used in industrial, commercial, and mechanical applications where high-strength fasteners with fine-thread engagement are required. The UNF 1/2-20 thread pitch is common in precision assemblies, automotive, and heavy equipment contexts where vibration resistance and tight thread fit matter. The partial threading allows for shank engagement through clearance holes before thread engagement begins, which is typical in through-bolt and clamping applications. Sold in packages of 25 per the supplier specification.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 1/2-20 UNF thread for fine-pitch, vibration-resistant fastening
• Partially threaded shank allows clearance-hole pass-through before thread engagement
• Zinc yellow dichromate finish provides corrosion resistance and quick visual identification
• Conforms to ASME B18.2.1 dimensional standards
• Packaged in quantities of 25

Compatibility

Designed for use in inch-measurement assemblies requiring a 1/2-20 UNF hex head cap screw with a 3-inch length under the head. Suitable for any application specifying an ASME B18.2.1-compliant Grade 8 fastener in this size.

Installation Notes

Installation should be performed with the appropriate 3/4-inch hex drive socket or wrench sized to the 1/2-inch hex head cap screw standard. Ensure mating tapped holes or nuts match the 1/2-20 UNF thread specification before installation. Apply consistent torque per the applicable equipment service documentation or relevant fastener torque tables for Grade 8 hardware. Inspect threads on both the fastener and the mating component for damage before assembly.