Value Collection 39066 Hex Head Cap Screw 3/8-16 X 4 in Grade 8

Product Description

The VALUE COLLECTION 39066 is a 3/8-16 hex head cap screw designed for high-strength fastening applications where dependable clamping force and corrosion resistance are required. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener meets the dimensional and mechanical requirements of ASME B18.2.1. The 4-inch length under head and UNC thread form make it suitable for through-bolt and tapped-hole assemblies across a range of industrial and mechanical applications. Partial threading along the shank provides a smooth grip section, which helps resist lateral shear forces in bolted joints. This screw is sold in a package of 25.

This cap screw is commonly used in mechanical assemblies, structural brackets, equipment mounts, and general industrial fabrication where a Grade 8 strength rating is specified. The zinc yellow dichromate finish provides moderate corrosion protection suitable for indoor and light-exposure environments. HVAC equipment mounting, electrical panel supports, and plumbing system brackets are among the trade applications where this fastener size and grade are frequently specified. Installation is performed by licensed tradespeople and maintenance technicians using standard hand or power tools.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• Zinc yellow dichromate finish for corrosion resistance
• Partial threading preserves a smooth shank section to resist shear loads
• Conforms to ASME B18.2.1 dimensional standards
• UNC (Unified National Coarse) thread form, 3/8-16
• Sold as a 25-piece package with a minimum order quantity of 1

Compatibility

Designed as a standard UNC hex head cap screw for use in any application requiring a 3/8-16 thread, 4-inch length under head, and Grade 8 steel fastener per ASME B18.2.1.

Installation Notes

Install using the appropriately sized hex wrench or socket driver rated for Grade 8 fasteners. Ensure mating threads are clean and free of debris before assembly. De-energize and isolate any equipment or system before fastening work begins in electrical or mechanical enclosures. Do not substitute a lower-grade fastener in an application that specifies Grade 8 hardware.