Value Collection 39038 Hex Cap Screw 5/16-18 Grade 8 Zinc 50pk

Product Description

The VALUE COLLECTION 39038 is a Grade 8 steel hex head cap screw sized 5/16-18 x 3-1/4 inches, supplied in a pack of 50. It features a zinc yellow dichromate finish that provides corrosion resistance for demanding fastening applications. The screw is partially threaded and conforms to ASME B18.2.1 dimensional standards, making it a reliable choice for high-strength bolted joints in structural, mechanical, and equipment assembly work. The Unified National Coarse (UNC) thread form ensures broad compatibility with standard 5/16-18 tapped holes and nuts. Electricians, HVAC technicians, plumbers, and general contractors reach for Grade 8 hardware where tensile strength and dimensional consistency are required.

These cap screws suit a wide range of trade and light industrial applications including equipment mounting, panel assembly, structural bracketing, and mechanical joint work. The zinc yellow dichromate coating helps resist oxidation in moderately corrosive environments. Supplied in a 50-piece pack, the 39038 works well for service vans stocking high-strength inch-series fasteners. The ASME B18.2.1 standard governs hex cap screw dimensions, ensuring consistent fit with standard hardware and tooling.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• Zinc yellow dichromate finish for corrosion resistance
• Partially threaded shank in 5/16-18 UNC thread form
• Conforms to ASME B18.2.1 dimensional standard
• 3-1/4 inch length under head for longer grip applications
• Supplied in a 50-piece pack with a minimum order quantity of 1 pack

Compatibility

Designed for use with standard 5/16-18 UNC tapped holes, nuts, and threaded inserts in inch-series fastening applications where Grade 8 strength is specified.

Installation Notes

Installation should be performed by a qualified tradesperson using the appropriate hex drive socket or wrench sized for a 5/16-18 hex cap screw. Always verify that the mating thread and material are rated to accept Grade 8 fastener loads before torquing. Do not mix Grade 8 hardware with lower-grade nuts or tapped materials that cannot sustain the associated clamp load. Follow applicable codes and equipment manufacturer torque specifications for the joint being assembled.