Value Collection 30039 5/16-18 X 3-1/2 in Hex Cap Screw Gr5

Product Description

The VALUE COLLECTION 30039 is a Grade 5 steel hex head cap screw sized 5/16-18 x 3-1/2 inches, finished with a zinc plating for corrosion resistance. It features a partially threaded shank and a standard UNC thread form, conforming to ASME B18.2.1. This fastener is measured length-under-head and is suited for general mechanical assembly, structural connections, and equipment fabrication. It is installed by HVAC technicians, plumbers, electricians, and general tradespeople wherever a reliable, mid-strength threaded fastener is required. Each package contains 100 pieces.

This screw is appropriate for a wide range of trade applications including securing equipment panels, mounting brackets, and joining structural members in both residential and light commercial settings. The 5/16-18 UNC thread and 3-1/2 inch length make it a common choice for through-bolting thicker assemblies where partial threading is needed to bear shear load at the shank. The zinc-plated finish provides adequate protection in dry or mildly corrosive environments. Grade 5 tensile strength makes this suitable for most standard mechanical load requirements without over-engineering the fastener selection.

Key Features

• 5/16-18 UNC thread size with partially threaded shank for shear-load applications
• 3-1/2 inch length measured under head per ASME B18.2.1 standard
• Grade 5 steel construction for mid-range tensile strength in mechanical assemblies
• Zinc-plated finish for corrosion resistance in dry and mildly exposed environments
• Conforms to ASME B18.2.1 dimensional standard
• Sold in a package of 100 pieces, minimum order quantity of 1

Compatibility

Designed as a standard UNC hex head cap screw for general trade and mechanical assembly applications where a 5/16-18 x 3-1/2 inch Grade 5 partially threaded fastener is specified.

Installation Notes

Install using a standard hex wrench, socket, or open-end wrench sized for a 5/16-inch hex head cap screw. Ensure the mating nut or tapped hole matches the 5/16-18 UNC thread standard. De-energize and lock out any equipment before fastening or removing hardware on electrical, mechanical, or HVAC assemblies. Do not substitute this Grade 5 fastener in applications that specify Grade 8 or metric property class equivalents.