Value Collection D30170-51/2 Hex Cap Screw Grade 5 Zinc

Product Description

The VALUE COLLECTION D30170-51/2 is a partially threaded hex head cap screw designed for heavy-duty fastening in structural and mechanical assemblies. Manufactured from Grade 5 steel with a zinc-plated finish, this screw delivers reliable clamping force and corrosion resistance in demanding trade applications. It features a 1-8 UNC thread size and a 5.5-inch length under head, conforming to ASME B18.2.1 and SAE J429 standards. Plumbers, pipefitters, HVAC technicians, and general contractors rely on Grade 5 fasteners for bolted connections where medium-high strength is required.

This cap screw suits a wide range of residential and light commercial installations where inch-series UNC fasteners are specified. Typical applications include equipment mounting, flanged pipe connections, structural steel assembly, and machinery maintenance. The partial thread engagement allows for greater grip length in through-bolt configurations, making it practical for thick-stack assemblies where full-thread engagement is not required.

Key Features

• Grade 5 steel construction meets SAE J429 mechanical property requirements for medium-high tensile strength
• Zinc-plated finish provides corrosion resistance in indoor and mildly corrosive environments
• Partially threaded shank allows full grip length in thick-material bolted joints
• 1-8 UNC thread standard ensures broad compatibility with standard inch-series nuts and tapped holes
• Conforms to ASME B18.2.1 dimensional standards for hex head cap screws

Compatibility

Designed for use with standard 1-8 UNC hex nuts and tapped holes in inch-series fastener applications across HVAC, plumbing, electrical, and general mechanical assemblies.

Installation Notes

Installation should be performed by qualified tradespeople using an appropriately sized hex wrench or socket. Always verify thread engagement and ensure mating nut or tapped hole is the same UNC thread class before assembly. Derate torque values when installing into tapped holes in aluminum or softer base materials. Inspect zinc coating for damage before installation in wet or corrosive environments.