Value Collection 403346BR Hex Head Cap Screw 1-8x4 Grade 2

Product Description

The VALUE COLLECTION 403346BR is a partially threaded hex head cap screw designed for general-purpose fastening applications in mechanical, structural, and trade assembly work. Built from Grade 2 steel with a zinc-plated finish, this fastener measures 1-8 inch thread size with a 4-inch length under the head, following the Unified National Coarse (UNC) thread standard. The zinc plating provides a baseline level of corrosion resistance suited to indoor and light-duty outdoor environments. Installation requires a 1-1/2 inch hex key or wrench. This screw is commonly installed by mechanical contractors, pipefitters, HVAC technicians, and general tradespeople during equipment assembly, panel mounting, and structural fastening tasks.

This fastener fits a wide range of general industrial and trade applications where a large-diameter, coarse-thread cap screw with partial threading is required. Partial threading allows the unthreaded shank to bear shear loads and provide accurate clamping between mating surfaces. It is well-suited for bolting steel components, mounting brackets, equipment frames, and similar assemblies where a UNC thread engagement is specified. The inch measurement system makes it a direct fit for standard North American hardware specifications.

Key Features

• Grade 2 steel construction for reliable general-purpose strength
• Zinc-plated finish provides basic corrosion resistance for indoor and light-duty use
• Partially threaded shank allows shear load bearing and precise clamping action
• UNC thread standard for compatibility with standard North American inch-system nuts and tapped holes
• 1-1/2 inch hex drive fits standard open-end, box-end, and socket wrenches
• Large 1-8 thread diameter suited for high-clamping-force structural and equipment applications

Compatibility

Designed as an OEM-style replacement or standard fastener for general mechanical and structural assemblies requiring a 1-8 UNC partially threaded hex head cap screw in Grade 2 steel.

Installation Notes

Installation should be performed by a qualified tradesperson following applicable mechanical codes and equipment manufacturer torque specifications. Always verify thread engagement and confirm the mating nut or tapped hole is the correct UNC standard before final assembly. Apply a thread lubricant or anti-seize compound where required by the application to prevent galling on large-diameter fasteners. De-energize and lock out any equipment before fastening components to live machinery or electrical enclosures.