Value Collection HCI51000325G Hex Cap Screw 1-8 X 3-1/4 Grade 5

Product Description

The VALUE COLLECTION HCI51000325G is a partially threaded hex head cap screw designed for heavy-duty fastening applications in structural, mechanical, and industrial assemblies. Manufactured from Grade 5 steel with a hot-dipped galvanized finish, this fastener provides reliable corrosion resistance suitable for outdoor and high-moisture environments. The screw measures 3-1/4 inches in length under the head with a 1-8 UNC thread size, making it compatible with standard inch-series tapped holes and nuts. It is the type of general-purpose fastener installed daily by millwrights, ironworkers, plumbers, HVAC technicians, and mechanical contractors across a wide range of trade applications.

This hex head cap screw is suited for residential, commercial, and light industrial fastening work where a corrosion-resistant, partially threaded bolt is required. The 1-8 UNC thread series is a coarse-thread standard widely used in North American construction and mechanical assembly. Partial threading allows the unthreaded shank to bear shear loads in bolted joints, a common requirement in structural connections and equipment mounting scenarios.

Key Features

• Grade 5 steel construction for improved tensile strength over Grade 2 fasteners
• Hot-dipped galvanized finish for corrosion resistance in outdoor and wet environments
• Partially threaded shank allows shear load transfer at bolted joint interfaces
• 1-8 UNC thread standard ensures compatibility with standard inch-series hardware
• Hex head drive style accepts standard hex wrenches and impact sockets

Compatibility

Designed as a standard inch-series hex head cap screw compatible with 1-8 UNC tapped holes, standard hex nuts, and flat washers conforming to inch fastener specifications.

Installation Notes

Installation should be performed by a qualified tradesperson using a properly sized hex wrench, box wrench, or impact driver with the correct socket. Always ensure mating threads are clean and free of debris before driving. Follow applicable torque guidelines from the fastener manufacturer or relevant structural specifications for Grade 5 hardware. Do not use this fastener in applications requiring stainless steel or other specific alloy grades where galvanized steel is not approved.