Value Collection HCI81750450-001BX Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION HCI81750450-001BX is a Grade 8 steel hex head cap screw with a 1-3/4-5 UNC thread and a 4.5-inch length under head. It is partially threaded and carries an uncoated, bright finish. This heavy-duty fastener is used in structural, mechanical, and industrial assemblies where a high-strength bolted joint is required. Installation is performed by mechanical contractors, millwrights, ironworkers, and maintenance technicians working with metal fabrications, machinery mounts, and structural steel connections.

This cap screw suits heavy-load applications across industrial, commercial, and construction settings. The large 1-3/4-inch diameter and Grade 8 rating make it appropriate for high-stress bolted connections in equipment frames, structural steel, and heavy machinery. The partial threading provides a smooth shank section, which is standard practice for joints requiring shear load transfer or close-tolerance bolt holes.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 1-3/4-5 UNC (Unified National Coarse) thread standard for broad nut and hardware compatibility
• Partially threaded shank allows use in shear-load and close-tolerance applications
• Bright, uncoated finish suited for indoor and controlled-environment installations or where coatings are not specified
• 4.5-inch length under head accommodates thick material stacks
• Sold individually, allowing single-piece procurement for repair or replacement work

Compatibility

Designed as a standard UNC hex head cap screw for use with 1-3/4-5 UNC nuts, flat washers, and lock washers in inch-measurement fastener assemblies.

Installation Notes

This fastener is typically installed by mechanical trades or ironworkers using a heavy-duty hex wrench, impact wrench, or torque wrench sized for a 1-3/4-inch hex head. Follow applicable ASME, AISC, or equipment manufacturer torque specifications for Grade 8 fasteners at this diameter — do not estimate torque by feel on structural joints. Always inspect the mating nut and bearing surface for damage before installation. Verify thread engagement depth meets design requirements before applying final torque.