Value Collection 451018BR Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION 451018BR is a Grade 8 steel hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. This screw features a 1-1/8-12 UNF thread size and measures 4-1/2 inches under the head, with a partially threaded shank for positive bearing engagement in thicker joint materials. The bright, uncoated finish reflects the raw steel surface without any plating or protective coating applied. At 1.61 pounds per unit, this is a substantial fastener suited for demanding load conditions. It conforms to ASME B18.2.1 standards, making it appropriate wherever dimensional compliance is required.

This cap screw is used in heavy equipment assembly, machinery fabrication, structural steel connections, and industrial maintenance applications where Grade 8 tensile strength is specified. The 1-1/8-12 UNF thread pitch is common in precision-fit applications requiring finer thread engagement than the coarse UNC equivalent. Machinists, millwrights, maintenance mechanics, and structural fabricators are the primary installers. It is sold individually, making it suitable for replacement or low-quantity procurement needs.

Key Features

• Grade 8 steel construction for high tensile strength and hardness requirements
• 1-1/8-12 UNF partially threaded shank for controlled thread engagement in thick joint stacks
• 4-1/2 inch length under head to accommodate deep fastening applications
• Bright, uncoated finish — no plating or coating that could affect dimensional tolerances
• Conforms to ASME B18.2.1 for dimensional standardization
• 1-11/16 inch hex key (wrench) size for standard tooling fitment

Compatibility

Designed as a standard ASME B18.2.1 compliant Grade 8 hex head cap screw compatible with any application specifying a 1-1/8-12 UNF thread and a 4-1/2 inch length under head.

Installation Notes

Installation should be performed by a qualified mechanic or millwright familiar with high-strength fastener procedures. Always clean and inspect mating threads before installation and use a calibrated torque wrench to achieve the specified clamp load per the equipment manufacturer or applicable engineering specification. Do not substitute lubricant types without verifying the torque-tension relationship, as lubrication significantly affects achieved clamp load. Replace any fastener that shows signs of thread damage, corrosion, or deformation.