Value Collection 451118PR Hex Head Cap Screw 1/2-20 Grade 8

Product Description

The VALUE COLLECTION 451118PR is a Grade 8 steel hex head cap screw with a 1/2-20 UNF thread and a 9.5-inch length under head. Partially threaded and left in a bright, uncoated finish, this fastener is built to ASME B18.2.1 dimensional standards. Grade 8 steel delivers high tensile strength suitable for demanding structural and mechanical assembly applications. The 7/16-inch hex key drive size allows installation with standard box-end wrenches or impact tools. Maintenance technicians, millwrights, and general contractors use this type of fastener wherever a high-strength inch-series bolt is required.

This cap screw suits a wide range of industrial, mechanical, and structural assembly applications where fine-thread engagement and high clamping force are priorities. The 1/2-20 UNF thread pitch provides finer thread engagement than its coarse-thread counterpart, making it a common choice in applications subject to vibration or where precise torque control matters. The partial threading leaves a smooth shank section near the head, which is appropriate for through-bolted assemblies requiring shank bearing load transfer.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 1/2-20 UNF fine-thread series for increased thread engagement and vibration resistance
• Partially threaded shank supports shear and bearing load in through-bolted joints
• Bright uncoated finish — suitable for indoor or dry environments; apply coating as needed for corrosive service
• Conforms to ASME B18.2.1 dimensional standards
• 7/16-inch hex drive compatible with standard wrench and socket tooling

Compatibility

Designed as a standard 1/2-20 UNF Grade 8 hex head cap screw per ASME B18.2.1, suitable for use in any inch-series mechanical or structural assembly requiring a fine-thread half-inch fastener with high-strength steel properties.

Installation Notes

Install and torque using a 7/16-inch hex wrench, box-end wrench, or socket driver rated for Grade 8 fasteners. Always consult applicable engineering specifications or torque charts for the specific joint material and clamping requirements before final assembly. Uncoated fasteners are not recommended for outdoor or corrosive environments without additional corrosion protection. Ensure mating threads are clean and free of debris before assembly to avoid false torque readings.