Value Collection 451105PR Hex Cap Screw 1/2-13 X 8-1/2 in Grade 8

Product Description

The VALUE COLLECTION 451105PR is a 1/2-13 x 8-1/2 inch hex head cap screw manufactured from Grade 8 steel with a bright, uncoated finish. It features partial threading along the shank and conforms to ASME B18.2.1 dimensional standards. The UNC thread form and high-strength Grade 8 material rating make this fastener suitable for heavy-duty bolted assemblies where tensile strength and dimensional consistency are critical. Machinists, millwrights, and maintenance professionals routinely use this fastener class in structural and mechanical applications requiring a reliable, high-load connection.

This cap screw is suited for general industrial and mechanical assembly applications where a partially threaded, large-diameter fastener is required. The 8-1/2 inch length under head accommodates thick stack-ups or long through-bolt configurations in steel fabrication, machinery mounting, and structural connections. The bright uncoated finish is appropriate for indoor or protected environments where corrosion resistance from a coating is not required.

Key Features

• Grade 8 steel construction for high tensile and proof-load strength
• 1/2-13 UNC thread form with partial threading along the shank
• 8-1/2 inch length under head for long through-bolt applications
• Bright uncoated finish — no coating buildup on thread tolerances
• Conforms to ASME B18.2.1 dimensional standard
• 3/4 inch hex key size for use with standard open-end or socket wrenches

Compatibility

Designed as an OEM-style replacement or standard-stock fastener for mechanical and structural assemblies requiring a 1/2-13 UNC partially threaded hex head cap screw meeting ASME B18.2.1 specifications.

Installation Notes

Installation should be performed by a qualified mechanic or millwright using a 3/4 inch open-end, box, or socket wrench. De-energize and lock out all equipment before fastener replacement in mechanical assemblies. Apply fastener torque values specified by the equipment manufacturer or applicable engineering standard — do not rely on generic torque tables without confirming joint requirements. Grade 8 fasteners should be paired with Grade 8 or equivalent nuts and hardened washers to maintain rated joint integrity.