Value Collection 581812BR Hex Socket Cap Screw 1-8 Unc

Product Description

The VALUE COLLECTION 581812BR is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, structural connections, and industrial equipment. It features a 1-8 UNC thread size and a 3/4 inch hex drive, requiring a hex key or Allen wrench for installation and removal. The screw is partially threaded with a 3-3/4 inch length under head, providing a smooth shank section that resists shear loads in close-tolerance bores. Manufactured from alloy steel with a black oxide finish, it offers improved corrosion resistance over bare steel and reduces light reflection in service environments. Machinists, maintenance technicians, and mechanical contractors are the typical installers.

This cap screw is suited for use in general industrial machinery, fixtures, tooling, and structural steel fabrication where a recessed-drive, high-strength fastener is required. The 1-8 UNC coarse thread makes it well suited for threading into steel, cast iron, and aluminum without requiring fine-pitch tapped holes. Partial threading is particularly useful in through-bolt and clearance-hole assemblies where the shank must pass through an unthreaded bore before engaging a nut or tapped hole.

Key Features

• 1-8 UNC coarse thread for broad material compatibility in tapped steel and cast iron applications
• 3/4 inch hex socket drive for high-torque installation with standard hex keys or socket drivers
• Partially threaded shank resists shear forces in close-tolerance or clearance-bore assemblies
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards
• Black oxide finish provides mild corrosion protection and low-reflectance appearance

Compatibility

Designed as an OEM-style replacement or standard-service hex socket cap screw for industrial machinery, fixtures, and mechanical assemblies requiring a 1-8 UNC partially threaded fastener with a 3/4 inch hex drive.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with fastener torque requirements for alloy steel socket cap screws. Ensure the mating tapped hole or nut meets the same UNC thread specification before assembly. Apply thread lubricant or anti-seize as required by the application and clean all mating surfaces before installation. Do not exceed the rated torque range for the screw diameter and material grade.