Value Collection 581826BR Hex Socket Cap Screw 1-8 Unc

Product Description

The VALUE COLLECTION 581826BR is a hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 1-8 UNC thread size and an 18-inch length under the head, making it well-suited for through-bolting heavy components or securing thick structural members. The fastener is manufactured from alloy steel and finished with a black oxide coating that provides moderate corrosion resistance and reduces light reflection. Drive engagement is via a 3/4-inch hex socket. Installation requires a torque wrench or hex key set with the appropriate 3/4-inch socket drive. This part is sold individually.

This cap screw is used in fabrication shops, maintenance and repair operations, and industrial equipment assembly where a partially threaded, high-strength socket head fastener is specified. The 1-8 UNC thread form is a coarse-thread standard common in steel assemblies where thread stripping resistance and ease of assembly are priorities. The black oxide finish suits indoor or low-exposure environments. Machinists, millwrights, and maintenance technicians are the primary installers of this fastener type.

Key Features

• 1-8 UNC coarse thread for strong engagement in steel and alloy substrates
• 18-inch length under head accommodates thick material stacks or long through-bolt applications
• Alloy steel construction provides high tensile and shear strength
• Black oxide finish offers mild corrosion resistance and a non-reflective surface
• 3/4-inch hex socket drive for use with standard socket tooling
• Partially threaded shank for precise clamping and shear load transfer
• Meets ASME/ANSI B18.3 and ASTM A574 fastener standards

Compatibility

Designed as a standard 1-8 UNC hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574, suitable for use in any application specifying a partially threaded alloy steel socket head cap screw in that thread size and length.

Installation Notes

Installation should be performed by a qualified machinist, millwright, or maintenance technician familiar with high-strength fastener procedures. Ensure mating threaded holes or nuts are clean, free of debris, and correctly tapped to 1-8 UNC specification before installation. Use the correct 3/4-inch hex socket drive to avoid cam-out or fastener damage. Refer to applicable engineering specifications or torque tables for the correct clamp load based on grade and joint requirements.