Value Collection 581784BR Hex Socket Cap Screw 7/8-14 Unf

Product Description

The VALUE COLLECTION 581784BR is a hex socket cap screw designed for high-strength fastening applications. It features a 7/8-14 UNF thread form, a 3-inch length under head, and full threading along the entire shank. The screw is machined from alloy steel and finished with a black oxide coating that provides moderate corrosion resistance and reduces surface reflectivity. It is driven with a 3/4-inch hex key. This fastener meets ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for demanding mechanical assemblies where tensile strength and dimensional consistency are required.

This screw is used in mechanical, industrial, and equipment assembly applications where a recessed hex drive and high-strength alloy construction are needed. Typical installations include machine frames, jigs, fixtures, tooling plates, and structural assemblies. The 7/8-14 UNF fine thread pitch provides greater thread engagement and improved torque control compared to coarse thread equivalents, making it well suited for applications where vibration resistance or precise clamping loads matter.

Key Features

• 7/8-14 UNF fine thread for increased thread engagement and vibration resistance
• 3-inch length under head, fully threaded along the entire shank
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish for moderate corrosion resistance and low-glare appearance
• 3/4-inch hex socket drive for high-torque installation with standard hex keys or socket drivers
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any application requiring a 7/8-14 UNF fully threaded fastener with a 3/4-inch hex drive.

Installation Notes

Install using a calibrated torque wrench or hex key rated for the 3/4-inch drive size. Ensure the mating threaded hole is clean and free of debris before assembly. Alloy steel fasteners can be susceptible to hydrogen embrittlement if improperly handled after plating — do not substitute with lower-grade hardware in high-stress joints. Follow applicable mechanical assembly standards and equipment manufacturer torque specifications for the joint being fastened.