Value Collection 581786BR Hex Socket Cap Screw 7/8-14 Unf

Product Description

The VALUE COLLECTION 581786BR is a hex socket cap screw engineered for high-strength fastening applications where a low-profile, recessed-drive head is required. Manufactured from alloy steel with a black oxide finish, this screw offers improved corrosion resistance and reduced galling during installation. It features a 7/8-14 UNF (Unified National Fine) thread, a 3-1/4 inch length under head, and a 3/4 inch hex drive. The partial threading design concentrates clamping force and allows for precise load distribution in structural and mechanical assemblies. Licensed tradespeople and maintenance professionals working in industrial and mechanical service environments are the primary installers.

This hex socket cap screw is suited for precision mechanical assemblies, hydraulic fittings, tooling fixtures, and general industrial fastening where fine-thread engagement and reliable torque retention are critical. The fine thread pitch of 14 threads per inch provides superior holding strength in thinner material sections compared to coarse-thread alternatives. It is appropriate for both new fabrication and field repair work across manufacturing, heavy equipment, and mechanical maintenance contexts.

Key Features

• 7/8-14 UNF fine-thread specification for high-load engagement in precision assemblies
• 3-1/4 inch length under head accommodates deeper grip lengths in bolted joints
• 3/4 inch internal hex drive accepts standard hex keys and socket drivers
• Partially threaded shank concentrates clamping load and resists lateral shear
• Alloy steel construction delivers tensile strength suitable for structural fastening
• Black oxide coating provides mild corrosion resistance and reduces light reflection in service environments

Compatibility

Designed as a standard ASME/ANSI B18.3 and ASTM A574 hex socket cap screw suitable for use in any application requiring a 7/8-14 UNF partially threaded fastener with a 3/4 inch hex drive.

Installation Notes

Installation should be performed by qualified mechanical or maintenance tradespeople using a calibrated torque wrench and a properly sized 3/4 inch hex drive tool. Clean and inspect threaded bores before installation to prevent cross-threading or contamination. Apply a thread lubricant or anti-seize compound where specified by the equipment manufacturer to achieve accurate torque values. Do not substitute thread pitch or drive size without verifying compatibility with the mating component.