Value Collection 581794BR Hex Socket Cap Screw 7/8-14 Unf

Product Description

The VALUE COLLECTION 581794BR is a hex socket cap screw designed for high-strength fastening in demanding mechanical and structural applications. Machined from alloy steel with a black oxide finish, this fastener features a 7/8-14 UNF thread size and a 5-inch length under head with partial threading. The 3/4-inch hex drive accepts standard hex keys and socket drivers. The black oxide coating provides mild corrosion resistance and reduces surface reflectivity. This screw is manufactured to ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for applications requiring verified tensile and proof-load performance. Typically installed by machinists, millwrights, and mechanical contractors.

This fastener is suited for use in heavy equipment assembly, fixture building, machine frames, and general industrial fastening where a fine-thread UNF pattern is specified. The 7/8-14 UNF thread pitch provides tighter thread engagement compared to coarse-thread equivalents, offering better resistance to vibration loosening. Partial threading allows the unthreaded shank to act as a pilot or load-bearing shoulder in appropriate joint designs.

Key Features

• 7/8-14 UNF fine-thread for improved vibration resistance and precise fit
• 5-inch length under head with partial threading for shoulder-fit joint designs
• 3/4-inch hex socket drive for use with standard hex keys or socket drivers
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish for mild corrosion resistance and low surface reflectivity
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw suitable for any application specifying a 7/8-14 UNF partially threaded socket cap screw in alloy steel.

Installation Notes

Install using a calibrated torque wrench with a 3/4-inch hex bit to achieve proper clamp load without yielding the fastener. Always degrease mating threads or apply the specified thread lubricant before torquing to ensure accurate torque-to-tension results. De-energize and lock out all equipment before replacing fasteners on live machinery in accordance with applicable OSHA lockout/tagout procedures. Inspect threads and seating surfaces for damage before installation.