Value Collection 581773BR Hex Socket Cap Screw 7/8-9

Product Description

The VALUE COLLECTION 581773BR is a hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. Threaded 7/8-9 UNC with an 18-inch length under head, this screw is partially threaded and features a 3/4-inch hex drive socket. The alloy steel construction is finished with a black oxide coating that provides mild corrosion resistance and reduces surface reflectivity. It conforms to ASME/ANSI B18.3 and ASTM A574 standards, making it a recognized choice for engineered fastener applications. Licensed trades, machinists, and maintenance professionals install this type of fastener in heavy equipment, fixtures, and fabricated steel assemblies.

This screw is suited for use in bolted connections requiring a recessed drive and a strong clamping load. The 7/8-9 UNC thread pitch and partial threading allow it to pass freely through clearance holes before engaging the tapped section, which is common in through-bolt and blind-tapped configurations. The black oxide finish is appropriate for indoor or lightly controlled environments. Applications include press frames, machine bases, structural brackets, and industrial equipment where socket head access is required.

Key Features

• 7/8-9 UNC thread size for high clamping force in standard unified coarse thread applications
• 18-inch length under head accommodates deep or thick workpiece stacking
• Partially threaded shank reduces thread engagement in clearance regions for proper load distribution
• 3/4-inch hex socket drive allows use with standard hex keys and socket drivers
• Alloy steel construction meets ASTM A574 for high-strength socket cap screw requirements
• Black oxide coating provides mild oxidation resistance and low-reflectance surface

Compatibility

Designed as an OEM-style or replacement hex socket cap screw for industrial machinery, fabricated assemblies, and structural fixtures requiring a 7/8-9 UNC partially threaded fastener with an 18-inch length under head.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or maintenance technician using an appropriately rated 3/4-inch hex key or T-handle driver. Ensure the mating tapped hole thread class and depth are compatible with 7/8-9 UNC before installation. De-energize, lock out, and tag out any connected equipment before fastening or removing hardware in live machinery. Do not use impact tools unless the fastener and joint are rated for dynamic loading.