Value Collection 581869BR Hex Socket Cap Screw 1-1/8-7 Unc

Product Description

The VALUE COLLECTION 581869BR is a hex socket cap screw designed for high-strength fastening in industrial, mechanical, and structural applications. It features a 1-1/8-7 UNC thread size with a 4-inch length under the head and a 7/8-inch hex drive socket. Manufactured from alloy steel with a black oxide coating, this fastener delivers corrosion resistance and a consistent surface finish. It is partially threaded, which supports shear-load applications and precise clamping. Machinists, millwrights, and maintenance technicians install this type of fastener where high tensile strength and a recessed drive profile are required.

This cap screw is suited for heavy-duty bolted assemblies in manufacturing equipment, machine frames, tooling fixtures, and structural steel connections. The 1-1/8-7 UNC coarse thread pitch provides strong thread engagement in steel and cast iron base materials. The black oxide finish reduces surface friction during installation and offers mild protection against moisture in indoor or sheltered environments. This screw meets ASME/ANSI B18.3 and ASTM A574 standards, confirming it is rated for high-strength socket cap screw service.

Key Features

• 1-1/8-7 UNC coarse thread for strong engagement in steel and cast iron
• 4-inch length under head suits deep-reach and thick-flange bolted joints
• 7/8-inch hex socket drive requires a standard hex key or socket driver
• Alloy steel construction provides high tensile and yield strength
• Black oxide coating reduces friction and offers mild corrosion resistance
• Meets ASME/ANSI B18.3 and ASTM A574 standards for high-strength socket cap screws
• Partially threaded shank supports shear loading and precise clamp-length control

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw suitable for tapped holes with 1-1/8-7 UNC internal threads in steel, cast iron, or compatible base materials.

Installation Notes

Installation requires a correctly sized 7/8-inch hex key or socket driver; use of an undersized tool risks rounding the socket drive. Verify the tapped hole thread class and depth before installation to ensure full thread engagement. Apply a calibrated torque wrench to achieve the specified clamp load for the joint design. Always de-energize and lock out any machinery before servicing fasteners on moving or pressurized assemblies.