Value Collection 581921BR Hex Socket Cap Screw 1-1/4-12 Unf

Product Description

The VALUE COLLECTION 581921BR is a partially threaded hex socket cap screw designed for high-strength bolted assemblies requiring precise thread engagement and a recessed drive interface. Sized at 1-1/4-12 UNF with a 5-inch length under head and a 7/8-inch hex drive, this fastener is manufactured from alloy steel and finished with a black oxide coating for corrosion resistance. Compliant with ASME/ANSI B18.3 and ASTM A574 standards, it is suited for industrial, mechanical, and structural applications where a flush or near-flush head profile is required. Machinists, millwrights, and maintenance technicians are the typical installers.

This cap screw is used in medium-to-heavy mechanical assemblies, including machine tooling, equipment frames, hydraulic components, and structural fixtures where fine thread pitch provides superior holding power and vibration resistance compared to coarse thread alternatives. The 1-1/4-12 UNF thread form is commonly found in precision industrial equipment requiring controlled clamp load and exact torque specifications. The partial threading design allows for a stronger unthreaded shank section, which is advantageous in shear-loaded joints.

Key Features

• 1-1/4-12 UNF fine thread for high clamp load and vibration resistance
• 5-inch length under head suits deep or thick-joint fastening applications
• 7/8-inch hex socket drive for use with standard hex keys or socket drivers
• Partially threaded shank provides enhanced shear strength at joint interfaces
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish offers mild corrosion resistance and reduced surface glare

Compatibility

Designed as a standard ASME/ANSI B18.3 and ASTM A574 compliant hex socket cap screw for industrial and mechanical assemblies requiring a 1-1/4-12 UNF partially threaded fastener.

Installation Notes

Installation should be performed by a qualified mechanic or millwright using a calibrated torque wrench and the appropriate 7/8-inch hex key or socket. De-energize and lock out all equipment before fastener service to prevent injury. Black oxide finish does not substitute for heavy-duty corrosion protection in wet or outdoor environments; apply a thread lubricant or sealant as required by the application. Follow applicable machine or equipment manufacturer torque specifications when tightening.