Value Collection 581931BR Hex Socket Cap Screw 1-1/4-12 Unf

Product Description

The VALUE COLLECTION 581931BR is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling, and structural connections. It features a 1-1/4-12 UNF thread size, a 9-inch length under the head, and partial threading along the shank. Manufactured from alloy steel with a black oxide finish, it delivers corrosion resistance and a consistent surface hardness suited to demanding service environments. The 7/8-inch hex drive socket interface accepts standard hex keys and driver tooling. This fastener meets ASME/ANSI B18.3 and ASTM A574 dimensional and mechanical standards, making it appropriate for safety-critical and load-bearing fastener positions.

This screw is used in industrial machinery, heavy equipment frames, hydraulic component mounting, and precision fixture work where fine-thread engagement and high clamping force are required. The 1-1/4-12 UNF fine thread pitch provides greater thread engagement per inch compared to coarse-thread equivalents, which is useful in applications involving vibration or where precise torque control matters. It is typically installed by machinists, millwrights, pipefitters, and maintenance mechanics working on steel fabrications or machine bases. The partial threading leaves a smooth shank section that aids in alignment and shear load distribution.

Key Features

• 1-1/4-12 UNF fine thread for precise clamping and high load capacity
• 9-inch length under head accommodates thick material stacks
• Partially threaded shank supports shear load distribution and alignment
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide coating provides baseline corrosion resistance and reduced surface reflectivity
• 7/8-inch hex socket drive compatible with standard hex keys and drive tooling
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard-dimension hex socket cap screw per ASME/ANSI B18.3 and ASTM A574, suitable for tapped holes or flanged applications requiring a 1-1/4-12 UNF partially threaded fastener with a 9-inch length under head.

Installation Notes

Installation is performed by qualified mechanics or millwrights using a calibrated torque wrench with the appropriate 7/8-inch hex bit or key. Verify that the mating tapped hole thread class and depth are compatible with a 1-1/4-12 UNF fastener before installation. De-energize, lock out, and tag out any equipment before servicing fastened assemblies per applicable OSHA lockout/tagout procedures. Do not reuse fasteners that show signs of thread deformation, galling, or corrosion damage.