Value Collection 581940BR Hex Socket Cap Screw 1-3/8-6 Unc

Product Description

The VALUE COLLECTION 581940BR is a fully threaded hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 1-3/8-6 UNC thread size and a 3-inch length under head, providing deep thread engagement suited to heavy-duty clamping loads. The drive is a 1-inch internal hex socket, compatible with standard hex keys and socket drive tools. Constructed from alloy steel with a black oxide finish, this screw delivers solid corrosion resistance and a hardened surface appropriate for demanding service environments. Machinists, millwrights, and maintenance technicians install this fastener type in equipment frames, machine bases, and heavy assemblies.

This screw is suited for use in general industrial machinery, fabrication fixtures, structural steel assemblies, and heavy mechanical equipment. The coarse 6-TPI UNC thread pattern allows fast installation and performs well in applications where vibration resistance and high clamp load are priorities. The black oxide coating reduces surface friction during installation and provides moderate rust inhibition in low-moisture environments. It meets ASME/ANSI B18.3 and ASTM A574 standards, making it appropriate for documented mechanical assemblies where fastener grade traceability is required.

Key Features

• 1-3/8-6 UNC coarse thread for high clamp load and vibration resistance
• 3-inch length under head for deep engagement in thick material
• 1-inch internal hex socket drive for use with standard hex keys and drive tools
• Alloy steel construction rated to ASTM A574 for high tensile strength
• Black oxide finish reduces friction and provides light corrosion protection
• Meets ASME/ANSI B18.3 dimensional standards for interchangeability

Compatibility

Designed as an OEM-style and aftermarket replacement hex socket cap screw for industrial machinery, fabrication equipment, and structural assemblies requiring a 1-3/8-6 UNC fully threaded fastener conforming to ASME/ANSI B18.3 and ASTM A574.

Installation Notes

Installation is performed by machinists, millwrights, or qualified maintenance technicians. Ensure the mating threaded hole is clean, free of debris, and correctly tapped to 1-3/8-6 UNC before installation. De-energize and lock out all equipment per applicable OSHA lockout/tagout procedures before fastener service. Use a calibrated torque wrench with the appropriate 1-inch hex bit to achieve the required clamp load per the equipment manufacturer's documentation.