Value Collection 581948BR Hex Socket Cap Screw 1-3/8-6 Unc

Product Description

The VALUE COLLECTION 581948BR is a hex socket cap screw designed for heavy-duty fastening applications requiring precise torque and reliable clamping force. This screw measures 6 inches in length under the head with a 1-3/8-6 UNC thread size and a 1-inch hex drive. It is partially threaded, which allows for better clamping between mating surfaces. Constructed from alloy steel and finished with a black oxide coating, this fastener resists corrosion in moderate environments while maintaining the high tensile strength typical of ASTM A574-grade socket cap screws. It conforms to ASME/ANSI B18.3 dimensional standards.

This fastener is used in mechanical, structural, and industrial assembly applications where a socket-drive cap screw is required. The 1-3/8-6 UNC coarse thread is suited for general-purpose steel fabrication, machinery mounting, and heavy equipment assembly. The large 1-3/8-inch diameter makes it appropriate for high-load joints in commercial and industrial settings. Typical installers include millwrights, industrial mechanics, and maintenance technicians working on equipment frames, structural brackets, and fabricated steel assemblies.

Key Features

• 1-3/8-6 UNC coarse thread for high-load fastening in steel applications
• 6-inch length under head accommodates thick material stacking
• Partially threaded shank improves clamping performance at joint interfaces
• 1-inch hex drive socket interface for use with standard hex keys or drive tools
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in tapped holes or with nuts accepting 1-3/8-6 UNC threads in industrial and mechanical assemblies.

Installation Notes

Installation should be performed by qualified mechanics or millwrights using a properly sized 1-inch hex key or socket drive tool. Confirm that the mating tapped hole or nut matches the 1-3/8-6 UNC thread specification before installation. Apply thread lubricant or anti-seize compound as required by the application to achieve accurate torque values. De-energize and lockout any associated equipment before fastener service to comply with applicable safety procedures.