Value Collection 581947BR Hex Socket Cap Screw 1-3/8-6 Unc

Product Description

The VALUE COLLECTION 581947BR is a partially threaded hex socket cap screw designed for high-strength fastening applications in industrial and mechanical assemblies. It carries a 1-3/8-6 UNC thread size with a 5-1/2 inch length under the head and is driven by a 1-inch internal hex socket. Constructed from alloy steel with a black oxide finish, it delivers solid corrosion resistance and a low-reflectance appearance suited for tooling, fixtures, jigs, and machinery. It meets ASME/ANSI B18.3 and ASTM A574 standards, confirming dimensional accuracy and mechanical property requirements for socket head cap screws.

This screw is used in applications requiring a flush or recessed fastener profile with high clamp load. Typical installations include machine bases, hydraulic components, die sets, and structural steel fabrication where hex key access is preferred over external wrench clearance. The black oxide finish is appropriate for indoor and lightly protected environments. Machinists, millwrights, maintenance mechanics, and fabricators commonly specify this type of fastener in OEM and MRO contexts.

Key Features

• 1-3/8-6 UNC thread form for coarse-thread engagement in standard tapped holes
• 5-1/2 inch length under head accommodates thick material stacks and deep through-bolt applications
• Partially threaded shank provides a shoulder bearing surface for precision alignment
• 1-inch internal hex drive reduces cam-out risk and allows high-torque installation with standard hex keys or Allen sockets
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide coating provides mild corrosion resistance and reduces light reflection in tooling environments

Compatibility

Designed as a standard ASME/ANSI B18.3 socket head cap screw for use in any tapped hole conforming to 1-3/8-6 UNC thread specifications.

Installation Notes

Installation is typically performed by machinists or maintenance mechanics using a 1-inch hex key or Allen socket drive. Ensure the mating tapped hole is clean, free of debris, and cut to the correct UNC thread class before installation. Apply appropriate thread lubricant or anti-seize compound per the assembly specification. Follow applicable torque guidelines for ASTM A574 alloy steel socket head cap screws from a current engineering reference.