Value Collection 581567PR Hex Socket Cap Screw 1/2-13 Unc

Product Description

The VALUE COLLECTION 581567PR is a partially threaded hex socket cap screw designed for high-strength bolted connections in mechanical, structural, and industrial assembly applications. It features a 1/2-13 UNC thread size and measures 12 inches in length under the head, making it suitable for deep-reach fastening where standard-length fasteners fall short. The screw is machined from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and reduces light glare on tooled surfaces. A 3/8-inch hex drive socket is required for installation. Machinists, millwrights, and mechanical contractors are the primary installers of this fastener.

This cap screw is used in general industrial machinery assembly, jig and fixture builds, heavy equipment maintenance, and structural steel fabrication where a recessed-drive, high-tensile fastener is specified. The 1/2-13 UNC coarse thread pattern seats quickly and holds reliably in steel and cast-iron tapped holes. The 12-inch under-head length suits thick stack-ups, long-reach clamping, and through-bolt configurations that require extended grip length. It meets ASME/ANSI B18.3 and ASTM A574 standards, confirming dimensional and mechanical property compliance for critical fastener applications.

Key Features

• 1/2-13 UNC coarse thread for fast engagement in steel and cast-iron tapped holes
• 12-inch length under head accommodates thick stack-ups and long-reach installations
• Partial threading leaves a smooth shank section for shear-load and alignment applications
• Alloy steel construction provides high tensile and shear strength
• Black oxide finish offers mild corrosion resistance and low-reflectance surface
• Meets ASME/ANSI B18.3 and ASTM A574 standards for dimensional and mechanical compliance

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any tapped hole or nut accepting a 1/2-13 UNC thread. Compatible with standard 3/8-inch hex drive socket tools and bits.

Installation Notes

Installation is performed by machinists, millwrights, or mechanical contractors using a 3/8-inch hex drive socket or Allen-style key. Ensure the mating tapped hole is clean, free of debris, and cut to 1/2-13 UNC specification before driving the fastener. Apply thread lubricant or anti-seize compound as required by the assembly specification, particularly when threading into dissimilar metals. De-energize and lock out all equipment before replacing or installing fasteners on operating machinery in accordance with applicable OSHA lockout/tagout procedures.