Value Collection 721244PR Flat Socket Cap Screw 1/2-13 X 4 in

Product Description

The VALUE COLLECTION 721244PR is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. With a 1/2-13 UNC thread size and an overall length of 4 inches, this screw is partially threaded and driven with a 5/16-inch hex socket. It is manufactured from alloy steel with a black oxide finish that provides moderate corrosion resistance and reduces light reflection on exposed surfaces. This fastener suits structural assemblies, machine components, and fabrication work where a low-profile head is required. Installation is handled by machinists, millwrights, pipefitters, and general mechanical contractors.

This flat socket cap screw fits into countersunk holes machined to match its flat head geometry. The 1/2-13 UNC coarse thread engages standard tapped holes in steel, iron, and other ferrous materials. Partial threading allows the shank to act as a dowel-like locating feature in through-hole or close-tolerance applications. It meets ASME/ANSI B18.3 and ASTM F835 fastener standards, making it appropriate for general industrial machinery, structural steel assemblies, and mechanical equipment where dimensional conformance is specified.

Key Features

• Flat head profile seats flush in countersunk holes, eliminating protrusion above the mating surface
• 5/16-inch hex socket drive for use with standard hex keys or Allen-style bit drivers
• 1/2-13 UNC coarse thread for reliable engagement in standard tapped steel and iron
• Partially threaded shank provides a smooth bearing surface for precision location
• Alloy steel construction delivers high tensile and shear strength for structural fastening
• Black oxide finish offers mild corrosion resistance and low-reflectance surface appearance
• Conforms to ASME/ANSI B18.3 and ASTM F835 dimensional and performance standards

Compatibility

Designed as a standard replacement or stock fastener for industrial machinery, structural assemblies, and mechanical equipment requiring a 1/2-13 UNC flat socket cap screw with a 4-inch overall length per ASME/ANSI B18.3 and ASTM F835 specifications.

Installation Notes

Installation is performed by qualified mechanics, machinists, or millwrights using a properly sized 5/16-inch hex key or Allen-head driver. Ensure the mating countersunk hole is machined to the correct flat-head angle before fastening. De-energize and lock out equipment before replacing fasteners in live assemblies per applicable OSHA lockout/tagout procedures. Do not exceed rated torque values specified by the equipment manufacturer or the applicable ASME fastener standard for the thread size and material grade.