Holo-krome 72124 Hex Socket Cap Screw 5/16-18 Unc 3/4 in

Product Description

The HOLO-KROME 72124 is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, industrial equipment, and structural fixtures. Threaded 5/16-18 UNC and fully threaded along its 3/4-inch length under head, this fastener provides consistent clamping force across the full grip range. It is driven with a 1/4-inch hex key and manufactured from alloy steel with a black oxide finish that provides mild corrosion resistance and reduces light reflection in finished assemblies. Machinists, millwrights, and MRO technicians are the typical installers for this fastener type.

This screw is suited for use in close-tolerance mechanical joints, machine frames, jigs, fixtures, and equipment panels where a low-profile socket head is required. The 5/16-18 UNC thread is a coarse-series inch thread compatible with standard tapped holes and threaded inserts to that specification. The alloy steel construction supports high tensile and shear loads compared to standard carbon steel fasteners of the same size.

Key Features

• 5/16-18 UNC coarse thread - fits standard tapped holes and threaded inserts to that size
• Fully threaded 3/4-inch length under head for maximum thread engagement in thin material applications
• 1/4-inch hex socket drive for use with standard hex keys and socket-drive tools
• Alloy steel construction meets ASME B18.3 and ASTM A574 standards for high-strength socket cap screws
• Black oxide finish provides mild corrosion resistance and a matte appearance

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for any application requiring a 5/16-18 UNC fully threaded hex socket cap screw conforming to ASME B18.3 and ASTM A574 specifications.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a 1/4-inch hex key or Allen-drive socket. De-energize and lock out any equipment before installing or removing fasteners in live assemblies. Do not exceed the rated tensile strength for the thread size and material grade. Follow applicable torque guidelines from ASME or the equipment OEM for 5/16-18 alloy steel fasteners.