Holo-krome 73090 Hex Socket Cap Screw 5/16-24 Unf Alloy Steel

Product Description

The HOLO-KROME 73090 is a hex socket cap screw designed for high-strength fastening applications in mechanical, industrial, and trade service environments. It features a 5/16-24 UNF thread size and measures 1.75 inches in length under the head. The screw is partially threaded and driven with a 1/4 inch hex key. Constructed from alloy steel with a black oxide coating, this fastener resists corrosion while maintaining the tensile strength required for demanding assemblies. It conforms to ASME B18.3 and ASTM A574 standards, making it a reliable choice for precision fastening in tight-clearance installations.

The 73090 is suited for mechanical assemblies, equipment maintenance, and structural fastening tasks where a flush or low-profile head is required. The fine UNF thread pitch provides greater thread engagement per inch compared to coarse-thread fasteners, which is useful in thin-material applications or where vibration resistance is a priority. Licensed tradespeople and industrial maintenance technicians working on pumps, motors, enclosures, and machinery components will find this screw appropriate for a wide range of service scenarios.

Key Features

• 5/16-24 UNF fine thread for increased thread engagement and vibration resistance
• 1.75 inch length under head accommodates medium-depth fastening applications
• Partially threaded shank provides shear strength in close-tolerance assemblies
• 1/4 inch hex drive allows use with standard hex keys and Allen wrenches
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as an OEM-style replacement or standard hex socket cap screw for mechanical assemblies requiring a 5/16-24 UNF partially threaded fastener with a 1/4 inch hex drive.

Installation Notes

Installation is typically performed by licensed mechanics, millwrights, or qualified maintenance technicians. Always power down and de-energize any equipment before accessing fastener locations on electrical or mechanical assemblies. Use a properly sized 1/4 inch hex key or driver to avoid rounding the socket drive. Follow applicable torque specifications from the equipment manufacturer for the specific assembly being serviced.