Holo-krome 73058 Hex Socket Cap Screw 1/4-28 Unf Alloy Steel

Product Description

The HOLO-KROME 73058 is a hex socket cap screw designed for high-strength fastening applications requiring precise thread engagement and a clean, finished appearance. This screw features a 1/4-28 UNF thread size with a 5/8-inch length under head and is fully threaded along its entire shank. The 3/16-inch hex drive accepts a standard hex key or Allen-style driver. Manufactured from alloy steel and finished with a black oxide coating, this fastener delivers corrosion resistance and a low-reflectance surface suited for demanding mechanical and industrial assemblies. It meets ASME B18.3 and ASTM A574 standards.

This screw is commonly used in mechanical, hydraulic, and precision equipment assemblies where a flush or recessed fastener head is required. The 1/4-28 UNF fine thread pitch provides superior clamping force and vibration resistance compared to coarse thread equivalents, making it well suited for metal-to-metal joints, fixtures, and close-tolerance components. Technicians working on HVAC equipment housings, electrical enclosures, pump assemblies, and similar trade applications will find this fastener appropriate for tight-clearance installations.

Key Features

• 1/4-28 UNF fine thread for high clamping force and vibration resistance
• Fully threaded shank along the entire 5/8-inch length under head
• 3/16-inch hex socket drive for use with standard hex keys
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides mild corrosion resistance and low-reflectance surface
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw suitable for use in any application requiring a 1/4-28 UNF fully threaded fastener with a 3/16-inch hex drive.

Installation Notes

Installation requires a 3/16-inch hex key or Allen driver; use of the correct drive size prevents rounding of the socket. Ensure the mating tapped hole meets 1/4-28 UNF thread specifications before installation. De-energize and lock out any equipment before accessing fastened components during service or replacement. Follow applicable torque guidelines from the equipment manufacturer or relevant industry standards for the assembly being serviced.