Holo-krome 73054 Hex Socket Cap Screw 1/4-28 Unf Alloy Steel

Product Description

The HOLO-KROME 73054 is a hex socket cap screw designed for high-strength fastening applications in mechanical, HVAC, plumbing, and industrial assembly work. Manufactured from alloy steel and finished with a black oxide coating, this screw offers reliable tensile strength and moderate corrosion resistance in dry or lightly oiled environments. The 1/4-28 UNF thread form provides fine-pitch engagement suited to precision assemblies and thin-material applications. The 3/16-inch hex drive accepts a standard hex key or Allen driver. This fastener is fully threaded along its 3/8-inch length under the head, maximizing thread engagement in shallow blind holes and thin boss configurations.

This screw is suited for use in equipment panels, mechanical enclosures, pump housings, valve assemblies, and other hardware where a flush-profile socket cap head and fine-thread engagement are required. Trade installers working on HVAC equipment, refrigeration frames, or plumbing fixture brackets commonly use this fastener where vibration resistance and tight clearance favor a fine-thread, recessed-drive cap screw. Fully threaded construction makes it particularly useful in short-length, high-clamping-force joints.

Key Features

• 1/4-28 UNF fine thread for precise engagement and vibration resistance
• Fully threaded 3/8-inch length under head maximizes grip in shallow applications
• Alloy steel construction provides high tensile and shear strength
• Black oxide finish for moderate corrosion resistance in dry or lightly lubricated environments
• 3/16-inch hex socket drive compatible with standard hex keys and Allen drivers
• Meets ASME B18.3 and ASTM A574 fastener standards

Compatibility

Designed as an OEM-style replacement or standard-use hex socket cap screw for any application requiring a 1/4-28 UNF fully threaded fastener with a 3/8-inch length under head and a 3/16-inch hex drive.

Installation Notes

Installation is performed with a 3/16-inch hex key or Allen driver; use of a calibrated torque wrench is recommended to avoid thread stripping in alloy or cast housings. Ensure mating threads are clean and free of debris before driving. Black oxide fasteners may benefit from a light application of thread lubricant or anti-seize compound in corrosive or outdoor-adjacent environments. Follow applicable mechanical codes and equipment manufacturer torque specifications for the assembly being serviced.