Holo-krome 72384 Hex Socket Cap Screw 1-8 Unc Alloy Steel

Product Description

The HOLO-KROME 72384 is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling fixtures, and industrial equipment. It features a 1-8 UNC thread size with a 4.5-inch length under head and is partially threaded for proper load-bearing engagement. The 3/4-inch hex drive accepts a standard hex key or Allen wrench. Constructed from alloy steel with a black oxide coating, this fastener delivers strong tensile performance and moderate corrosion resistance in controlled environments. It meets ASME B18.3 and ASTM A574 standards, making it suitable for demanding mechanical and structural fastening work.

This cap screw is used in applications requiring a recessed-drive, high-strength fastener where a flush or low-profile head is necessary. Typical installations include machine bases, jigs, press frames, and heavy equipment assemblies. The partial threading is standard for longer-length cap screws, allowing the unthreaded shank to bear shear loads while the threaded portion engages the tapped hole. It is commonly installed by machinists, millwrights, and maintenance technicians working on industrial or commercial equipment.

Key Features

• 1-8 UNC thread size for use with standard coarse-thread tapped holes in steel and iron components
• 4.5-inch length under head accommodates deep-clearance or thick-material fastening applications
• Partially threaded shank improves shear load performance in structural joints
• 3/4-inch hex socket drive requires a standard hex key for installation and removal
• Alloy steel construction meets ASTM A574 for high tensile and proof load requirements
• Black oxide finish provides a uniform appearance and mild surface protection against oxidation

Compatibility

Designed as an OEM-style and aftermarket replacement hex socket cap screw for machinery, fixtures, and assemblies using 1-8 UNC coarse-thread fasteners conforming to ASME B18.3 standards.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician using the correct 3/4-inch hex key or T-handle driver. Always confirm the tapped hole thread class and depth before installation to avoid cross-threading or bottoming out the fastener. Clean and inspect the mating threads before torquing. Do not use an impact driver on socket cap screws without a proper hex bit socket rated for the drive size.