Holo-krome 730001840 Hex Socket Cap Screw 3/8-24 Unf

Product Description

The HOLO-KROME 730001840 is a hex socket cap screw designed for applications requiring a high-strength, compact fastener with a recessed drive. Manufactured from alloy steel with a black oxide finish, this screw meets ASME B18.3 and ASTM A574 standards, making it suitable for precision mechanical assemblies and structural fastening in industrial and trade environments. The 5/16-inch hex drive accepts a standard Allen-type key, allowing installation in confined spaces where a wrench or screwdriver cannot reach. Partial threading along the shank provides a smooth bearing surface for shear-load applications. This fastener is handled and installed by millwrights, pipefitters, HVAC technicians, and general mechanical contractors.

This screw is appropriate for both light industrial and heavy mechanical assemblies requiring a fine-thread UNF specification. The 3/8-24 UNF thread pitch offers finer engagement and greater tensile resistance compared to coarse-thread equivalents of the same diameter. The 5.5-inch length under head accommodates thicker stack-up applications such as equipment brackets, flanged assemblies, motor mounts, and structural hardware installations across commercial and industrial settings.

Key Features

• 3/8-24 UNF fine thread for high tensile strength and precise thread engagement
• 5.5-inch length under head suits thick-material and multi-layer fastening applications
• Alloy steel construction meets ASTM A574 high-strength socket screw requirements
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Partially threaded shank supports shear-load and close-tolerance bore applications
• 5/16-inch hex socket drive compatible with standard Allen keys and hex bit drivers

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw suitable for equipment and assemblies specifying a 3/8-24 UNF partially threaded fastener in alloy steel with black oxide finish.

Installation Notes

Installation should be performed by a qualified mechanic or technician familiar with torque specifications for ASTM A574 alloy steel fasteners. De-energize and lock out all equipment before fastening work begins on powered assemblies. Use a properly sized 5/16-inch hex key or socket bit to avoid rounding the drive. Apply thread lubricant or thread-locking compound only where specified by the equipment manufacturer's service documentation.