Holo-krome 77510 Hex Socket Cap Screw 3/8-24 Unf 5 in

Product Description

The HOLO-KROME 77510 is a hex socket cap screw designed for high-strength fastening applications requiring a clean, low-profile head and internal-drive access. The screw features a 3/8-24 UNF thread - a fine-pitch unified thread that provides greater thread engagement and resistance to vibration loosening compared to coarse-pitch alternatives. With a 5-inch length under head and partial threading, this fastener is suited for through-bolting and clamped-joint assemblies where full threading is not required. Manufactured from alloy steel with a black oxide finish, it offers corrosion resistance and a controlled surface hardness appropriate for demanding mechanical environments.

This fastener is used across industrial, mechanical, and trade applications including HVAC equipment assemblies, electrical enclosures, plumbing equipment mounts, and general mechanical fabrication. The 3/8-24 UNF thread size is common in precision assemblies and equipment manufactured to tighter tolerances. The 5/16-inch hex drive accepts a standard hex key or Allen-head driver bit. Installation is typically performed by mechanics, millwrights, or field service technicians working on equipment with accessible fastener heads.

Key Features

• 3/8-24 UNF fine-pitch thread for improved vibration resistance and precise torque control
• 5-inch length under head with partial threading for through-bolt clamping applications
• Alloy steel construction meets ASME B18.3 and ASTM A574 standards
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• 5/16-inch hex socket drive compatible with standard hex keys and driver bits

Compatibility

Designed as an OEM-style and general-use replacement hex socket cap screw for assemblies requiring a 3/8-24 UNF thread, 5-inch length under head, and 5/16-inch hex drive conforming to ASME B18.3 and ASTM A574 specifications.

Installation Notes

Installation requires a 5/16-inch hex key or hex driver bit. Ensure mating threads are clean and free of debris before installation. Apply thread lubricant or thread-locking compound as required by the equipment manufacturer or applicable mechanical code. De-energize and lock out all equipment before performing fastener service on live assemblies.