Holo-krome 72274 Hex Socket Cap Screw 5/8-11 Unc Alloy Steel

Product Description

The HOLO-KROME 72274 is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, machinery, and structural connections. It features a 5/8-11 UNC thread size with a fully threaded shank measuring 2-1/4 inches in length under the head. The 1/2-inch hex drive socket accepts a standard hex key or Allen wrench for installation and removal. Constructed from alloy steel with a black oxide finish, this fastener delivers solid corrosion resistance and surface hardness suited to industrial and trade environments. It conforms to ASME B18.3 and ASTM A574 standards, ensuring dimensional and mechanical compliance for precision fastening work.

This cap screw is used across a broad range of applications including HVAC equipment assembly, electrical enclosure mounting, pump and motor mounting, and general mechanical maintenance. The 5/8-11 UNC coarse thread pattern offers reliable engagement in through-hole and tapped-hole installations where vibration resistance and clamping force are priorities. Its black oxide coating reduces light reflection and provides mild protection against oxidation in dry or controlled environments. Installers working in maintenance, fabrication, or original equipment assembly will find this fastener appropriate for medium-to-heavy duty bolted connections.

Key Features

• 5/8-11 UNC coarse thread for strong thread engagement and vibration resistance
• 2-1/4 inches length under head, fully threaded shank for maximum thread contact
• 1/2-inch hex socket drive compatible with standard hex keys and Allen drivers
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide coating provides mild corrosion resistance and reduced surface glare
• Conforms to ASME B18.3 dimensional standards for consistent fitment

Compatibility

Designed as an OEM-style replacement or service fastener for any application requiring a 5/8-11 UNC hex socket cap screw with a 2-1/4-inch length under head, conforming to ASME B18.3 and ASTM A574 standards.

Installation Notes

Installation is performed by mechanics, millwrights, HVAC technicians, or electricians using a 1/2-inch hex key or Allen driver. Always de-energize and lock out equipment before replacing or installing fasteners on live machinery. Verify that the receiving threads are clean, undamaged, and sized for 5/8-11 UNC before installation. Apply thread lubricant or anti-seize compound where specified by the equipment manufacturer to achieve accurate clamp load.