Holo-krome 72440 Hex Socket Cap Screw 1-1/2-6 Unc

Product Description

The HOLO-KROME 72440 is a heavy-duty hex socket cap screw designed for high-strength fastening in industrial, mechanical, and structural applications. It features a 1-1/2-6 UNC thread size, a 6.5-inch length under head, and a 1-inch hex drive. Constructed from alloy steel with a black oxide finish, this screw delivers strong clamping force while resisting corrosion and surface wear. It is partially threaded, which concentrates clamping load and reduces shear stress at the unthreaded shank. Manufactured to ASME B18.3 and ASTM A574 standards, this fastener meets the dimensional and mechanical requirements expected in precision assemblies and heavy-load connections.

This cap screw is suited for industrial machinery, heavy equipment, structural steel fabrication, and maintenance applications where a reliable, high-torque hex socket fastener is required. The 1-1/2-6 UNC coarse thread provides efficient engagement in steel and cast iron bores. Installers working in manufacturing, maintenance, and construction trades will find this screw appropriate for bolted joints that demand controlled preload and consistent tensile strength. The black oxide coating reduces friction during installation and provides moderate corrosion resistance in dry or lightly oiled environments.

Key Features

• 1-1/2-6 UNC coarse thread for strong engagement in steel and cast iron
• 6.5-inch length under head for deep fastening in thick material sections
• 1-inch hex drive for high-torque installation with standard hex keys or socket drivers
• Partially threaded shank reduces shear stress and increases joint strength
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide finish provides corrosion resistance and reduces galling during installation
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as an OEM-style or maintenance replacement hex socket cap screw for heavy industrial bolted assemblies requiring a 1-1/2-6 UNC coarse thread fastener conforming to ASME B18.3 and ASTM A574 specifications.

Installation Notes

Installation should be performed by qualified mechanical or industrial maintenance technicians using a calibrated torque wrench and the appropriate 1-inch hex key or drive socket. De-energize and lock out all equipment before servicing any fastened assembly per applicable OSHA lockout/tagout procedures. Apply a thread lubricant or anti-seize compound as appropriate for the joint specification to achieve accurate preload from applied torque. Do not exceed the torque rating for the joint material or substitute a lower-grade fastener in its place.