Holo-krome 720004520 Hex Socket Cap Screw 1-1/2-6 Unc

Product Description

The HOLO-KROME 720004520 is a heavy-duty hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. This fastener measures 12 inches in length under the head with a 1-1/2-6 UNC thread size and is partially threaded along its shank. Drive engagement is through a 1-inch internal hex socket, requiring a matching hex key or Allen-style driver. Constructed from alloy steel with a black oxide coating, it delivers strong corrosion resistance and reduced surface reflectivity. At 7.17 pounds, this is a substantial fastener suited for demanding load-bearing connections.

This cap screw is used in heavy industrial machinery, structural steel fabrication, tooling fixtures, and equipment frames where large-diameter, high-strength fasteners are required. The 1-1/2-6 UNC coarse thread profile is well suited for thick-material applications where thread engagement depth and pullout resistance are critical. It is typically installed by millwrights, industrial maintenance technicians, or mechanical contractors working on capital equipment and heavy assemblies. The partial threading allows the unthreaded shank to serve as a precision shoulder in close-tolerance bores.

Key Features

• 1-1/2-6 UNC coarse thread for high pullout strength in thick materials
• Partially threaded shank provides a precision shoulder for close-tolerance bore applications
• 1-inch hex drive socket for high-torque installation with standard hex tooling
• Alloy steel construction meets ASME B18.3 and ASTM A574 standards
• Black oxide finish reduces surface corrosion and glare in industrial environments
• 12-inch length under head accommodates deep stack-ups and thick flanged joints

Compatibility

Designed as an OEM-style replacement or direct-use fastener for heavy industrial assemblies requiring 1-1/2-6 UNC hex socket cap screws conforming to ASME B18.3 and ASTM A574.

Installation Notes

Installation should be performed by qualified millwrights or mechanical technicians familiar with large-diameter fastener torque requirements. Always de-energize and lock out equipment before fastener service per OSHA lockout/tagout procedures. Use a properly rated 1-inch hex key or drive tool to avoid socket damage during installation. Consult applicable engineering drawings or equipment manuals for torque specifications, as none are provided with this part number.