Holo-krome 72438 Hex Socket Cap Screw 1-1/2-6 Unc

Product Description

The HOLO-KROME 72438 is a heavy-duty hex socket cap screw designed for high-strength fastening applications in industrial and mechanical assemblies. It features a 1-1/2-6 UNC thread with a 6-inch length under head and is partially threaded for proper engagement in thick-section joints. The drive is a 1-inch internal hex socket, requiring a matching hex key or Allen driver. Manufactured from alloy steel with a black oxide finish, this fastener offers good corrosion resistance in low-moisture environments and meets ASME B18.3 and ASTM A574 standards. It weighs approximately 4.323 pounds per piece.

This screw is used in heavy structural, tooling, machine frame, and equipment assembly applications where a high-tensile socket-head fastener is required. The large 1-1/2-inch diameter and coarse 6 UNC thread pitch make it suitable for thick-plate clamping and fixture work where maximum clamp load is critical. It is commonly installed by millwrights, industrial maintenance technicians, and mechanical assemblers working on presses, dies, machine bases, and similar heavy equipment.

Key Features

• 1-1/2-6 UNC coarse thread provides high clamp load in thick-section assemblies
• 6-inch length under head with partial threading for through-bolt and blind-hole applications
• 1-inch internal hex socket drive for high-torque installation
• Alloy steel construction meets ASTM A574 high-strength socket screw standard
• Black oxide finish provides moderate corrosion resistance and reduced light reflection
• Conforms to ASME B18.3 dimensional standard for socket cap screws

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 1-1/2-6 UNC partially threaded fastener in alloy steel with black oxide finish.

Installation Notes

Installation should be performed by a qualified millwright or mechanical technician using a calibrated torque wrench and a proper 1-inch hex key or drive bit. Ensure mating threads are clean and free of debris before assembly. Always derate published torque values when using black oxide fasteners without additional lubrication, as surface coating affects friction coefficients. Follow applicable industry standards and equipment OEM specifications for final torque requirements.