Holo-krome 72408 Hex Socket Cap Screw 1-1/4-7 Unc

Product Description

The HOLO-KROME 72408 is a heavy-duty hex socket cap screw designed for high-strength fastening in demanding industrial and mechanical applications. Manufactured from alloy steel with a black oxide finish, this fastener delivers corrosion resistance and a clean appearance suited to precision assemblies. The screw features a 1-1/4-7 UNC thread size, a 5-inch length under head, and is partially threaded. Drive is via a 7/8-inch hex socket. It conforms to ASME B18.3 and ASTM A574 standards, making it appropriate for structural and load-bearing fastening work where specification compliance is required.

This screw is used in heavy mechanical assemblies, industrial machinery, structural steel fabrication, and equipment maintenance applications where a high-torque, recessed-drive fastener is needed. The partially threaded shank provides a bearing surface that resists shear loads, making it a common choice in flanged connections, mounting plates, and machinery frames. Installation is typically performed by millwrights, maintenance mechanics, and industrial technicians working on equipment requiring ASME-compliant fasteners.

Key Features

• 1-1/4-7 UNC thread size for heavy load-bearing fastening
• 5-inch length under head with partial threading for shear-resistant installations
• 7/8-inch hex socket drive for high-torque application
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 and ASTM A574 compliant hex socket cap screw suitable for use in industrial assemblies requiring a 1-1/4-7 UNC partially threaded fastener with a 7/8-inch hex drive.

Installation Notes

Installation should be performed by qualified mechanical or industrial technicians familiar with high-strength fastener procedures. Use a calibrated 7/8-inch hex key or socket drive to ensure proper seating and to avoid rounding the drive recess. Verify thread engagement depth and mating material strength before torquing. Do not exceed the structural limits of the mating substrate or apply lubricants not specified for the application.