Holo-krome 72402 Hex Socket Cap Screw 1-1/4-7 Unc Alloy Steel

Product Description

The HOLO-KROME 72402 is a hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and trade installations. It features a 1-1/4-7 UNC thread size with full threading along a 3-1/2 inch length under head. The drive is a 7/8 inch internal hex socket, requiring an Allen-style hex key or socket driver for installation and removal. Constructed from alloy steel with a black oxide finish coating, this fastener delivers corrosion resistance and reduces light reflection in service environments. It conforms to ASME B18.3 and ASTM A574 fastener standards, making it suitable where specification-grade hardware is required.

This screw is used in heavy-duty mechanical assemblies, equipment fabrication, structural connections, and industrial maintenance where a high-tensile, flush-head fastener is called for. The socket cap head style suits applications where clearance is limited and a wrench or open-end tool cannot be used. Typical installers include millwrights, pipefitters, equipment mechanics, and maintenance technicians working on machinery, frames, and structural components.

Key Features

• 1-1/4-7 UNC thread size for heavy load-bearing fastening
• 3-1/2 inch length under head, fully threaded
• 7/8 inch hex socket drive for torque-efficient installation
• Alloy steel construction meets ASTM A574 strength requirements
• Black oxide finish provides mild corrosion resistance and reduces surface glare
• Conforms to ASME B18.3 fastener standard

Compatibility

Designed as a specification-grade hex socket cap screw for use in applications requiring ASME B18.3 and ASTM A574 compliance. Suitable for standard 1-1/4-7 UNC tapped holes in industrial and mechanical assemblies.

Installation Notes

Installation requires a calibrated torque wrench and a correctly sized 7/8 inch hex key or socket driver. Power down and de-energize any adjacent equipment before working on mechanical assemblies. Thread engagement depth should be verified against the tapped hole specification prior to torquing. Follow applicable industry standards and equipment manufacturer guidelines for torque requirements specific to the assembly.