Holo-krome 72392 Hex Socket Cap Screw 1-8 Unc Alloy Steel

Product Description

The HOLO-KROME 72392 is a partially threaded hex socket cap screw designed for high-strength bolted connections in industrial, mechanical, and trade applications. It features a 1-8 UNC thread size, a 6.5-inch length under head, and a 3/4-inch hex drive socket. The fastener is manufactured from alloy steel and finished with a black oxide coating that provides moderate corrosion resistance and reduces surface reflectivity. It conforms to ASME B18.3 and ASTM A574 standards, which define the dimensional and mechanical property requirements for socket cap screws in demanding service environments. Licensed mechanics, millwrights, and maintenance technicians typically install this fastener in machinery, structural assemblies, and equipment frames.

This screw is suited for applications requiring high clamping force in a compact-head fastener format. The partial threading allows full thread engagement in tapped holes while providing a smooth shank section that resists shear loading. Common install scenarios include machine bases, heavy equipment housings, hydraulic manifold mounting, and structural steel fabrication where a recessed drive profile is required to clear surrounding geometry.

Key Features

• 1-8 UNC thread form for high clamping load capacity in coarse-thread tapped holes
• 6.5-inch length under head accommodates thick stack-ups and deep clearance requirements
• 3/4-inch hex socket drive for use with standard hex keys and socket drivers
• Partial threading preserves a full shank section for shear resistance
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide finish reduces bare metal exposure and light reflection in service

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for applications specifying a 1-8 UNC partially threaded hex socket cap screw conforming to ASME B18.3 and ASTM A574.

Installation Notes

Installation should be performed by qualified mechanics or maintenance technicians using a calibrated torque wrench and the appropriate 3/4-inch hex key or socket bit. Always verify that the mating tapped hole thread class and material are compatible with the fastener grade before assembly. De-energize and lockout all equipment before replacing structural fasteners in machinery or powered assemblies. Follow applicable industry torque guidelines for the fastener grade and lubrication condition specified in the equipment service documentation.