Holo-krome 60148 Flat Socket Cap Screw 5/8-11 X 2 in

Product Description

The HOLO-KROME 60148 is a flat socket cap screw designed for flush or countersunk fastening applications in metalworking, machinery, and industrial assembly. It features an 82-degree flat head with a 3/8-inch hex socket drive and is manufactured from alloy steel with a black oxide finish. The screw measures 5/8-11 UNC thread by 2 inches in overall length and is fully threaded, providing consistent clamping force along the entire shank. With a hardness rating of 37 to 44 HRC, this fastener is built for high-strength applications where a low-profile head is required. It meets ASME B18.3 and ASTM F835 standards and carries a Thread Fit Class of 3A.

This flat socket cap screw is well suited for use in machine tool fixtures, jigs, molds, and structural assemblies where the fastener head must sit flush with or below the work surface. The black oxide finish provides moderate corrosion resistance in indoor and light-duty environments. It is commonly installed by machinists, millwrights, and maintenance technicians working in manufacturing, fabrication, and industrial maintenance settings. The 5/8-11 UNC thread size and 2-inch length make it a standard choice for medium to heavy fastening tasks requiring controlled torque and precise fit.

Key Features

• 82-degree flat head seats flush in standard countersunk holes per ASME B18.3
• 3/8-inch hex socket drive for use with standard hex keys and socket drivers
• Fully threaded along the 2-inch overall length for maximum thread engagement
• Alloy steel construction with 37 to 44 HRC hardness for high-strength applications
• Black oxide finish provides moderate corrosion resistance in dry indoor environments
• Thread Fit Class 3A ensures tight, precise mating with standard UNC tapped holes

Compatibility

Designed for use in standard 5/8-11 UNC tapped holes requiring a countersunk flat-head fastener per ASME B18.3 and ASTM F835 specifications.

Installation Notes

Installation is typically performed by machinists or maintenance technicians using a calibrated hex key or socket driver sized to 3/8 inch. Ensure the mating hole is properly countersunk to 82 degrees before installation to achieve full flush seating. Torque to the fastener manufacturer's specification for the applicable material and joint condition. Always verify thread fit and hole cleanliness before driving to avoid galling or cross-threading in alloy or hardened workpieces.