Holo-krome 72321 Hex Socket Cap Screw 3/4-10 Unc

Product Description

The HOLO-KROME 72321 is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, machinery, and structural connections. It features a 3/4-10 UNC thread size with a 3-3/4 inch length under head and a 5/8 inch hex drive socket. Constructed from alloy steel with a black oxide coating, this screw delivers high tensile strength and moderate corrosion resistance. The partially threaded shank allows for precise clamping and shear load transfer in bolted joints. Licensed mechanics, millwrights, and maintenance technicians working on industrial and commercial equipment are the primary installers of this fastener.

This cap screw is suited for use in heavy machinery, industrial equipment mounts, structural steel assemblies, and mechanical fixtures requiring a secure, recessed-drive fastening solution. The black oxide finish reduces surface reflectivity and provides light corrosion protection in dry or mildly humid environments. Conformance to ASME B18.3 and ASTM A574 standards makes this fastener appropriate for applications where dimensional and mechanical property verification is required by spec or inspection protocol.

Key Features

• 3/4-10 UNC thread for standard coarse-thread bolted connections
• 3-3/4 inch length under head with partial threading for shear-load and clamping applications
• 5/8 inch hex socket drive for use with standard hex keys or socket drivers
• Alloy steel construction provides high tensile and yield strength
• Black oxide coating offers light corrosion resistance and low surface reflectivity
• Meets ASME B18.3 and ASTM A574 dimensional and mechanical property standards

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 3/4-10 UNC coarse-thread fastener with a 3-3/4 inch length under head and 5/8 inch hex drive.

Installation Notes

Installation is performed by millwrights, maintenance mechanics, or other qualified tradespeople using a 5/8 inch hex key or socket driver. Verify mating thread condition and hole depth before installation. Apply thread lubricant or anti-seize as required by the joint specification. Torque to the value specified in the applicable engineering or equipment documentation - do not estimate torque without a calibrated torque wrench.