Holo-krome 72280 Hex Socket Cap Screw 5/8-11 Unc 3 in

Product Description

The HOLO-KROME 72280 is a hex socket cap screw designed for high-strength fastening applications where a clean, recessed drive is required. Sized at 5/8-11 UNC with a 3-inch length under head, this fastener is partially threaded and driven with a 1/2-inch hex key. Constructed from alloy steel with a black oxide finish, it delivers reliable clamping force while resisting surface corrosion in indoor and sheltered environments. It meets ASME B18.3 and ASTM A574 standards, confirming dimensional accuracy and minimum tensile strength requirements expected in professional mechanical assemblies.

This screw is suited for use in heavy machinery, structural fixtures, industrial equipment mounting, and mechanical assemblies where high-torque socket drive fasteners are specified. The 5/8-11 UNC thread is a coarse-thread series commonly used in steel fabrication, manufacturing maintenance, and OEM equipment builds. Machinists, millwrights, and maintenance mechanics regularly use this fastener series when assembling flanged components, bearing housings, and machine bases that require consistent, repeatable clamp loads.

Key Features

• 5/8-11 UNC coarse thread for broad compatibility with standard tapped holes in steel assemblies
• 3-inch length under head with partial threading for load-bearing grip in thick material applications
• 1/2-inch hex socket drive for high-torque installation with standard hex keys or socket tooling
• Alloy steel construction meets ASTM A574 minimum tensile strength requirements
• Black oxide finish provides mild corrosion resistance and reduces light glare on fastener heads
• Conforms to ASME B18.3 dimensional standards for drop-in replacement in spec-controlled applications

Compatibility

Designed as an OEM-style replacement or direct-specification hex socket cap screw for industrial machinery, structural assemblies, and mechanical equipment requiring 5/8-11 UNC coarse-thread fasteners.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance mechanics using a calibrated torque wrench with a 1/2-inch hex bit. De-energize and lock out all equipment before fastener installation or removal per applicable OSHA lockout/tagout procedures. Ensure the tapped hole is clean and free of debris before threading. Do not exceed the rated torque range for the fastener grade and thread size as specified in published ASME or ASTM torque tables.