Holo-krome 72106 Hex Socket Cap Screw 1/4-20 Unc

Product Description

The HOLO-KROME 72106 is a hex socket cap screw engineered for demanding fastening applications in mechanical, structural, and industrial assemblies. It features a 1/4-20 UNC thread with a 1-3/4 inch length under head and is driven by a 3/16 inch hex socket. The fastener is manufactured from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and reduces light reflection on finished assemblies. Partial threading along the shank allows for controlled clamping force. This screw conforms to ASME B18.3 and ASTM A574 standards, making it a recognized choice for precision-torque applications across manufacturing, maintenance, and equipment fabrication work.

The 72106 is suited for residential and commercial mechanical applications where a low-profile socket head is required to access recessed or clearance-limited fastener positions. Machinists, millwrights, equipment technicians, and general maintenance professionals install this screw in machine frames, fixtures, jigs, panels, and fabricated steel assemblies. Its partially threaded shank makes it particularly effective in applications requiring the shank to bear shear load while the threaded portion provides the clamping force.

Key Features

• 1/4-20 UNC thread for broad compatibility with standard tapped holes in inch-measurement assemblies
• 1-3/4 inch length under head with partial threading for shear-load-bearing shank sections
• 3/16 inch hex drive for use with standard hex keys and socket drivers
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides mild corrosion resistance and a clean, low-reflectance appearance
• Conforms to ASME B18.3 dimensional standards for consistent fitment in precision applications

Compatibility

Designed as a standard-dimension replacement or stock fastener for any application requiring a 1/4-20 UNC partially threaded hex socket cap screw per ASME B18.3 and ASTM A574 specifications.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 3/16 inch hex key or socket driver. Always ensure the mating tapped hole meets ASME B18.3 tolerances and is free of debris before driving the fastener. De-energize and lock out any equipment before replacing fasteners in powered machinery. Avoid exceeding the torque rating appropriate for 1/4-20 ASTM A574 alloy steel fasteners as specified in the applicable engineering standard or equipment documentation.