Heli-coil A1185-5EN469 5/16-18 Unc Threaded Insert 0.469 in

Product Description

The HELI-COIL A1185-5EN469 is a free running wire thread insert designed to create or restore strong, wear-resistant internal threads in tapped holes. It accepts a 5/16-18 UNC fastener and measures 0.469 inches in overall length, giving a 1-1/2D length-to-diameter ratio. The coil is formed from stainless steel wire, providing corrosion resistance in demanding environments. A tang is included for installation with a standard HELI-COIL drive tool. This insert is used by machinists, maintenance technicians, and trade professionals who need reliable thread repair or thread reinforcement in metal components.

This insert fits applications where a 5/16-18 UNC internal thread must be installed or restored to original specification. Typical uses include thread repair in aluminum, cast iron, or soft-metal housings found in HVAC equipment, pumps, motors, and general mechanical assemblies. The 6-5/8 free coils engage the parent material uniformly to distribute fastener load across the full insert length, reducing the risk of thread pull-out under torque or vibration. Each package contains one insert, sold with a minimum order quantity of five units.

Key Features

• 5/16-18 UNC thread size for compatibility with standard inch-series fasteners
• 0.469 inch overall length at a 1-1/2D length-to-diameter ratio
• Stainless steel construction for corrosion resistance in wet or chemically exposed environments
• Tanged design for use with standard HELI-COIL installation tools
• 6-5/8 free coils provide uniform load distribution across the threaded engagement zone

Compatibility

Designed as an OEM-style thread insert for any application requiring a 5/16-18 UNC internal thread, including thread repair and thread reinforcement in metal parent materials.

Installation Notes

Installation requires drilling the parent hole to the correct HELI-COIL tap drill size and tapping with the appropriate STI tap before driving the insert. Use the correct HELI-COIL installation tool matched to this thread size to avoid coil damage. After installation, break off the drive tang with a tang break-off tool as required by the application. Always follow applicable shop safety procedures and consult the fastener manufacturer guidelines for torque and preload on the assembled joint.