Heli-coil A1191-8CN1000 1/2-20 Unf Insert 1 Inch

Product Description

The HELI-COIL A1191-8CN1000 is a free running wire thread insert designed to repair or reinforce internal threads in parent material. It installs into a specially tapped hole and forms a permanent, wear-resistant thread that accepts standard fasteners. The insert is manufactured from 304 stainless steel with a bright, uncoated finish and measures 1 inch overall length, corresponding to a 2D length-to-diameter ratio for the 1/2-20 UNF thread size. The tanged design allows installation with a standard insert driving tool. This insert is used by machinists, maintenance technicians, aerospace mechanics, and general industrial trades where thread repair or thread reinforcement is required in metal or composite assemblies.

This insert is suited for applications requiring a strong, corrosion-resistant thread form in materials prone to thread stripping, including aluminum, magnesium, cast iron, and plastics. The 1/2-20 UNF thread size is common in precision mechanical assemblies, automotive components, and aerospace hardware. The 2D insert length provides a full-depth thread engagement appropriate for high-load fastener applications. The 304 stainless steel construction resists corrosion in wet or chemically exposed environments. Machinists and field maintenance technicians typically install this insert as part of a thread repair procedure using the appropriate HELI-COIL tap and installation tool for the 1/2-20 thread size.

Key Features

• 1/2-20 UNF thread size with 1 inch overall insert length (2D length-to-diameter ratio)
• 304 stainless steel construction for corrosion resistance in demanding environments
• Tanged design compatible with standard insert driving tools for controlled installation
• Bright, uncoated finish suitable for applications requiring clean thread engagement
• 16-7/8 free coils for consistent thread form and load distribution
• Restores or reinforces stripped or damaged internal threads to OEM specification

Compatibility

Designed as an OEM-style free running thread insert for 1/2-20 UNF tapped holes prepared with the appropriate HELI-COIL tap and installation tooling for 2D insert length applications.

Installation Notes

Installation is typically performed by a machinist or qualified maintenance technician. The parent material must be re-tapped using the correct HELI-COIL tap for the 1/2-20 insert size before the insert is driven. Use the specified insert installation tool to drive the insert to the correct depth without deforming the coils. After installation, break off the driving tang using a tang break-off tool if required by the application.