Heli-coil A1191-3EN380 Free Running Insert 10-32 0.38in

Product Description

The HELI-COIL A1191-3EN380 is a tanged, free running helical wire thread insert designed to create or restore strong internal threads in parent materials that cannot support a reliable thread on their own. Manufactured from 18-8 stainless steel, it provides corrosion resistance and durability in demanding service environments. The insert is sized for a 10-32 Unified National Fine thread and measures 0.38 inches in overall length, representing a 2D length-to-diameter ratio. With 9-1/2 free coils, it installs using a standard HELI-COIL installation tool and is seated by driving the tang during insertion. Machinists, maintenance technicians, and field service professionals use this type of insert for thread repair and thread reinforcement work.

This insert is suited for applications where a 10-32 UNF thread is required in soft or damaged parent material, including aluminum housings, castings, and plastic substrates. Typical uses include aerospace maintenance, automotive repair, industrial equipment service, and general MRO work. The tanged design allows controlled installation depth and is compatible with standard HELI-COIL tang-break tools once the insert is seated at the correct depth.

Key Features

• 10-32 Unified National Fine thread profile for precise thread fit
• 0.38 inches overall length with a 2D length-to-diameter ratio
• 18-8 stainless steel construction for corrosion resistance
• Tanged design for controlled installation with standard insertion tools
• 9-1/2 free coils for full thread engagement across insert length

Compatibility

Designed as an OEM-style thread repair and thread reinforcement insert for parent materials tapped to the HELI-COIL 10-32 UNF specification.

Installation Notes

Installation should be performed by a qualified machinist or trained maintenance technician using the appropriate HELI-COIL tap and installation tool for the 10-32 insert size. The parent material must be pre-tapped with the correct HELI-COIL oversized tap before the insert is driven in. After the insert is seated flush or slightly below the surface, break off the tang using a tang-break tool where required by the application. Follow all applicable shop safety practices when operating taps and rotary tools.