Heli-coil A3591-3CNW190 Screw-locking Insert 10-32 Unf

Product Description

The HELI-COIL A3591-3CNW190 is a tangless screw-locking helical insert designed to create a strong, vibration-resistant threaded hole in parent materials ranging from soft alloys to plastics. Manufactured from Grade 304 stainless steel with a dry film lubricant finish, it accepts a 10-32 UNF internal thread and measures 0.19 inches in overall length at a 1D length-to-diameter ratio. The tangless design eliminates the need for tang break-off after installation, reducing debris risk in assembled components. Installation is performed by licensed maintenance technicians, aerospace assemblers, and precision mechanical trades requiring reliable thread repair or new thread formation.

This insert is suited for applications demanding corrosion resistance and controlled locking torque in tight tolerances. The 10-32 UNF thread size is common in instrumentation, electronics enclosures, HVAC control panels, light mechanical assemblies, and other applications where fine-thread engagement is required. The dry film lubricant finish reduces galling during installation and supports consistent torque values across repeated assembly cycles. It is appropriate for both new thread formation and thread repair scenarios.

Key Features

• Tangless design eliminates post-installation tang removal and reduces contamination risk
• Grade 304 stainless steel construction provides corrosion resistance in wet or chemically active environments
• Dry film lubricant finish supports consistent installation and reduces galling
• Maximum locking torque of 13 inch-pounds with a minimum break-away torque of 2 inch-pounds
• Outside diameter range of 0.236 to 0.256 inches for controlled fit in drilled parent material
• 4-1/8 free coils at 1D length-to-diameter ratio for reliable thread engagement depth

Compatibility

Designed as an OEM-style screw-locking helical insert for 10-32 UNF threaded holes in parent materials requiring a 1D insert length.

Installation Notes

Installation requires a properly sized HELI-COIL tap and the appropriate tangless installation tool for the 10-32 insert series. Ensure the parent material bore is clean and free of debris before driving the insert to the specified depth. Power down any energized assembly before performing thread repair or installation in control panels or electrical enclosures. Do not use standard tang-type installation tools with tangless inserts, as tool compatibility affects final seating and locking performance.