Heli-coil A4184-2.5CNW025 Threaded Insert M2.5 X 0.45

Product Description

The HELI-COIL A4184-2.5CNW025 is a screw-locking helical wire threaded insert designed to create durable, vibration-resistant internal threads in tapped holes. Manufactured from Grade 304 stainless steel with a dry film lubricant finish, this insert provides reliable locking performance in demanding fastening applications. It carries an M2.5 x 0.45 metric coarse thread profile with a 1D length-to-diameter ratio and an overall insert length of 2.50 mm. The tangless design eliminates the need for tang removal after installation, reducing assembly steps and the risk of loose fragments in the assembly. Maintenance technicians and assembly professionals working with precision mechanical equipment install this insert wherever thread repair or thread reinforcement is required in small-bore applications.

This insert is suited for light industrial, aerospace, and precision mechanical applications where a small metric thread must be locked against loosening under vibration or dynamic loading. The M2.5 x 0.45 size is commonly used in instrumentation housings, small motor assemblies, and other compact equipment where thread stripping in softer parent materials is a concern. The stainless steel construction makes it appropriate for environments with mild corrosion exposure. One insert is included per package, with a minimum order quantity of 10 units.

Key Features

• Tangless design eliminates post-installation tang removal for faster, cleaner assembly
• Grade 304 stainless steel construction offers corrosion resistance in mild service environments
• Dry film lubricant finish aids installation and reduces galling during thread engagement
• Locking thread coil resists loosening under vibration with a maximum locking torque of 0.22 N/m and minimum breakaway torque of 0.06 N/m
• M2.5 x 0.45 metric coarse thread with 1D length ratio fits precision small-bore tapped holes
• Outside diameter range of 3.20 mm to 3.70 mm for consistent fitment in standard HELI-COIL prepared holes

Compatibility

Designed for use in standard HELI-COIL M2.5 x 0.45 metric coarse prepared tapped holes requiring a 1D screw-locking insert. No specific compatible model numbers were identified in the product data.

Installation Notes

Installation of threaded inserts is typically performed by mechanical assembly technicians using the correct HELI-COIL installation tool for the M2.5 x 0.45 thread size. The parent material must be drilled and tapped to the proper HELI-COIL specification before insert installation. Tangless inserts require a compatible tangless installation mandrel and do not require a tang extraction step after seating. Always verify the installed insert is flush with or slightly below the surface of the parent material before final assembly.