Heli-coil A4184-2CN030 Screw-locking Insert M2 X 0.4

Product Description

The HELI-COIL A4184-2CN030 is a tangless screw-locking wire thread insert designed to create a secure, vibration-resistant threaded engagement in parent material. Manufactured from Grade 304 stainless steel with a bright finish, this insert installs into a pre-tapped hole and provides a locking function through a deformed coil section that applies radial pressure on the mating fastener. The M2 x 0.4 metric coarse thread profile and 1-1/2D length ratio make it suited for light-duty fastening applications where thread locking and corrosion resistance are both required. Machinists, MRO technicians, and assembly professionals install this insert using a standard tangless installation tool.

This insert is used in applications requiring reliable thread repair or thread reinforcement in metal, plastic, or composite parent materials. The tangless design eliminates the need for tang removal after installation, reducing the risk of debris in blind-hole assemblies. With a 3 mm overall length and a minimum outside diameter of 2.50 mm, it is well suited for compact assemblies common in electronics, instrumentation, and precision mechanical components where M2 fasteners are standard. A maximum locking torque of 0.12 N/m and a minimum breakaway torque of 0.0030 N/m define the locking performance range.

Key Features

• Grade 304 stainless steel construction with bright finish for corrosion resistance
• Tangless design eliminates post-installation tang removal in blind-hole applications
• M2 x 0.4 metric coarse thread profile, 1-1/2D length ratio
• 3 mm overall insert length with 5-1/2 free coils
• Maximum locking torque of 0.12 N/m with minimum breakaway torque of 0.0030 N/m
• Outside diameter range of 2.50 mm to 2.70 mm for consistent press fit

Compatibility

Designed for use with M2 x 0.4 metric coarse threaded holes prepared to HELI-COIL insert specifications. Requires a compatible tangless installation tool and an appropriately sized insert tap for parent material preparation.

Installation Notes

Installation should be performed by a qualified machinist or assembly technician using a tangless insert installation tool rated for M2 inserts. The parent material must first be drilled and tapped with the correct HELI-COIL insert tap to achieve proper outside diameter engagement. Ensure the work area is clean and free of chips or debris before inserting, particularly in blind-hole applications. Do not attempt installation with standard thread taps or improvised tooling, as this can damage the coil or parent thread.