Heli-coil A4184-4CNW060 M4 X 0.70 Screw-locking Insert

Product Description

The HELI-COIL A4184-4CNW060 is a tangless, screw-locking wire thread insert designed to create durable, vibration-resistant threads in tapped holes. Manufactured from Grade 304 stainless steel with a dry film lubricant finish, this insert accepts an M4 x 0.70 metric coarse thread and has an overall length of 6 millimeters, corresponding to a 1-1/2D length-to-diameter ratio. The tangless design eliminates the need for tang break-off after installation, reducing the risk of debris contamination in the bore. It is intended for use by machinists, maintenance technicians, and assembly professionals working in applications where thread repair or thread reinforcement is required.

This insert is suited for metal assemblies, industrial machinery, and precision equipment where vibration or repeated fastener removal could compromise parent-material threads. The locking feature - built into the coil geometry rather than a chemical coating - provides consistent prevailing torque on installed fasteners. It is appropriate for both new-build thread reinforcement and field or shop thread-repair applications across aerospace, industrial, and general manufacturing environments.

Key Features

• Tangless design eliminates post-installation tang removal and reduces contamination risk
• Grade 304 stainless steel construction provides corrosion resistance in harsh environments
• Dry film lubricant finish aids installation torque control
• Screw-locking coil geometry delivers prevailing torque without adhesives or inserts
• Maximum locking torque of 0.90 N/m with minimum breakaway torque of 0.16 N/m
• 6-1/8 free coils within a 6 mm overall insert length for consistent thread engagement

Compatibility

Designed as an OEM-style thread insert for M4 x 0.70 metric coarse threaded holes requiring a 1-1/2D insert length in steel, aluminum, or other parent materials.

Installation Notes

Installation requires a properly tapped hole using the correct HELI-COIL tap specified for M4 x 0.70 inserts. A compatible tangless installation tool should be used to drive the insert to the correct depth. Power down any equipment and secure the workpiece before tapping or installing the insert. Do not use standard tang-style installation tools with tangless inserts, as this will damage the insert and the parent thread.