Heli-coil A3585-04EN224 Screw-locking Insert 4-40 Unc

Product Description

The HELI-COIL A3585-04EN224 is a tangless screw-locking helical coil insert designed to create a durable, vibration-resistant threaded hole in softer base materials. Built from 18-8 stainless steel, it accepts a 4-40 UNC fastener and provides a 2D length-to-diameter ratio with an overall length of 0.224 inches. The tangless design eliminates the need for tang break-off during installation, reducing debris and simplifying the process. With a maximum locking torque of 48 oz-in and a minimum breakaway torque of 10 oz-in, this insert delivers reliable thread locking without adhesives. It is installed by licensed technicians and maintenance professionals across aerospace, HVAC, electrical, and general mechanical applications.

This insert is suited for light-duty threaded repair and new-installation applications where a 4-40 UNC thread form is required in aluminum, magnesium, plastic, or other materials with lower shear strength than the fastener. The 2D configuration provides a compact, space-saving thread engagement in confined areas. The stainless steel construction resists corrosion in environments where moisture or chemical exposure is a concern. Each package contains one insert.

Key Features

• Tangless design eliminates tang break-off debris during and after installation
• 18-8 stainless steel construction for corrosion resistance
• 4-40 UNC thread size with 2D length-to-diameter ratio
• Maximum locking torque of 48 oz-in provides secure vibration-resistant thread locking
• Minimum breakaway torque of 10 oz-in for controlled removal when needed
• Compact 0.224-inch overall length fits tight installation spaces

Compatibility

Designed as an OEM-style threaded insert for applications requiring a 4-40 UNC internal thread in materials with insufficient shear strength for direct tapping.

Installation Notes

Installation requires a properly sized HELI-COIL tap and a compatible tangless insert installation tool. Always power down or de-energize any equipment before drilling and tapping operations. The host material bore must be tapped to the correct insert-thread specification before the insert is driven in. Follow applicable mechanical and electrical codes when repairing threaded holes in service equipment.