Heli-coil A1185-04EN112 4-40 Unc Threaded Insert 0.112 in

Product Description

The HELI-COIL A1185-04EN112 is a free running helical wire thread insert designed to create durable, wear-resistant internal threads in parent materials that require reinforcement or thread repair. This tanged insert measures 0.112 inches overall length with a 4-40 UNC thread profile and a 1D length-to-diameter ratio, placing it in the standard short-length category. Constructed from 18-8 stainless steel, it delivers corrosion resistance suitable for demanding service environments. With 2-3/4 free coils, it provides consistent thread engagement. Licensed trades and maintenance professionals use these inserts to restore or establish high-integrity threads in metal assemblies.

This insert is suited for applications where a 4-40 UNC thread must be installed or restored in aluminum, cast iron, magnesium, plastics, or other base materials. Common install scenarios include precision instrument housings, electrical enclosures, control panels, and mechanical assemblies where standard tapped threads are prone to stripping or wear. The free running design allows the mating fastener to turn freely without locking action, making it appropriate for standard bolted connections rather than prevailing-torque applications.

Key Features

• 4-40 UNC thread size for standard unified coarse thread applications
• 0.112 inches overall length with 1D length-to-diameter ratio
• Tanged design for installation with standard HELI-COIL insertion tools
• 18-8 stainless steel construction for corrosion resistance
• 2-3/4 free coils for consistent thread engagement across the insert length
• Free running configuration allows unrestricted fastener rotation without locking

Compatibility

Designed as an OEM-style free running threaded insert compatible with 4-40 UNC tapped holes prepared with the appropriate HELI-COIL tap and installation tool for this thread size and insert length.

Installation Notes

Installation requires a HELI-COIL-compatible tap to prepare the parent hole to the correct oversize diameter before insert placement. Use the matching installation tool for the 4-40 insert size to drive the insert to the proper depth without distorting the coil. After installation, break off the tang at the notch using a tang break-off tool or needle-nose pliers if the tang is not required to remain. Always follow torque specifications for the mating fastener as determined by the base material and joint design.