Heli-coil K1185-20 Free Running Insert 1-1/4-7 Unc

Product Description

The HELI-COIL K1185-20 is a free running helical wire thread insert designed to create or restore a strong, accurate internal thread in a parent material. The insert is manufactured from stainless steel with a bright, uncoated finish, making it well-suited for applications where corrosion resistance matters. It accepts a 1-1/4-7 UNC thread and measures 1.875 inches in overall length, representing a 1-1/2D length-to-diameter ratio. This tanged style includes a drive tang for installation with the appropriate installation tool. Maintenance technicians, machinists, and mechanical assembly professionals install these inserts in threaded repair or thread-build-up applications across industrial and commercial settings.

This insert is used wherever a 1-1/4-7 UNC internal thread must be installed or repaired in a base material. Common scenarios include repairing stripped threads in metal housings, fabricated assemblies, or cast components. The stainless steel construction suits environments with exposure to moisture, mild chemicals, or elevated temperatures. The tanged design requires a matching HELI-COIL installation tool for proper seating, after which the drive tang is broken off flush with the parent material surface once the insert is fully seated.

Key Features

• 1-1/4-7 UNC thread size for standard unified coarse thread applications
• 1.875 inches overall length with a 1-1/2D length-to-diameter ratio
• Stainless steel construction for corrosion resistance
• Bright, uncoated finish with 11-1/4 free coils
• Tanged design for controlled installation with a compatible drive tool
• Single-insert packaging - sold individually

Compatibility

Designed for use in any application requiring a 1-1/4-7 UNC internal thread insert. Requires a HELI-COIL compatible installation tool sized for 1-1/4-7 thread inserts.

Installation Notes

Installation is performed by machinists or mechanical technicians using the correct HELI-COIL tap and installation tool for the 1-1/4-7 thread size. The parent material must be drilled and tapped to the appropriate HELI-COIL insert tap size before the insert is driven in. Once the insert is seated flush or below the surface, break off the drive tang using a tang break-off tool or punch. Do not attempt to install the insert without the proper installation tool, as improper seating can damage the insert or parent material thread.