Heli-coil 4984-10 Hand Sti Tap M10x1 Metric Fine D3

Product Description

The HELI-COIL 4984-10 is a hand STI tap designed for cutting threads in pre-drilled holes to accept Heli-Coil screw thread inserts. Ground to a D3 thread limit with a plug chamfer, it produces 5H class-of-fit threads in the M10x1 metric fine size. The tap is machined from high-speed steel with a bright, uncoated finish and features 4 flutes for reliable chip evacuation. With a thread length of 36.51 millimeters and an overall length of 80.71 millimeters, it is dimensioned specifically for insert-thread repair and new-thread preparation work. Licensed machinists, maintenance technicians, and trade professionals performing thread repair on production or field components are the primary users.

This tap is suited for thread repair and new-thread installation in a range of materials including aluminum, magnesium, mild steel, and stainless steel. It is used wherever a standard thread has been stripped or damaged and a Heli-Coil insert is the chosen repair method. Typical applications include engine components, structural fastener holes, and equipment housings in residential, commercial, and industrial maintenance settings. The plug chamfer provides a gradual thread lead-in, making it appropriate for through-hole tapping operations.

Key Features

• M10x1 metric fine thread size for precise insert-thread fitment
• D3 thread limit ground to 5H class of fit for consistent insert installation
• 4-flute design promotes chip evacuation in a variety of base materials
• Plug chamfer allows smooth thread lead-in for through-hole applications
• High-speed steel construction handles aluminum, magnesium, mild steel, and stainless steel
• Bright, uncoated finish for straightforward visual inspection during use

Compatibility

Designed for use with Heli-Coil STI insert systems in M10x1 metric fine thread applications. Compatible base materials include aluminum, magnesium, mild steel, and stainless steel as stated in manufacturer specifications.

Installation Notes

This tap is intended for use by machinists and qualified trade technicians familiar with thread repair procedures. Always ensure the workpiece is properly secured and the correct tap drill size for the insert system has been used before tapping. Apply appropriate cutting fluid for the base material being tapped to extend tool life and improve thread quality. Follow the tool manufacturer's recommended hand-tapping technique and avoid excessive torque to prevent tap breakage.