Heli-coil 2093-3.5 Hand Sti Tap M3.5 X 0.6 Metric Coarse

Product Description

The HELI-COIL 2093-3.5 is a hand STI tap designed to cut internal threads for Heli-Coil wire thread insert installation. Built from high speed steel with a bright finish, this tap produces an M3.5 x 0.6 metric coarse thread to a D2 thread limit and 5H class of fit. It features a bottoming chamfer for threading close to the bottom of blind holes, making it well suited for tight-clearance repair work. With 3 flutes and a 19.05 mm thread length, the tap provides controlled chip evacuation and consistent thread form during hand-tapping operations. Overall length is 53.98 mm.

This tap is used in thread repair and original equipment manufacturing applications where stripped or damaged metric threads must be restored using Heli-Coil inserts. The bottoming chamfer makes it the right choice when the full thread length must reach near the base of a blind hole. Compatible material applications include aluminum, magnesium, mild steel, and stainless steel. It is commonly used by machinists, maintenance technicians, and field service professionals working on mechanical assemblies, engine components, and structural fastener points.

Key Features

• M3.5 x 0.6 metric coarse thread form for STI Heli-Coil insert preparation
• Bottoming chamfer allows threading to the base of blind holes
• High speed steel construction handles aluminum, magnesium, mild steel, and stainless steel
• D2 thread limit with 5H class of fit for consistent insert sizing
• 3-flute design promotes controlled chip flow during hand-tapping
• Bright finish for corrosion resistance during storage and use

Compatibility

Designed for use in Heli-Coil STI thread insert systems requiring an M3.5 x 0.6 metric coarse tapped hole. Suitable for use in aluminum, magnesium, mild steel, and stainless steel workpieces.

Installation Notes

This tap is intended for hand operation using a standard tap wrench. Before tapping, ensure the pilot hole is drilled to the correct STI tap drill diameter specified for M3.5 x 0.6 Heli-Coil inserts. Apply cutting fluid appropriate to the workpiece material to extend tap life and improve thread finish. Do not power-drive a hand tap, as over-torquing can cause breakage, particularly in harder alloys like stainless steel.