Heli-coil 2093-8 Hand Sti Tap M8 X 1.25 Metric Coarse

Product Description

The HELI-COIL 2093-8 is a hand STI tap designed for cutting threads in prepared insert bores to accept HELI-COIL wire thread inserts. Ground to an M8 x 1.25 metric coarse thread form with a 5H class of fit, this tap produces the oversized internal thread that a wire insert requires for proper seating. The four-flute, high-speed steel construction delivers clean chip evacuation and edge retention across repeated use. The bottoming chamfer allows threading close to the bottom of blind holes, making it a practical choice for tight-clearance applications on production lines and field repair work alike. Licensed machinists, millwrights, and maintenance technicians are the primary users.

This tap is suited for thread repair and new thread installation in aluminum, magnesium, mild steel, and stainless steel workpieces. It is commonly used in automotive, aerospace, and general industrial maintenance settings where damaged or stripped metric threads must be restored to full-strength condition using HELI-COIL inserts. The bottoming chamfer design makes it especially useful in blind-hole applications where a taper or plug chamfer would leave insufficient full threads near the base of the bore.

Key Features

• M8 x 1.25 metric coarse thread form with 5H class of fit for HELI-COIL insert installation
• Bottoming chamfer enables threading to the base of blind holes
• Four flutes for efficient chip removal and consistent thread form
• High-speed steel construction provides durability across aluminum, magnesium, mild steel, and stainless steel
• Bright uncoated finish suitable for use with standard cutting fluids
• Compact overall length of 74.61 mm supports use in confined workspaces

Compatibility

Designed for use with HELI-COIL wire thread insert systems requiring an M8 x 1.25 STI tap. Compatible with aluminum, magnesium, mild steel, and stainless steel base materials as specified by the manufacturer.

Installation Notes

This tap is intended for use by trained machinists or maintenance technicians familiar with thread insert repair procedures. Secure the workpiece firmly before tapping and use an appropriate cutting fluid for the base material being threaded. Apply steady, even pressure and back off periodically to break chips, particularly in stainless steel or deep blind holes. Follow the insert manufacturer's bore preparation specifications for drill size and depth before tapping.