Sandvik Coromant 6635020 Spiral Point Tap 1/8-28 G Hss

Product Description

The SANDVIK COROMANT 6635020 is a spiral point tap designed for cutting internal threads in a range of ferrous metals. Part of the CoroTap 200 series, it cuts a 1/8-28 G thread profile with a plug chamfer, allowing the tap to start easily and drive chips forward through the hole during through-hole tapping operations. The tap is manufactured from high-speed steel and features 3 flutes with a right-hand thread direction. Overall length is 3.7 inches (94 mm) and thread length is 0.71 inches (18 mm). The shank diameter is 0.276 inches (7 mm). Weight is 0.25 pounds.

This tap is suited for through-hole threading applications in materials including cast iron, stainless steel, and carbon steel. The spiral point geometry pushes chips ahead of the tap rather than packing them in the flutes, making it well-suited for production environments where clean chip evacuation and consistent thread quality are priorities. Typical applications include fabrication, maintenance, and repair work where 1/8-28 G parallel pipe or port threads are required. A licensed machinist or skilled tradesperson would install or use this tap with a tap wrench, drill press, or CNC tapping setup.

Key Features

• 1/8-28 G thread form with plug chamfer for easy starting in through-hole applications
• Spiral point geometry drives chips forward, reducing packing and tap breakage risk
• High-speed steel construction for durability across cast iron, stainless steel, and steel workpieces
• 3-flute design balances chip room and thread contact for consistent thread quality
• Right-hand thread direction, standard for G-series parallel pipe and port threads
• Part of the CoroTap 200 series for repeatable performance in production environments

Compatibility

Designed for through-hole tapping of 1/8-28 G threads in cast iron, stainless steel, and steel. Compatible with standard tap holders and collet chucks accepting a 0.276-inch (7 mm) shank diameter. Part of the SANDVIK COROMANT CoroTap 200 series.

Installation Notes

This tap should be installed in a properly sized tap holder or collet chuck matched to the 7 mm shank diameter. Ensure the workpiece is securely fixtured and that the pilot hole is drilled to the correct tap drill size for a 1/8-28 G thread before tapping. Use an appropriate cutting fluid for the workpiece material, particularly when tapping stainless steel. Inspect the tap for wear or chipping before each use and replace if thread quality degrades.