Sandvik Coromant 6539460 Spiral Flute Tap M8x1.25 Metric

Product Description

The SANDVIK COROMANT 6539460 is a spiral flute tap designed for cutting M8x1.25 metric internal threads in a wide range of workpiece materials. Part of the CoroTap 300 series, it features a 45-degree helix angle and a fast flute style that efficiently evacuates chips up and out of the hole during through-hole and shallow blind-hole tapping operations. The modified bottoming chamfer allows threading close to the bottom of a blind hole while maintaining thread quality. With a powdered metal construction and oxide coating, this tap delivers solid wear resistance in production environments. Licensed machinists and CNC operators will recognize it as a reliable choice for metric threading applications requiring a 6H class of fit.

This tap is suited for use in machining centers, CNC mills, and manual tapping setups where M8x1.25 metric threads are required. The right-hand spiral flute geometry promotes chip flow away from the cutting zone, making it appropriate for materials that produce long, stringy chips. The modified bottoming chamfer allows threading in tight blind-hole scenarios where a standard taper or plug chamfer would leave too many unformed threads at the base. It is used in job shops, tool rooms, and production floor environments across metal fabrication, automotive, and general mechanical assembly operations.

Key Features

• M8x1.25 metric thread size with 6H class of fit for standard tolerance threading
• 45-degree helix angle with fast flute style for efficient chip evacuation
• Modified bottoming chamfer for threading close to the bottom of blind holes
• Powdered metal construction provides enhanced wear resistance over standard HSS
• Oxide coating reduces friction and improves tool life in ferrous materials
• CoroTap 300 series design for consistent thread quality in CNC and manual applications

Compatibility

Designed as an OEM-style replacement tap for M8x1.25 metric threading applications requiring a 6H class of fit in the CoroTap 300 series product line.

Installation Notes

This tap should be installed by qualified machinists familiar with tapping operations and proper speeds and feeds for the workpiece material. Ensure the spindle and workpiece are properly secured before beginning any tapping cycle, and confirm the correct tap drill diameter has been used to prepare the hole per M8x1.25 metric specifications. Apply appropriate cutting fluid or tapping compound for the material being threaded. Do not exceed recommended spindle speeds for the tap size, and inspect the tool regularly for wear or chipping to avoid thread damage or tap breakage.