Hertel K027749AS M8x1.25 Straight Flute Tap 6H Hss

Product Description

The HERTEL K027749AS is a straight flute tap designed for cutting M8x1.25 metric coarse internal threads in a wide range of materials. Built from high-speed steel with a bright uncoated finish, this tap delivers consistent thread form in moderate-production and maintenance environments. It features a plug chamfer for general-purpose through-hole and blind-hole tapping, a 6H class of fit for standard metric thread tolerances, and a D5 thread limit. Overall length is 2-23/32 inches. Four flutes provide adequate chip clearance and stability during hand or machine tapping operations.

This tap is suited for metalworking, maintenance, repair, and light manufacturing applications where M8x1.25 metric coarse threads are required. It is commonly used in machine shops, toolrooms, and field repair settings. The plug chamfer style makes it appropriate for starting threads in through holes or partially threading blind holes. Machinists, millwrights, and maintenance technicians working with steel, aluminum, cast iron, and similar materials typically reach for this style of tap.

Key Features

• M8x1.25 metric coarse thread form for standard metric fastener compatibility
• 4-flute straight design provides stability and chip control in short-chipping materials
• Plug chamfer for versatile use in through-hole and blind-hole applications
• 6H class of fit meets standard metric thread tolerance requirements
• D5 thread limit for controlled tap-to-thread fit
• High-speed steel construction for durability across a range of workpiece materials
• Bright uncoated finish - no coating buildup to affect thread sizing

Compatibility

Designed as a standard OEM-style straight flute tap for use with M8x1.25 metric coarse threading applications in machine and hand tapping setups.

Installation Notes

This tap should be installed in a tap wrench, tapping head, or CNC tapping holder rated for the appropriate torque range for M8 threads. Always secure the workpiece firmly and use appropriate cutting fluid for the material being tapped. Back the tap out periodically to break and clear chips, especially in blind-hole applications. Follow applicable shop safety practices and ensure the tap is properly aligned to avoid tap breakage or cross-threading.