Guhring 9057170200000 Spiral Flute Tap M20 X 2.50 Cobalt

Product Description

The GUHRING 9057170200000 is a spiral flute tap designed for metric blind hole threading in demanding industrial and machining applications. Built from cobalt high-speed steel and finished with an oxide coating, this tap handles a wide range of ferrous and non-ferrous workpiece materials. It cuts an M20 x 2.50 thread to a 6H class of fit with a D7 thread limit, delivering consistent dimensional accuracy. The modified bottoming chamfer allows threading close to the bottom of blind holes. With a 40-degree helix angle and fast flute style, chip evacuation is efficient even in deep blind bore conditions. Licensed machinists, tool-and-die makers, and CNC operators are the typical end users.

This tap is suited for production and maintenance machining environments where metric blind hole threading is required. The 40-degree spiral flute geometry promotes upward chip flow, making it well matched to blind hole applications in materials including alloy steel, alloy tool steel, aluminum alloy, case hardened steel, cast iron, ductile iron, free cutting steel, heat treated steel, malleable cast iron, stainless steel, structural steel, and tool steel. Series 5717 from GUHRING targets general-purpose and high-production tapping where tool life and thread quality are priorities.

Key Features

• M20 x 2.50 metric thread, 6H class of fit, D7 thread limit for tight dimensional control
• Cobalt HSS construction provides elevated heat and wear resistance in tough materials
• 40-degree helix angle with fast flute style for reliable upward chip evacuation in blind holes
• Modified bottoming chamfer allows threading near the bottom of blind bores
• Oxide finish reduces friction and provides light corrosion resistance during storage and use
• Right hand flute and right hand thread; no coolant-through feature required for standard setups

Compatibility

Designed for blind hole threading applications requiring an M20 x 2.50 metric thread in the material types listed above. Confirm shank and machine spindle compatibility before installation; shank diameter is 0.6299 inches (16.00 mm) with a 12.00 mm square drive size.

Installation Notes

This tap should be installed by qualified machinists or tooling technicians familiar with tapping feeds, speeds, and workholding practices. Secure the tap in a properly sized tap holder or CNC rigid tapping chuck matched to the 16.00 mm shank before operation. Always verify correct spindle rotation direction and programmed feed rate matches the 2.50 mm pitch before engaging the cut. Use an appropriate cutting fluid or tapping compound for the workpiece material to maximize tool life and thread quality.