Guhring 9041210200070 Spiral Flute Tap M20 X 1.50

Product Description

The GUHRING 9041210200070 is a spiral flute tap designed for metric fine threading in blind hole applications. It cuts an M20 x 1.50 thread to a 6H class of fit and is constructed from powdered metal with a TiN (titanium nitride) coating for extended tool life in demanding materials. The 40-degree helix angle promotes efficient chip evacuation in blind holes, reducing the risk of chip packing. This tap is suited for machinists and tool-and-die professionals working with high-tensile steel in production or job shop environments. It measures 4.921 inches overall and features a right-hand flute with right-hand thread direction.

This tap is rated for blind hole threading in high-tensile steel, making it appropriate for aerospace, automotive, and general industrial machining where tight thread tolerance and material hardness demand a premium cutting geometry. The modified bottoming chamfer allows threading close to the bottom of a blind hole. The fast flute style supports higher feed rates in controlled CNC and manual tapping operations. The D6/D7 thread limit designation indicates the tap's oversize grind relative to nominal thread geometry, which accounts for material springback in tougher workpieces.

Key Features

• M20 x 1.50 metric fine thread, 6H class of fit with D6/D7 thread limit
• 40-degree helix angle for efficient chip evacuation in blind holes
• Powdered metal construction with TiN coating for wear resistance in high-tensile steel
• Modified bottoming chamfer for threading close to blind hole floors
• 4 flutes, right-hand thread and flute direction, fast flute style
• Series 4121 tap — no coolant-through feature

Compatibility

Designed for blind hole threading in high-tensile steel workpieces requiring an M20 x 1.50 metric fine thread at a 6H class of fit. Suitable for use in CNC machining centers and manual tapping fixtures accepting standard straight-shank taps with a 0.652-inch shank diameter.

Installation Notes

This tap should be installed by a qualified machinist familiar with metric threading standards and blind hole procedures. Ensure the workpiece is securely fixtured and the tapping spindle is properly aligned before operation. Use an appropriate tapping fluid or cutting oil rated for high-tensile steel to protect the tool edge and maintain thread quality. Do not reverse the tap without adequate chip clearance to avoid breakage in blind holes.