Hertel K010455AS25 Thread Forming Tap M5x0.8 Bottoming Hss Tin

Product Description

The HERTEL K010455AS25 is a metric bottoming thread forming tap manufactured from high-speed steel with a titanium nitride (TiN) coating. Unlike cutting taps, thread forming taps cold-form the thread profile by displacing material rather than cutting it, producing stronger threads with no chips to clear. This tap is sized for M5x0.8 metric threads and measures 2.375 inches overall length with a thread length of 0.875 inches. The TiN coating increases surface hardness and reduces friction during forming. It is used by machinists, tool-and-die makers, and maintenance technicians working on blind hole threading applications where chip evacuation would otherwise be a concern.

This tap is intended for blind hole threading in metric M5x0.8 applications. The bottoming chamfer with 1 to 2 chamfered threads allows threads to be formed close to the bottom of a blind hole, making it well suited for precision machined components, fixture work, and production environments where full thread depth is required. The right-hand thread direction matches standard metric fastener orientation. A D7 thread limit designates the tolerance class for the formed thread, appropriate for standard metric fit requirements.

Key Features

• Thread forming design displaces material rather than cutting, eliminating chips in blind holes
• Bottoming chamfer with 1 to 2 chamfered threads for threading close to the bottom of blind holes
• High-speed steel construction provides toughness and wear resistance across a range of workpiece materials
• Titanium nitride coating reduces friction and extends tap service life
• D7 thread limit for standard metric tolerance fit
• Right-hand thread direction, compatible with standard metric fastener orientation

Compatibility

Designed for blind hole threading applications requiring M5x0.8 metric right-hand threads with a D7 thread limit tolerance class.

Installation Notes

Thread forming taps require a properly sized forming tap drill hole, which is larger than a standard cutting tap drill size for the same thread — consult a thread forming drill chart for the correct hole diameter before use. Secure the workpiece and use a calibrated tap handle or machine spindle aligned to the hole axis to avoid tap breakage. Apply appropriate tapping fluid or cutting oil for the workpiece material. Power down and de-energize any machine tool before changing or installing tooling.