Hertel K027718AS25 M2.5x0.45 Bottoming Tap 6H Hss Tin

Product Description

The HERTEL K027718AS25 is a straight flute bottoming tap designed for cutting M2.5x0.45 Metric Coarse internal threads in blind holes. Built from high-speed steel with a titanium nitride coating, it delivers extended tool life and reduced friction in ferrous and non-ferrous materials. The bottoming chamfer style allows threading close to the bottom of a blind bore, making it the correct choice when full thread depth near the base is required. With 3 flutes and a 6H class of fit, this tap produces precise, standard-tolerance metric threads suitable for fastener assembly and precision machining applications.

This tap is used in production machining, toolroom work, and maintenance repair operations where M2.5 metric threads are required in blind holes. The right-hand thread direction is standard for conventional tapping setups on drill presses, CNC machining centers, or tapping fixtures. It suits applications in light industrial assembly, instrument manufacturing, and component fabrication where small-diameter metric threads are common.

Key Features

• Bottoming chamfer for threading to near full depth in blind holes
• High-speed steel construction for durability across a range of work materials
• Titanium nitride coating reduces friction and extends tool life
• 6H class of fit produces standard-tolerance threads compatible with 6g fasteners
• D3 thread limit for consistent thread geometry
• 3-flute straight flute design for chip control in through and blind hole tapping

Compatibility

Designed as an OEM-style cutting tool replacement for applications requiring M2.5x0.45 Metric Coarse bottoming taps with a 6H class of fit in standard tapping chucks and holders accepting a 0.141 inch shank diameter.

Installation Notes

This tap should be installed by a qualified machinist or toolroom technician using a properly sized tap wrench, tapping fixture, or CNC tapping cycle. Ensure the workpiece is securely fixtured and the pilot hole diameter is correct for M2.5x0.45 before beginning the tapping operation. Use appropriate cutting fluid for the work material to prevent galling and premature wear. Never force a bottoming tap into an unprepared or undersized hole.