Hertel K007254AS Hand Sti Tap M3 X 0.5 Metric Coarse

Product Description

The HERTEL K007254AS is a hand STI tap designed for cutting M3 x 0.5 metric coarse internal threads in steel, aluminum, cast iron, and similar materials. STI taps cut threads to Screw Thread Insert (STI) specifications, producing an oversized thread form that accepts helical coil inserts for thread repair or reinforcement. This tap features a bottoming chamfer for threading close to the bottom of blind holes. Manufactured from high-speed steel (HSS) with a bright, uncoated finish, it measures 2 inches in overall length and carries a D1 thread limit. It is used by machinists, maintenance technicians, and tool-and-die professionals.

This tap is suited for repair work and production applications where a standard M3 thread has been damaged or where a stronger thread insert is required. The bottoming chamfer allows full thread engagement close to the bottom of a blind hole, making it appropriate for tight-tolerance fixtures, threaded inserts in thin materials, and component repair in aerospace, automotive, and general industrial settings. The 3-flute design provides adequate chip clearance for most short-chipping materials at this thread size.

Key Features

• STI thread form for use with helical coil thread inserts in M3 x 0.5 metric coarse applications
• Bottoming chamfer allows threading to the base of blind holes
• High-speed steel construction provides wear resistance across a range of workpiece materials
• Bright, uncoated finish suitable for general-purpose tapping with standard cutting fluids
• D1 thread limit for close tolerance thread production
• 3-flute design promotes chip evacuation in short-chipping materials

Compatibility

Designed for use with M3 x 0.5 metric coarse STI thread repair inserts. Intended for use in standard hand tapping operations or low-speed machine tapping setups where an STI oversize thread profile is required.

Installation Notes

This tap is installed by hand or with a tap wrench; ensure the workpiece is securely fixtured before beginning. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Follow the STI tap drill chart for the correct drill diameter prior to tapping, as STI taps require a larger pilot hole than standard taps of the same nominal thread size. Reverse the tap periodically to break chips and prevent binding in blind holes.