Osg 34200901 Spiral Point Sti Tap M12 X 1.75 3 Flute

Product Description

The OSG 34200901 is a spiral point STI tap designed for threading STI metric coarse holes to accept thread inserts. Built from vanadium high-speed steel with an oxide finish, this plug chamfer tap drives chips forward through the hole during cutting, making it well suited for through-hole tapping operations. It runs a 3-flute, D4 thread limit configuration in a 6H class of fit, delivering consistent thread tolerance on M12 x 1.75 metric coarse threads. Overall length is 3-13/16 inches with a thread length of 1-13/16 inches and a shank diameter of 0.4800 inches. Licensed machinists and maintenance technicians working in metalworking, repair, or manufacturing environments reach for this tap when installing helical thread inserts in ferrous and non-ferrous materials.

This tap is intended for use in applications requiring STI metric coarse thread preparation, specifically M12 x 1.75 sizing. The plug chamfer style makes it suitable for through-hole threading where the tap can advance freely past the bottom of the hole. It is commonly used in machine shops, MRO operations, and field repair contexts where thread insert installation is required to restore or reinforce threaded bores in metal components.

Key Features

• STI metric coarse thread standard for use with thread insert systems
• Vanadium high-speed steel construction for wear resistance in ferrous and non-ferrous materials
• Oxide finish for mild lubricity and corrosion resistance during storage and use
• Plug chamfer style optimized for through-hole tapping applications
• 3-flute spiral point design drives chips forward to clear the cutting zone
• D4 thread limit with 6H class of fit for consistent, controlled thread tolerance

Compatibility

Designed for STI metric coarse through-hole tapping applications requiring an M12 x 1.75 thread size in the OSG Series 342STI product line.

Installation Notes

This tap is installed by machinists or maintenance technicians using a standard tap handle, tapping machine, or CNC machine tool set to the appropriate speed and feed for the workpiece material. Always ensure the workpiece is secured and the tap is properly aligned before beginning the threading operation. Use appropriate cutting fluid to extend tool life and improve thread quality. Follow all applicable shop safety procedures and machine guarding requirements during operation.