Scientific Cutting Tools TM235-40A Thread Mill 5/16-40

Product Description

The SCIENTIFIC CUTTING TOOLS TM235-40A is a straight flute thread mill designed for cutting internal 5/16-40 UNS threads in a CNC machining environment. Built from submicron-grade solid carbide and finished with an AlTiN+ coating, this tool delivers consistent thread geometry and extended tool life in ferrous and nonferrous materials. It features 3 flutes, a 0.235-inch cutting diameter, and a 1/4-inch shank diameter. With an overall length of 2.5 inches and a 0.66-inch length of cut, the TM235-40A suits tight-tolerance thread milling operations where tap breakage and chip evacuation are primary concerns for machinists and toolroom technicians.

This thread mill is suited for use on CNC machining centers with helical interpolation capability. It is intended for internal thread applications at 40 teeth per inch, with a minimum nominal diameter of 5/16 inch. Typical applications include production machining of threaded holes in aerospace, automotive, and general industrial components where solid carbide tooling is specified for hard or abrasive workpiece materials. No coolant-through capability means external coolant or mist lubrication should be applied at the cutting zone during operation.

Key Features

• Straight flute geometry for internal 5/16-40 UNS thread milling
• Submicron-grade solid carbide substrate for rigidity and wear resistance
• AlTiN+ coating for elevated-temperature performance and extended tool life
• 3 flutes provide a balance of chip clearance and cutting edge support
• 1/4-inch shank diameter compatible with standard ER and precision collet toolholders
• No coolant-through design simplifies toolholder selection

Compatibility

Designed as a straight flute thread mill for internal 5/16-40 UNS threaded holes, compatible with CNC machining centers equipped with helical interpolation and standard 1/4-inch collet or end mill toolholders.

Installation Notes

Installation and operation should be performed by a qualified CNC machinist or toolroom technician. Secure the 1/4-inch shank in a precision collet or shrink-fit toolholder to minimize runout before thread milling. Program the machining center for helical interpolation at the correct thread pitch before initiating the cut. Apply appropriate external coolant or mist lubrication at the cutting zone, as this tool does not include coolant-through passages.