Scientific Cutting Tools TM250-32A Thread Mill 3/8-32

Product Description

The SCIENTIFIC CUTTING TOOLS TM250-32A is a straight flute thread mill designed to cut 3/8-32 UNEF threads in both external and internal applications. Built from submicron-grade solid carbide and coated with TiN for extended tool life, this mill features 4 staggered teeth and a cutting diameter of 1/4 inch. It is intended for use in CNC machining centers where precise thread form and repeatability are critical. Machinists and tooling specialists working in aerospace, automotive, medical, or general precision manufacturing will find this tool suited to demanding thread milling operations in hard and abrasive materials.

This thread mill is used in applications requiring 3/8-32 UNEF thread profiles on both external features such as bosses and internal features such as threaded bores. With a 1/4 inch shank diameter and an overall length of 2.5 inches, it fits standard CNC tool holders and is well-suited for both through-hole and blind-hole threading in production and job shop environments. The 4-flute straight configuration provides stable cutting geometry across a range of workpiece materials.

Key Features

• Cuts 3/8-32 UNEF threads at 32 teeth per inch, external and internal
• Submicron-grade solid carbide substrate for hardness and wear resistance
• TiN coating extends tool life and reduces friction in metallic workpieces
• Staggered tooth design for improved chip evacuation and surface finish
• 1/4 inch shank diameter fits standard CNC collet and end mill holders
• No coolant-through design - suitable for flood or mist coolant delivery

Compatibility

Designed as an OEM-style thread milling tool for CNC machining centers capable of helical interpolation and requiring 3/8-32 UNEF external or internal thread profiles.

Installation Notes

Thread mills of this type are installed and operated by machinists or CNC tooling technicians on three-axis or multi-axis CNC machining centers. Ensure the tool is seated fully and secured in a collet or tool holder rated for the 1/4 inch shank diameter before starting the spindle. Program helical interpolation at the correct pitch for 32 TPI to achieve accurate thread form. Verify workpiece is clamped securely and spindle speed and feed rate are appropriate for the workpiece material before engaging the cut.