Scientific Cutting Tools TM170-32A Thread Mill 1/4-32

Product Description

The SCIENTIFIC CUTTING TOOLS TM170-32A is a straight flute thread mill designed for cutting internal 1/4-32 UNEF threads in precision machining applications. Built from submicron-grade solid carbide, it delivers the rigidity and wear resistance needed for tight-tolerance thread forms. The tool features an AlTiN+ coating for improved heat resistance and tool life at higher cutting speeds. With a 0.17-inch cutting diameter, a 0.545-inch length of cut, and three straight flutes, it is suited for CNC machining centers where helical interpolation is used to generate the thread profile in a single pass or multiple passes depending on material hardness.

This thread mill is used in job shops, production machining, aerospace, and mechanical assembly environments where UNEF internal threads must be cut in ferrous and non-ferrous materials. The straight flute geometry performs well in through-hole and blind-hole applications. The 1/4-inch shank diameter fits standard collet chucks and end mill holders on CNC milling machines and machining centers. It is appropriate for machinists and CNC programmers working with small-diameter precision threads requiring consistent pitch accuracy across high-mix or high-volume work.

Key Features

• Straight flute design for internal 1/4-32 UNEF thread milling
• Submicron-grade solid carbide construction for wear resistance and rigidity
• AlTiN+ coating for elevated heat resistance and extended tool life
• Three flutes for balanced cutting action and chip evacuation
• 0.545-inch length of cut accommodates typical thread depth requirements for 1/4-32 applications
• No coolant-through design - suitable for external flood or mist coolant delivery

Compatibility

Designed for use on CNC milling machines and machining centers with helical interpolation capability, compatible with standard 1/4-inch collet chucks and end mill holders. Intended for cutting internal 1/4-32 UNEF threads with a minimum nominal hole diameter of 1/4 inch.

Installation Notes

Thread mills require a CNC control capable of helical interpolation (G02/G03 with Z-axis motion) - confirm program compatibility before setup. Secure the tool in a balanced, runout-minimized holder; excessive runout will degrade thread quality and shorten tool life. Power down and lock out the spindle before changing tooling in accordance with standard shop safety procedures. Follow machine manufacturer guidelines and applicable OSHA standards for rotating cutting tools.