Scientific Cutting Tools TMLR186-32A Thread Mill 1/4-32

Product Description

The SCIENTIFIC CUTTING TOOLS TMLR186-32A is a helical flute thread mill designed for cutting internal 1/4-32 UNEF threads in precision machining applications. Built from submicron-grade solid carbide and coated with AlTiN+, this long-reach tool delivers consistent thread quality in hardened and abrasive materials. It features 3 right-hand flutes, a 0.1860 inch cutting diameter, and a 1/2 inch length of cut. Machinists and CNC operators install this tool in milling centers where single-point threading or tapping is impractical or where thread quality and tool life are the priority.

This thread mill is suited for internal threading operations in precision components found in aerospace, defense, instrumentation, and industrial manufacturing environments. The long-reach design allows access to thread features in recessed bores or deeper pockets. With a 1/4 inch shank diameter and 2-1/2 inch overall length, it fits standard ER and end mill collet systems. No coolant-through capability means it is intended for use with external coolant or dry cutting strategies appropriate to the workpiece material.

Key Features

• Cuts internal 1/4-32 UNEF threads with a single helical interpolation pass
• Submicron-grade solid carbide construction for rigidity and wear resistance
• AlTiN+ coating extends tool life in hardened, stainless, and abrasive materials
• 3 right-hand helical flutes for efficient chip evacuation
• Long-reach thread mill type for access to recessed or deep-pocket features
• 0.1860 inch cutting diameter with 1/2 inch length of cut

Compatibility

Designed for use in CNC machining centers capable of helical interpolation; fits standard 1/4 inch shank collet systems and is suited for internal UNEF 1/4-32 thread milling operations.

Installation Notes

Installation and operation should be performed by qualified machinists or CNC programmers familiar with thread milling cycles. Secure the shank in a properly sized collet or end mill holder and verify runout before cutting. Program the correct helical interpolation path for the specified thread pitch and diameter. Inspect the tool and holder for wear or contamination before each use, and ensure the machine spindle is stopped completely before any tool changes.