Scientific Cutting Tools TMI234-18HA Thread Mill 5/16-18

Product Description

The SCIENTIFIC CUTTING TOOLS TMI234-18HA is a solid carbide helical flute thread mill designed for cutting internal 5/16-18 UNC threads in a single helical pass. Built from submicron-grade carbide and finished with an AlTiN+ coating, this tool handles ferrous and hard-to-machine materials with consistent tool life. The right-hand flute direction and 3-flute geometry balance chip evacuation with surface finish quality. With a cutting diameter of 0.2340 inches and a length of cut of 0.6320 inches, the TMI234-18HA suits applications where thread accuracy and repeatability matter. CNC machinists and tool-and-die professionals are the primary installers of this tool.

This thread mill is suited for internal threading operations on CNC machining centers in both production and job-shop environments. Its long-reach design extends access into deeper bores or recessed features where standard-length tools cannot reach. The 1/4-inch shank diameter fits standard collet and end mill holders. At 18 TPI and a 5/16-18 thread size, it targets common UNC fastener thread profiles used across general mechanical, structural, and industrial assemblies.

Key Features

• Solid submicron carbide construction for rigidity and extended tool life in hard materials
• AlTiN+ coating improves heat resistance and reduces friction at the cutting edge
• 3-flute helical geometry balances chip evacuation with thread surface finish
• Long-reach thread mill type allows threading of recessed or deep-bore features
• Right-hand flute direction compatible with standard CNC climb-milling thread routines
• No coolant-through design simplifies setup in standard collet and end mill toolholding

Compatibility

Designed for internal 5/16-18 UNC thread milling operations on CNC machining centers equipped with 1/4-inch collet or end mill holders.

Installation Notes

Installation and operation of this thread mill requires a CNC machining center with helical interpolation capability. The tool should be secured in a properly sized collet or end mill holder torqued to the toolholder manufacturer's specification. Confirm spindle speed and feed rate against the tool manufacturer's cutting data for the specific workpiece material before running. Inspect the cutting edges for wear or chipping after each production run.