Scientific Cutting Tools SPTM080L Thread Mill 40-64 Tpi

Product Description

The SCIENTIFIC CUTTING TOOLS SPTM080L is a single profile thread mill designed to cut both internal and external threads in the 40 to 64 TPI range, covering No. 4-40 through No. 4-64 thread sizes. Ground from submicron-grade solid carbide, it features 3 flutes, a 0.08 inch cutting diameter, and a bright uncoated finish. The 3/16 inch shank diameter and 2 inch overall length make it well-suited for small-diameter threading operations on CNC machining centers. Machinists and toolroom professionals use this tool where a single cutter needs to cover a range of fine-pitch thread specifications without a tool change.

This thread mill is used in precision machining environments including job shops, aerospace component production, medical device manufacturing, and general metalworking where fine-pitch threads in small bores are required. The single profile design allows helical interpolation on a CNC mill to produce a range of thread sizes within its TPI range, reducing tooling inventory. Both internal threading in blind and through holes and external thread milling on bosses and studs are within its application scope.

Key Features

• Covers No. 4-40 through No. 4-64 thread forms in a single tool, reducing setups
• Submicron-grade solid carbide blank for rigidity and edge retention in fine-pitch work
• 3-flute geometry balances chip evacuation with surface finish at small diameters
• Bright uncoated finish suited for aluminum, brass, and other non-ferrous materials
• 0.045 inch neck diameter and 0.30 inch neck length allow reach into shallow bores without shank interference
• 0.30 inch length of cut accommodates typical thread engagement depths for No. 4 fasteners

Compatibility

Designed for use on CNC machining centers capable of helical interpolation; compatible with standard 3/16 inch diameter collet chucks and end mill holders. Thread range covers No. 4-40 to No. 4-64 internal and external thread forms.

Installation Notes

Thread milling requires a CNC control with helical interpolation capability and proper thread mill programming - consult the machine tool builder documentation and cutting tool manufacturer feeds-and-speeds data before use. Secure the shank fully in a rigid collet or shrink-fit holder to minimize runout at this small diameter. Verify workpiece fixturing is rigid, as deflection at 0.08 inch cutting diameters can produce out-of-tolerance threads or cause tool breakage. Handle submicron carbide tooling carefully to avoid chipping the cutting edges during setup.