Scientific Cutting Tools SPTM182ML Thread Mill 18-56 Tpi

Product Description

The SCIENTIFIC CUTTING TOOLS SPTM182ML is a single profile thread mill designed for cutting internal and external threads across a range of 18 to 56 TPI, covering thread sizes from 1/4-18 to 1/4-56. Constructed from submicron-grade solid carbide with a bright, uncoated finish, this tool delivers consistent thread geometry in a single-pass or multi-pass CNC milling operation. The 4-flute design provides efficient chip evacuation and stable cutting action. With a 0.182-inch cutting diameter, a 1/4-inch shank, and a 2.5-inch overall length, this mill is suited for precision threading work where a dedicated tap is impractical or where thread diameter and pitch flexibility is required.

This thread mill is used in CNC machining centers for generating unified and fine-pitch threads in a wide variety of materials. The compact cutting diameter and extended neck geometry make it well suited for threading operations in tight-clearance bores or where multi-pitch capability on a single tool reduces tooling inventory. It is typically deployed in job shops, aerospace, and general metalworking environments where machinists require a single tool to handle a broad TPI range on both internal bores and external thread forms.

Key Features

• Covers 18 to 56 TPI in a single tool, eliminating the need for multiple tap sizes across that range
• Cuts both internal and external thread forms
• Submicron-grade solid carbide construction for wear resistance and dimensional stability
• 4-flute geometry for efficient chip evacuation during thread milling cycles
• Bright, uncoated finish suitable for a wide range of workpiece materials
• Narrow neck diameter of 0.104 inches allows access in restricted-clearance applications

Compatibility

Designed for use in CNC machining centers with standard 1/4-inch collet or end mill toolholders. Suitable for threading operations ranging from 1/4-18 to 1/4-56 thread sizes in both internal and external configurations.

Installation Notes

Thread mills are installed and operated by trained CNC machinists and toolroom technicians. Confirm proper toolholder runout and collet clamping before beginning a thread milling cycle, as excessive runout directly affects thread accuracy. Program the helical interpolation path to match the target thread pitch and direction before cutting. Do not use this tool in manual machining operations; CNC control is required for accurate helical thread interpolation.