Scientific Cutting Tools Tm 620-14 Thread Mill 7/8-14

Product Description

The SCIENTIFIC CUTTING TOOLS TM 620-14 is a straight flute thread mill designed for cutting internal 7/8-14 UNF threads in a single helical pass. Built from submicron-grade solid carbide, it delivers the rigidity and wear resistance required for precision threading in hardened materials and high-production environments. The tool features 6 flutes with a bright finish and runs without coolant-through capability, making setup straightforward on standard CNC machining centers. With a 0.62-inch cutting diameter and 1.035-inch length of cut, it handles the full thread depth for 7/8-14 applications in one interpolation cycle.

This thread mill is suited for CNC milling operations in job shops, production facilities, and aerospace or industrial machining environments where UNF internal threads are required. It is installed and operated by machinists and CNC programmers working on mills or machining centers capable of circular interpolation. The 5/8-inch shank diameter fits standard ER and CAT tooling systems commonly found in vertical and horizontal machining centers. Its straight flute geometry makes it a reliable choice for through-hole and blind-hole internal threading on a range of ferrous and non-ferrous workpiece materials.

Key Features

• Cuts 7/8-14 UNF internal threads with 14 teeth per inch
• Submicron-grade solid carbide construction for extended tool life in demanding materials
• 6 straight flutes provide stable cutting action and consistent thread form
• Bright finish with no coating reduces built-up edge in non-ferrous applications
• 0.62-inch cutting diameter and 1.035-inch length of cut cover full thread engagement depth
• 3.5-inch overall length compatible with standard CNC tool holders and machining center setups

Compatibility

Designed as an OEM-style thread milling tool for CNC machining centers capable of circular interpolation and equipped with a 5/8-inch shank toolholder; suitable for producing 7/8-14 UNF internal threads in ferrous and non-ferrous materials.

Installation Notes

Installation and operation should be performed by a qualified machinist or CNC programmer. Secure the shank in a properly sized collet or milling chuck and verify runout before cutting. Program the tool path using circular interpolation with the correct helical pitch for the 14 TPI thread form. Inspect the tool for chipping or wear before each use and replace if cutting edge integrity is compromised.