Scientific Cutting Tools TMI620-9HA Thread Mill 7/8-9

Product Description

The SCIENTIFIC CUTTING TOOLS TMI620-9HA is a solid carbide helical flute thread mill designed for cutting internal UNC threads in a CNC machining environment. It produces 7/8-9 threads with a 9 teeth-per-inch pitch and a 0.620-inch cutting diameter. The long-reach configuration and 1.489-inch length of cut allow it to machine threads in deeper bores where standard-length tooling cannot reach. This tool carries an AlTiN+ coating for improved heat resistance and tool life at elevated cutting speeds. It is intended for use by machinists and tooling specialists working with CNC milling machines.

This thread mill is suited for production and job-shop environments requiring precise internal UNC thread generation without a traditional tap. The long-reach design accommodates deeper bores and provides clearance in confined part geometries. With a 5/8-inch shank diameter and 4.000-inch overall length, it fits standard CNC mill tool holders. Right-hand flute direction and a 4-flute configuration support consistent chip evacuation and thread form accuracy across a range of workpiece materials compatible with AlTiN+ coated submicron carbide tooling.

Key Features

• Cuts 7/8-9 UNC internal threads at 9 TPI with a 0.620-inch cutting diameter
• Long-reach thread mill type provides access to deeper bores and recessed features
• AlTiN+ coating improves thermal resistance and extends tool life in demanding cuts
• Submicron solid carbide grade delivers rigidity and edge stability
• 4-flute, right-hand helical configuration promotes efficient chip flow
• 5/8-inch shank diameter fits standard CNC milling tool holders

Compatibility

Designed as an OEM-style replacement or direct-use thread milling tool for CNC machining centers requiring 7/8-9 UNC internal thread generation with a 5/8-inch shank interface.

Installation Notes

Installation and operation of this thread mill should be performed by qualified CNC machinists familiar with helical interpolation thread milling routines. Secure the shank in a properly sized collet or end mill holder and verify runout before use. Coolant-through is not supported on this tool, so ensure adequate external coolant or air blast is applied at the cutting zone. Follow all machine guarding and tool-change lockout procedures before handling or setting the tool.