Scientific Cutting Tools TM345-20A Thread Mill 7/16-20

Product Description

The SCIENTIFIC CUTTING TOOLS TM345-20A is a straight flute thread mill designed for cutting internal UNF threads in a CNC machining environment. Built from submicron-grade solid carbide and finished with an AlTiN+ coating, it handles the thermal and abrasive demands of threading operations in ferrous and non-ferrous materials. It carries 4 flutes, a 0.345-inch cutting diameter, and a 0.375-inch shank diameter. With 20 teeth per inch and a length of cut of 0.821 inches, it is suited for producing 7/16-20 internal threads in a single helical interpolation pass. Machinists and CNC operators in job shops, aerospace, and general manufacturing environments are the primary installers.

This thread mill is used in applications requiring precise internal 7/16-20 UNF thread forms. Its straight flute geometry makes it appropriate for through-hole and blind-hole threading where chip evacuation is managed by coolant or air blast. The 3.5-inch overall length provides adequate reach for standard workpiece depths without excessive overhang. It is a solid carbide tool intended for use in rigid CNC machining centers where controlled helical interpolation is available. No coolant-through capability is present, so external coolant or air blast is recommended during operation.

Key Features

• Submicron-grade solid carbide construction for wear resistance and dimensional stability
• AlTiN+ coating improves heat resistance and extends tool life in abrasive materials
• 4 straight flutes with 20 TPI for 7/16-20 UNF internal thread form
• 0.821-inch length of cut accommodates typical thread engagement depths for this thread size
• 3/8-inch shank diameter fits standard ER collet chucks and milling tool holders
• No staggered tooth geometry - consistent chip load across all flutes

Compatibility

Designed as an OEM-style thread milling tool for CNC machining centers capable of helical interpolation, producing 7/16-20 UNF internal threads with a 3/8-inch shank tool holder.

Installation Notes

Installation and operation of this tool should be performed by a qualified CNC machinist or tooling technician. Secure the 3/8-inch shank in a properly torqued collet chuck or end mill holder before spindle operation. Confirm the CNC program uses helical interpolation appropriate for the 0.345-inch cutting diameter before running the cycle. Because this tool has no coolant-through capability, direct external coolant or air blast at the cutting zone to manage chip evacuation and heat buildup.