Scientific Cutting Tools TM395-20N Thread Mill 1/2-20 Unf

Product Description

The SCIENTIFIC CUTTING TOOLS TM395-20N is a straight flute thread mill designed for cutting 1/2-20 UNF threads on both external and internal features in a single tool path. Built from powdered metal and finished with a TiCN coating, it delivers consistent thread geometry and extended tool life in ferrous and non-ferrous materials. The tool runs 4 flutes with a 0.395-inch cutting diameter and an 0.87-inch length of cut, making it suitable for threading operations on CNC machining centers where helical interpolation is used. Machinists and tool-and-die tradespeople rely on thread mills like this one to produce accurate threads without the risk of tap breakage.

This thread mill is suited for job shops, production machining environments, and maintenance shops requiring precise UNF thread production. It handles both external boss threads and internal threaded holes of 1/2-20 UNF specification, eliminating the need for separate tools for each thread type. The 4-inch overall length provides adequate reach for most standard workpiece setups on vertical or horizontal CNC machining centers.

Key Features

• Cuts 1/2-20 UNF threads on both external and internal features with one tool
• TiCN coating improves wear resistance and extends tool life compared to uncoated carbide
• Powdered metal construction provides uniform hardness and edge retention
• 4-flute straight flute geometry suits helical interpolation thread milling on CNC equipment
• 0.395-inch cutting diameter with 0.87-inch length of cut accommodates standard thread depth requirements
• No coolant-through design - compatible with flood or mist external coolant delivery

Compatibility

Designed for use in CNC machining centers capable of helical interpolation, producing 1/2-20 UNF threads in both external and internal applications with a minimum nominal diameter of 1/2 inch.

Installation Notes

Thread mills require a CNC control capable of helical interpolation programming - confirm control compatibility before use. Secure the 1/2-inch straight shank in a collet chuck or end mill holder with appropriate runout tolerance to maintain thread accuracy. Set spindle speed and feed rate per the manufacturer recommendation for the workpiece material and coating type. Inspect the cutting edges before each use and replace the tool at first signs of edge wear to avoid thread-form deviation.