Scientific Cutting Tools Tm 620-12 Thread Mill 7/8-12

Product Description

The SCIENTIFIC CUTTING TOOLS TM 620-12 is a straight flute thread mill designed for cutting internal UNS threads at 7/8-12 (12 teeth per inch). Built from submicron-grade solid carbide with a bright finish, it delivers precise thread forms in ferrous and non-ferrous materials where tapping is impractical or where a single tool must cover a range of thread depths. With 6 flutes and a 0.62-inch cutting diameter, this tool produces clean, accurate internal threads in a milling environment. CNC machinists and tool-and-die professionals rely on it for production and prototype applications requiring tight tolerances.

This thread mill is suited for use on CNC machining centers capable of helical interpolation. It is intended for internal thread milling in materials where solid carbide tooling is the standard choice, including alloy steels, stainless steels, aluminum, and engineering plastics. The 5/8-inch shank diameter makes it compatible with standard ER and hydraulic collet chucks. It is a direct fit for shops requiring a 7/8-12 UNS internal thread profile without the breakage risk associated with solid taps in difficult materials.

Key Features

• Straight flute geometry with 6 flutes for stable, chatter-resistant thread milling
• Submicron-grade solid carbide construction for wear resistance and dimensional consistency
• Bright (uncoated) finish suitable for a wide range of work materials
• 12 TPI UNS internal thread profile, 7/8-inch nominal diameter
• No coolant-through design - external flood or mist coolant recommended
• 3.5-inch overall length provides clearance for most standard fixturing setups

Compatibility

Designed for internal UNS thread milling at 7/8-12 on CNC machining centers with helical interpolation capability. Fits standard 5/8-inch collet and hydraulic chuck toolholders.

Installation Notes

Thread mills require a CNC control programmed for helical interpolation - confirm machine capability before setup. Secure the shank fully in the collet or chuck to the recommended grip length and verify runout before cutting. Use appropriate feeds, speeds, and cutting depth per the tool manufacturer recommendations for the work material. Always power down the spindle and confirm the tool is stationary before making any adjustments or measurements.