Tool-flo 603655LAC3R Threading Insert Carbide Flo-lock

Product Description

The TOOL-FLO 603655LAC3R is a carbide threading insert designed for precision thread cutting in metalworking applications. Built to the FLT3L insert style with an AC3R manufacturer grade and PVD coating, this insert handles both internal and external threading at 5-12 TPI internal and 6-20 TPI external ranges. The 60-degree V-thread form conforms to standard unified thread profiles. Left-hand orientation makes it suited for reverse-thread applications. Machinists and tool-and-die professionals install this insert into compatible Flo-Lock series toolholders on CNC lathes and manual threading setups.

This insert fits residential and industrial machine shop environments where precision threading is required on external and internal workpiece features. The Flo-Lock series designation indicates compatibility with TOOL-FLO Flo-Lock series toolholding systems. It is appropriate for threading operations on steel, stainless, and similar machinable metals where a coated carbide grade provides wear resistance and extended tool life. The left-hand configuration is used when thread direction or spindle rotation requires reverse cutting orientation.

Key Features

• Carbide substrate with PVD coating for wear resistance and extended service life
• Handles both internal threading at 5-12 TPI and external threading at 6-20 TPI
• 60-degree V-thread included angle for standard unified thread form compatibility
• Left-hand insert orientation for reverse-thread cutting applications
• Insert size 3 with a thickness of 0.195 inches and tip-to-top dimension of 0.098 inches
• Minimum corner radius of 0.005 inches and maximum corner radius of 0.008 inches for controlled thread root profile

Compatibility

Designed for use with TOOL-FLO Flo-Lock series threading toolholders that accept FLT3L style inserts.

Installation Notes

Installation is performed by machinists or tooling technicians following standard CNC or manual lathe tooling change procedures. The machine spindle must be fully stopped and all energy sources locked out before seating or removing the insert. Use the appropriate torx or hex key specified by the toolholder manufacturer to secure the insert clamp to the correct seating torque. Inspect the insert pocket for chips or debris before installation to ensure proper seating and avoid premature insert failure.