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The TOOL-FLO 613600RN4C is a carbide threading insert designed for both internal and external thread cutting operations. Built to the FLTK style in the Flo-Lock series, it carries a GP50 manufacturer grade with a C5/C6 material grade classification. The insert features a 60-degree V-thread form and is finished with a Titanium Nitride (TiN) coating applied via PVD process, which improves wear resistance and extends tool life in production threading applications. External pitch range covers 10 to 44 TPI and internal pitch range covers 9 to 24 TPI. This insert is installed by machinists and tool-room technicians in CNC lathes and manual turning centers.
This insert is suited for threading operations on a wide range of materials where C5 or C6 carbide grades are appropriate, including steel and cast iron applications. The right-hand orientation and 60-degree included angle make it compatible with standard unified and V-form thread profiles. It fits residential, commercial, and industrial machining environments where consistent thread quality and insert-to-insert repeatability are required across high-volume or repeat-run jobs.
Designed as an OEM-style replacement threading insert for Flo-Lock series toolholders accepting FLTK-style, size 3 inserts with a 60-degree thread form.
Threading inserts should be installed and indexed by qualified machinists or tool-room personnel. Power down and lock out the machine spindle before changing or indexing any insert. Use the correct torque wrench and insert key for the toolholder manufacturer specifications to avoid cracking the carbide. Inspect the insert pocket and clamping components for wear or debris before seating a new insert.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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