Threading Tool, Int / Ext, 1/2" Indexable HSS Triangle Inserts, A R Warner Kit #18

This A.R. Warner precision HSS threading tool will turn both internal and external threads. You can mount inserts on both ends. One end mounts the insert at the end of the tool for external threading. The mount on the other end is offset. Mount the insert one way for internal threading. Turn the insert around and you can use the tool for external threading too.

The minimum bore diameter for internal threading is 1.375". The maximum thread depth of this internal and external threading tool is 0.100".

The Arthur R. Warner Co. is a family-owned American manufacturer of high speed steel products with specialization in cutting, shaping, pre-grinding, heat treating, and finish grinding of premium grades of flat high speed steel (and tool steel). Their quality is excellent and LittleMachineShop.com is proud to carry their products.

This tool ships with two kinds of inserts. The TPMC-32-NV insert is better in stainless and the TNMC-32-NV is better in alloy steels. You can use either for internal and external threading.

The difference is the relief angle. TPMC inserts have an 11 degree relief angle. TNMC inserts have a 0 degree relief angle.

T-15 is a grade of cobalt tool steel, which offers the highest hardness of most common high speed steel grades.

This heavy-duty, high-speed steel grade offers maximum cutting-edge endurance and wear resistance due to its high Vanadium content. The Cobalt content additionally lends it high temperature hardness and resistance to tempering.

We are big fans of High-Speed Steel. Find out why... What's So Good About High-Speed Steel?

Make sure you get the correct inserts and retaining screws for your indexable turning tools.

Our chart of indexable inserts shows which inserts and which screw to use with each of our indexable tools.

Here's a video that talks about high speed steel tooling.