Products for bench top machinists | LittleMachineShop.com

Insert, TPMT-222 Carbide

Insert, TPMT-222 Carbide - Main image
$5.41 $7.95 In stock

TPMT-222 carbide is a 60° triangle with a 11° relief. The center hole is a 40°-60° single countersink, and there is a single-sided chip breaker.


It has an inscribed circle (IC) of 0.25" (1/4"), a thickness of 0.125" (1/8"), and a corner (nose) radius of 0.0313" (1/32").


The insert is designated TPMT222 (ANSI) or TPMT222GP (ISO).

Inserts are sold individually—no need to buy a pack of 10 inserts.

*NOTE: 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.

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Customer Reviews (4.6 / 5 · 5 reviews)

Harper B. ★★★★★

The 0.25" inscribed circle is a perfect fit for my smaller boring bars, and the chip breaker on these inserts really helps control those long stringy chips. I've been running them on 4140 steel and the edge holds up noticeably better than the cheaper inserts I tried before.

Charlotte ★★★★★

These insert the part of my lathe tool holder perfectly, and that 1/4" inscribed circle gives nice, rigid cuts on my small steel stock. The single-sided chip breaker clears the chips away cleanly, so I didn't have to stop and clear a bird's nest once.

David O. ★★★★★

The 11-degree relief on these TPMT-222 inserts gave me a noticeably cleaner finish on my stainless steel parts. They hold an edge well through a full run, and the single-sided chip breaker kept the swarf manageable.