Products for bench top machinists | LittleMachineShop.com

Insert, TCMT-21.52 Carbide

Insert, TCMT-21.52 Carbide - Main image
$4.93 $6.95 In stock

TCMT-21.52 carbide insert is a 60° triangle with a 7° 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 0.094" (3/32"), and a corner (nose) radius of 0.0313" (1/32").

The insert is designated TCMT21.52 (ANSI) or TCMT110208 (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 (5.0 / 5 · 5 reviews)

Ava J. ★★★★★

Finally getting consistent surface finishes on 303 stainless steel after switching to these inserts. The 0.25" IC fits my tool holder perfectly and the chip breaker clears chips without clogging.

Benjamin X. ★★★★★

I was a bit skeptical about the 7° relief angle, but it really helps with chip clearance on my aluminum parts. The single-sided chip breaker is working better than I expected for finish passes.

Avery W. ★★★★★

The 60° triangle geometry seats nicely in my tool holder, and that single-sided chip breaker clears swarf without clogging. I’ve run a few passes and the edge is holding up well, so this one’s earned its spot in the drawer.