Products for bench top machinists | LittleMachineShop.com

Insert, TCMT-21.50 Carbide

Insert, TCMT-21.50 Carbide - Main image
$3.63 $5.95 In stock

TCMT-21.50 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 0.008" (1/125").

The insert is designated TCMT21.50 (ANSI) or TCMT110202 (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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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.6 / 5 · 5 reviews)

Steven ★★★★★

The 7° relief on this insert gives noticeably cleaner cuts on my stainless steel parts compared to the last ones I tried. That single-sided chip breaker does a good job keeping the chips manageable, and the 1/4" IC size fits my holder perfectly.

Stella ★★★★★

I’m surprised how the 7° relief angle and chip breaker handle light finishing cuts without any chatter. The single countersink hole sits flush on my tool holder, and the 0.25" IC works perfectly for small parting work.

Stella F. ★★★★★

Finally tried these TCMT-21.50 inserts with the single-sided chip breaker, and they really do keep the chips from wrapping around the tool. The 7° relief is just right for the stainless steel parts I’m turning.