Products for bench top machinists | LittleMachineShop.com

Insert, TDEX-21.5 Carbide

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$5.46 $8.95 In stock

TDEX21.5 TiN coated C-5 carbide insert is a 60° triangle with a 15° relief. The center hole is a 70°-90° single countersink, and there is no 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 0.0156" (1/64"). The honed edge allows for heavier cuts and there are three cutting edges.

The insert is designated TDEX21.5 (ANSI) or TDEX110204 (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 (4.4 / 5 · 5 reviews)

Joseph B. ★★★★★

For a 60° triangle with that 15° relief, it seats nicely in the tool holder without any wobble, and the TiN coating’s got a nice gold sheen that makes it easy to spot on the bench. The single countersink hole lined up perfectly with my pin, and it’s handled a few interrupted cuts so far without chip

Jacob G. ★★★★★

The 60° triangle with 15° relief fit my holder perfectly, and the TiN coating is holding up well after several hours of turning steel. No chip breaker, so I have to manage stringers manually, but for the price these cut clean and true.

Grace ★★★★★

Bought these for my boring bar to touch up some 4140 and the TiN coating is holding up way better than the uncoated ones I was burning through. The 15° relief gives me enough clearance in tight bores without rubbing. No chip breaker, so I have to manage my feed, but for the price these cut clean.