Products for bench top machinists | LittleMachineShop.com

Insert, TPMB-321 HSS

Insert, TPMB-321 HSS - Main image
$8.55 $12.95 In stock

TPMB-321 insert made from T-15 high speed steel, combine the advantages of high-speed steel cutting tools with the convenience of indexable tooling.

 
Insert is a 60° triangle with a 11° relief. The center hole is a 70°-90° single countersink, and there is no chip breaker.

It has an inscribed circle (IC) of 0.375" (3/8"), a thickness of 0.125" (1/8"), and a corner (nose) radius of 0.0156" (1/64").

The insert is designated TPMB321 (ANSI) or TPMB160304 HSS (ISO).

This high-quality insert is made in America by the Arthur R Warner company.

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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Express Shipping · United States: $3.99

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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 (5.0 / 5 · 5 reviews)

Kevin ★★★★★

Those 11 degrees of relief make a real difference in finish quality on my hardened steel parts. Cuts cleanly without chatter even at higher speeds.

Ella D. ★★★★★

Finally got around to swapping out the insert on my threading tool and this T-15 high speed steel is noticeably sharper out of the pack. Cuts cleaner with less vibration than the cheap blanks I was using before.

Natalie ★★★★★

The 11° relief on this insert makes a real difference—chips clear cleanly without that annoying chatter I get from other holders. I've got about four hours of interrupted cuts on it and the edge still looks sharp.