Products for bench top machinists | LittleMachineShop.com

Insert, TPMB-322 HSS

Insert, TPMB-322 HSS - Main image
$9.71 $12.95 In stock

TPMB-322 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 0.0313 (1/32").

The insert is designated TPMB322 (ANSI) or TPMB160308 HSS (ISO). For a list of compatible LittleMachineShop.com products, see the Compatibility tab.

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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Customer Reviews (4.4 / 5 · 5 reviews)

Aurora ★★★★★

Cutting threads in some tougher stainless steel was a breeze, and that 11° relief really helps with chip clearance. I've been using the same insert for a few dozen holes and it's still going strong.

Adam ★★★★★

These T-15 HSS inserts hold an edge noticeably longer than standard carbide in my manual lathe, and the 60° triangle shape indexes perfectly without any wobble. Saves me from constant resharpening, which is exactly what I needed for softer steels.

Christopher ★★★★★

The 11° relief on this TPMB-322 insert makes a noticeable difference in chip flow on my lathe, and the T-15 HSS steel holds an edge longer than I expected. It's a solid upgrade over standard carbide for non-ferrous work where I need a sharp finish.