Products for bench top machinists | LittleMachineShop.com

Insert, TPMW-221 HSS

Insert, TPMW-221 HSS - Main image
$9.58 $12.95 In stock

TPMW-221 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 40°-60° single countersink, and there is no chip breaker.

It has an inscribed circle (IC) of 0.25" (1/4"), a thickness of 0.125" (1/8"), and a corner (nose) radius of 0.0156" (1/64").

The insert is designated TPMW221 (ANSI) or TPMW110304 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.

Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy
If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy
Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy
Returning an item

Check the return conditions before sending anything back.

United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

View policy

Customer Reviews (4.8 / 5 · 5 reviews)

Emma N. ★★★★★

I've been using these T-15 inserts for finishing mild steel, and the 60° triangle geometry gives great chip control. The edge holds up noticeably longer than the carbide I was using before, even at moderate speeds. Definitely a solid upgrade for my small lathe setup.

Madison N. ★★★★★

The 11° relief on this T-15 insert makes it a perfect drop-in for my indexable holders—no more wrestling with brazed blanks. It holds a sharp edge through a long run of stainless, and the triangle geometry cuts clean without chatter.

Joshua Y. ★★★★★

Cutting a 60° internal thread in some hardened 4140, this insert held its edge way longer than the carbide ones I'd been burning through. The T-15 steel really does combine wear resistance with that sharp finish high-speed steel is known for.