Products for bench top machinists | LittleMachineShop.com

Insert, TCMW-321 HSS

Insert, TCMW-321 HSS - Main image
$7.99 $10.95 In stock

TCMW-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 7° relief. The center hole is a 40°-60° 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 TCMW321 (ANSI) or TCMW160304 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)

Ella ★★★★★

Wasn't sure how HSS would hold up compared to the carbide I usually run, but this T-15 insert has been a nice surprise on mild steel. The 7° relief keeps it from rubbing on the finish pass, and swapping it into my existing holder took seconds.

Emily O. ★★★★★

Bought these for a manual lathe job where I couldn't justify full carbide, and the T-15 steel holds an edge way longer than the HSS bits I was using before. The 7° relief gives a nice free cut without rubbing.

Elizabeth S. ★★★★★

Been running the T-15 high speed steel version on my boring bar for a few weeks now and the edge holds up way better than the carbide I was using before. The 7° relief gives it a nice free cut on mild steel, no rubbing or chatter. Indexing them is quick and I'm getting a lot more life per edge than