$24.99 Each
In stock
Replacement Square Radius Cutter for our corresponding Mini and Pen Turning Ergonomic Carbide Turning Tools.

Sr1 Replacement Cutter for Pen and Mini Carbide Turning Tools, Square Radius

Item #
94% of 100

Take a close look at the edge of this carbide insert and you'll realize it's not actually square. Instead, each of its four edges is slightly crowned with a 2'' radius. This subtle change makes the cutter excellent for smoothing cuts. Use it with the corresponding Rockler Mini Ergonomic Carbide Turning Tool (#49804, sold separately) or with the square radius tool included in our 3-Piece Pen Turning Set (#47600, sold separately). No sharpening required — just rotate to a new edge when the previous edge gets dull, and replace the cutter when needed.


  • Crowned edges for smooth finishing cuts
  • Solid carbide for a long life
  • Factory sharpened—ready for use right out of the box
  • This carbide cutter is not compatible with a standard square turning tool. Use it with the handle included with the 3-Piece Carbide Pen Turning Tool Set (#47600, sold separately) or Rockler Carbide Mini Turning Tool 3-Piece Set (#45142, sold separately).
(1) Sr1 Replacement Cutter for Pen-Turning and Mini Carbide Turning Tools, Square Radius
(1) Replacement Screw
More Information
Brand Rockler
Weight 0.0200
Tech Spec
  • Material: Solid carbide
  • Shape: Square Radius
  • Radius: 2''
  • Dimensions: 1/2'' x 1/2''
  • Compatible Turning Tools: #49804 and Square Radius tool included with #47600
Tool Type Speciality
Prop 65 WarningWARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov

Prop 65 WarningWARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood
4.7 / 5.0
10 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Cuts Like New
When it starts tearing the wood, it's past time for a new cutter. This one made mine cut like new again.
June 21, 2019
3 months ago
Woodworking Experience:
only way to go especially on small stuff
July 7, 2018
over 2 years ago
Woodworking Experience:
great for turning pens have learned how to sharpen them they may last a long time
April 17, 2018
over 2 years ago
Woodworking Experience:
Perfect fit replacement or upgrade
I bought this cutter to replace the original straight cutter that came with my mini turning tool. It fits perfectly.
January 20, 2018
1 year ago
Works very well. Stays sharp long especially when working wood blanks. When it feels dull, I just loosen the set screw and turn the cutter to a new edge and re-tighten the screw. It just takes a second and I'm ready to go again. Easy to replace the cutter when all the edges are dull. It would be helpful if the edges were numbered to make it easier to keep track of the dull edges. I use a marker to highlight the used edge when I change it.
May 19, 2016
over 3 years ago
Woodworking Experience:
So easy - no sharpening needed
These make turning so easy. When the turning gets a little tough, I simply unscrew the cutter, make a quarter turn, rescrew and I'm back in business.
April 15, 2016
over 3 years ago
Pen turning
Great for ceramics!
August 20, 2015
over 4 years ago
Woodworking Experience:
Works as I hope it would
June 21, 2015
over 4 years ago
Woodworking Experience:
What I needed.
September 3, 2019
6 months ago
Woodworking Experience:
While the quality seems equal, the Rockler replacement cutter is considerably more expensive than a comparable part for Easy Wood tool.
November 6, 2018
11 months ago
Woodworking Experience:
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 4 questions Browse 4 questions and 44 answers
Why did you choose this?
Rockler Store
old cutters are getting dull.
J A on Aug 25, 2019
replacement cutters for turning tool
Dan H. on Jul 21, 2019
old cutters are getting dull.
J A on Aug 25, 2019
Review are great.
troy c on Aug 23, 2019
replacement cutters for turning tool
Dan H. on Jul 21, 2019
needed a spare
Steve C on Jul 9, 2019
Old cutters are hard to re-sharpen for reuse.
ROD O on Jun 12, 2019
Needed replacement for turning tool
Dan on Jun 11, 2019
replacement extra
michael jordan J on Jun 7, 2019
Replacement for old one.
Richard H on May 31, 2019
They stay sharp longer.
Jerome T on May 9, 2019
Need a spare to keep on hand
John M on Apr 21, 2019
To have replacement on hand
Allen Y on Mar 13, 2019
Mine got dull needed a replacement
Jody on Feb 16, 2019
To use for smoothing out work.
Robert J on Nov 16, 2018
Lost the original one that came with the tool
James V on Jul 30, 2018
Robert B on Jun 30, 2018
dull blades are no good.
Alfred C on May 16, 2018
Always keep a replacement on hand.
REG P on Dec 29, 2017
I like to keep replacements handy.
LARRY M on Nov 24, 2017
shop use
P A on Oct 11, 2017
Time for replacement
Turtle12550 on Jul 3, 2017
cutter replacement
Eric M on Apr 9, 2017
Replacement. cutter
Cory S on Apr 4, 2017
To replace one that broke on first use.
Dan G on Mar 29, 2017
Replacement for the one I wore out.
CAD-Man on Mar 6, 2017
Great price and wonderful results!!!
David on Jan 27, 2017
Love these carbide tips- last me about a year - when they get dull, I turn a quarter way and it's like new again!
William H. on Nov 26, 2016
to have a replacement
Russell M on Nov 8, 2016
i needed to replace my cutters
B A on Sep 18, 2016
back up
Jack M on Apr 4, 2016
Wanted to try it out.
Rod D on Feb 21, 2016
Less sanding. Very easy to change cutters, would like to get new screws and tore bit with them
Daniel W on Jan 14, 2016
Replacement for Plastics and Acrylic turning
GERALD M on Nov 19, 2015
Needed after turning many pens
Scott M on Nov 17, 2015
Love the carbide...had to try it
Karen N on Oct 28, 2015
Needed replacement tip
Bruce M on Oct 22, 2015
wanted to try the new shape roughing blade
Bruce P on Oct 13, 2015
My old carbide tip needed to be replaced. Plus, I have some projects planned with very hard wood. I wanted a fresh blade for a nice clean cut
Kacy W on Aug 11, 2015
For replacement
Michael M on Jul 26, 2015
Nice way to start out making pens without the learning curve of normal turning knives
Gregory on Jul 1, 2015
Needed to replace my old cutter
Ethan C on Jun 9, 2015
Review are great.
troy c on Aug 23, 2019
needed a spare
Steve C on Jul 9, 2019
I bought this set and wondered if the 1/2" square radius cutter will fit either the square or round handle? Or do I have to buy another handle for the radius cutter?
Stephen O on Jan 8, 2016
Sr1 Replacement Cutter for Pen and Mini Carbide Turning Tools, Square Radius
Sr1 Replacement Cutter for Pen and Mini Carbide Turning Tools, Square Radius
Mini Ergonomic Carbide Turning Tools, 3-Piece Set
Mini Ergonomic Carbide Turning Tools, 3-Piece Set
BEST ANSWER: The description in the catalog says it will fit the mini carbide square or the pen carbide square and NOT the full sized one. I didn't want to change out all the time, so I just bought the complete handle and cutter combo. I already had the mini carbide set which I use most of the time
will this fit the Rockler Mini carbide tool?
Bruce P on Oct 3, 2015
BEST ANSWER: Yes it will fit and it prevents catches due to the slight radius.
I use it all the time!
Hope this helps you Bruce.
Why is this cutter not compatible with other shafts using 1/2" cutters?
Darryl B on Dec 10, 2015
BEST ANSWER: It doesn't say that it doesn't fit other 1/2" carbide turning tools. It says clearly in the description that it doesn't fit a standard square square turning tool. That's because a standard square turning tool will only accept flat square cutters. This cutter has a 2" radius arc on all four sides. Therefore a "standard" meaning a flat square only type of turning tool can not use this type of cutter. There are many turning tools that will accept different types of square cutters. Some turning tools will accept square, round, diamond, curved and many more. All in only one tool.