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Corner Mortising Chisel

Easily square up shallow mortises for perfect hardware installations.
Item #
80% of 100
This easy to use spring loaded chisel instantly squares round corners on hinge mortises. Made of hardened steel that stays sharp. Just tap lightly with a hammer for a perfectly squared corner.
(1) Corner Mortising Chisel
More Information
Brand Rockler
Weight 0.3000
4.0 / 5.0
54 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Works as advertised.
February 13, 2020
2 months ago
Woodworking Experience:
Great working tool at a nice price
August 23, 2019
8 months ago
Woodworking Experience:
This tool will make it easier to have square corners, as well as eliminating some mistakes.
August 18, 2019
8 months ago
Woodworking Experience:
Corner Mortising Chisel
A good tool for the money....
April 2, 2019
over 4 years ago
Woodworking Experience:
Nice tool especially if your chisels aren't handy.
February 12, 2019
over 2 years ago
Woodworking Experience:
corner mortise chisel
this item works well, and if carefully used makes a nice clean, square corner on a routed out mortise.
July 25, 2018
1 year ago
Woodworking Experience:
Great service from the guys over at rockler as always ????????
March 27, 2018
over 2 years ago
Woodworking Experience:
Cornering Tool
An absolute necessity when routing out hinges.
March 14, 2018
over 2 years ago
Woodworking Experience:
Nice gadget fairly priced.
Nicely made and works as described. Easy to align and clips a clean corner.
February 13, 2018
over 2 years ago
Woodworking Experience:
Corner chisel
First time I used it, worked perfect and paid for the investment.
January 22, 2018
over 2 years 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 58 answers
Why did you choose this?
Rockler Store
clean corners after routing
Mark W on Mar 15, 2020
on sale and I need one
J T on Jan 29, 2020
clean corners after routing
Mark W on Mar 15, 2020
Had one years ago and lost it.
Larry P on Mar 8, 2020
on sale and I need one
J T on Jan 29, 2020
larry j on Jan 27, 2020
Square up drilled or routed corners sharply.
Michael P on Jan 27, 2020
my router cuts round corners. This tool will adjust round corners to 90 degree cleanly.
ANDREW K on Jan 26, 2020
Needed for projects requiring square cornered hinges
Bruce C on Jan 23, 2020
Finally was moved to put down my chisel and get the right tool. Good promotional price/value
John D on Jan 12, 2020
I like the products that Rockler picks to handle. I needed a corner chisel as I misplaced my old one. I expect to find the old one the same day the new one arrives. Tools get misplaced more than socks get lost in the dryer.
Joseph B on Jan 8, 2020
This will speed up my work on mortising for doors.
Ed S on Jan 8, 2020
use a router to rabbit inside of door frames for panel and want to give this a try
Jamie M on Jan 7, 2020
I'm about to install doors on between-stud cabinets; it seems like this would be useful!
Karen H on Jan 5, 2020
Just trying to speed up the process of installing hinges.
DAFShop on Jan 2, 2020
Very good price on a useful tool.
Tom D on Jan 1, 2020
use for cleaning up corners for hinges
Gary L on Dec 22, 2019
I don't own one yet. :)
Gary C on Aug 29, 2019
it was on sale and i dont have one
Po Harris E on Aug 29, 2019
To make easy corners after using router
James M on Aug 27, 2019
Quick square-up on inside corners
Earl B on Aug 23, 2019
try it
Michael B on Aug 23, 2019
Just to try
Alex D on Aug 19, 2019
Build a lot of cabinets, have always had great success with Rockler products.
Henry S on Aug 19, 2019
To chisel for hinges on a 6 panel door, to replace a hollow core door.
" " on Aug 18, 2019
making lots of cabinets
Jack Wein W on Aug 18, 2019
Have had one in the past and misplaced it and the price was good
Mark on Aug 16, 2019
I make several different sizes of Novelty Boxes and this seems easier than hand chise.
Stanley S on Aug 16, 2019
I just made a box last week & messed up 2 hinge mortise corners.
Joseph P on Aug 16, 2019
Handy for quick finish of mortises
RUSS S on Aug 16, 2019
I install alot of door jams and often need to cut in the hinge mortise
William C on Jul 6, 2019
I often have a hard time getting crisp corners on hinge mortises. This mortising chisel should fix that problem.
Wilhelm B on May 4, 2019
Old one finally gave out. I knew rockler would have what I need.
John S on Apr 17, 2019
needed it and it was on sale
Scott J on Mar 28, 2019
To square off hinges can't wait to get it. Just ordered two
Jason K on Mar 28, 2019
Cabinet making.
James G on Feb 2, 2019
A good tool for accuracy and speed
Brenda t on Jan 27, 2019
It looks easy and fast.
Mary H on Jan 25, 2019
I do a lot of mortising and thought this might make the work go easier
Michael D on Jan 22, 2019
Have a job coming up. Will help to complete job faster
eugene hammock B on Jan 21, 2019
Need it
James S on Jan 17, 2019
Chase B on Jan 16, 2019
Why weren't these available in 1968?
Charles T B on Jan 14, 2019
Great tool and priced right
DENNIS C on Jan 13, 2019
Looks like a good tool for those squaring-off needs once in awhile...and a good value
Paul O on Jan 10, 2019
JERRY S on Jan 6, 2019
I'm looking for something to cut my chisel time on a screen door project. I picked this because it was highly rated and not Bluetooth compatible, laser-guided or wi-fi enabled and it won't talk to me. Simple. I like simple.
Joseph Koenig I on Dec 30, 2018
Easy way to square up routered hinge mortises
Ronald S on Dec 13, 2018
Need to square off inside rabbets formed by router on inside bottoms of boxes
Michael K on Nov 10, 2018
Previous reviews were very positive
Mark S on Jul 10, 2018
Never used this type interested in seeing how well it works.
Kerryc C on Jan 31, 2018
Tired of fussing with chiseling out the corners for my hinges.
Becky O on Jan 23, 2018
Had one years ago and lost it.
Larry P on Mar 8, 2020
larry j on Jan 27, 2020
What are it's dimensions?
Crowing rooster on Dec 23, 2015
BEST ANSWER: The actual spring blade that comes out is 3/8 square and the whole unit that you see in the picture has a footprint of an inch square with a small edge that rides the corner that you are cutting out.
Does this Corner Mortising Chisel create a curved corner or a 90 degree corner? I'm looking for one that creates a rounded corner for door latch plates.
Sichuan on Dec 21, 2015
BEST ANSWER: This chisel cuts a hard 90 degree corner. We bought several for exactly the opposite problem; had to set square cornered hinges and our routed mortises naturally had a rounded corner. If you need a radiused corner for your hinges and a standard hinge mortising jig won't work the best alternative is to make your own jig and use a router.
What is the MAXIMUM cutting depth?
mountainman on Dec 21, 2016
BEST ANSWER: I believe it's 1/8"
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