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Mortise Chisel Bit 3/8"

Item #
80% of 100

The bit removes most of the material, and the chisel squares up the sides, allowing you to cut precise 3/8” mortises for mortise-and-tenon joints. Fits the Jet Benchtop Mortising Machine (#81421, sold separately).

(1) Mortise Chisel Bit 3/8"
More Information
Weight 0.3000
4.0 / 5.0
6 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Works well, sharp out of box.
Much improved over the chisels that come with the Jet Mortiser. I will be buying other sizes as the need arises.
August 19, 2019
11 months ago
Woodworking Experience:
i havent used it in anything heavy but in 1/4 thick maple it did a nice job
May 23, 2018
over 2 years ago
An excellent Rockler tool
Sharp & precise!
November 14, 2017
over 2 years ago
Woodworking Experience:
I had to shorten the drill shank to work in my delta mortise.
April 19, 2018
over 2 years ago
Woodworking Experience:
I was supprised how sharp it was when new,but after numerous holes it started smoking even when going slow into 4x4 pine legs.
September 21, 2019
10 months ago
Woodworking Experience:
Head of the drill bit was nicked and the tips of the 4 corners were not even. Had a friend sharpen the bit and the chisel and it then worked fine. Bit would fit my 5/8 inch collar on the mortising attachment to my drill press. All the better bits I found required a 3/4 inch collar so I was so of stuck with what I had. OBTW, Rockler's return policy/process is difficult to use.
May 12, 2018
over 2 years ago
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Browse 8 questions Browse 8 questions and 23 answers
Why did you choose this?
Rockler Store
need it
Richard T on Jun 17, 2020
need one
Cindy T. on Dec 9, 2019
need it
Richard T on Jun 17, 2020
Recommended by friend.
James O on Apr 9, 2020
need one
Cindy T. on Dec 9, 2019
Replace old chisel
GaryP on Sep 8, 2019
Makes mortising more efficient and precise
Kennneth S on Aug 4, 2019
To speed up the mortising process
CAROL O on Aug 2, 2019
Quality and reviews
MarkZ on Jan 5, 2019
Old one was worn out.
William C on Jan 4, 2019
Timothy J G on Dec 28, 2018
I could buy one high quality bit without having to buy an entire set.
Aaron K on Nov 9, 2018
Hard to find one with a 5/8 inch collar
James Y on Apr 20, 2018
Making a cradle for great grandson and can't find the old one.
Paulette R on Apr 11, 2018
Robert M on Jan 12, 2018
i need it
J D on Jun 20, 2017
I needed the bit
M F on May 15, 2017
Building a baby bed.
mark s on Dec 12, 2016
I purchased a new Powermatic mortiser and this auger bit and square chisel was recommended. I trust Rockler for their choice in products.
Mike M on Aug 13, 2016
I need it for chiseling out mortises.
Stephen H on Aug 11, 2016
Good enough quality for occasional use,
William M on Jul 30, 2016
Recommended by friend.
James O on Apr 9, 2020
Replace old chisel
GaryP on Sep 8, 2019
I'm a novice woodworker. Can I use a standard drill press with a mortise chisel Bit?
Drummer on Feb 19, 2016
BEST ANSWER: Not without a Mortising attachment
Will this mortising chisel fit a Delta mortising machine?
Philip H on Jan 11, 2016
BEST ANSWER: Will this mortising chisel fit in Delta Model #17-935 mortice kit?
How long is the exposed shaft of the bit above the shank when fully retracted? I have a chisel I can't use with a Delta mortising attachment because the bit shaft is not long enough to reach the teeth of the chuck when fully retracted into the chisel, and I don't need another one of those.
John H on May 20, 2016
Does this bit have the short or the long shank? Want to ensure it will fit a Powermatic mortiser.
Thomas n on Nov 23, 2018
BEST ANSWER: It has the long shaft, it fit my power matic mortiser, very happy with it
What is the diameter of the shank of both chisel and drill? I have an off brand, need to know diameters to know it will fit.
bill f on Jan 19, 2016
BEST ANSWER: Diameter of the bit is 1/4"
Diameter of the Chisel is 5/8"
Do you sell mortising drill bit and chisel that fits a Craftsman hollow chisel mortise?
Henry F on May 14, 2018
I'm need the mortising drill bits and chisels that will work in a Craftman Hollow Chisel Mortiser?
Henry F on May 14, 2018
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