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Product Price Qty
15/64" D x 3/4" H x 1/2" Shank Rockler Undersized Straight Bit
15/64" D x 3/4" H x 1/2" Shank Rockler Undersized Straight Bit Item #90330
In stock
$15.99 Each
23/32" D x 1" H x 1/2" Shank Rockler Undersized Straight Bit
23/32" D x 1" H x 1/2" Shank Rockler Undersized Straight Bit Item #90627
In stock
$24.99 Each
31/64" D x 1" H x 1/2" Shank Rockler Undersized Straight Bit
31/64" D x 1" H x 1/2" Shank Rockler Undersized Straight Bit Item #90528
In stock
$19.99 Each
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Rockler Undersized Straight Router Bits - 1/2" Shank

Slightly undersized to cut tight-fitting grooves and dadoes for plywood that measures less than its stated nominal thickness.
Item #
GRP2115_2
Rating:
90% of 100
(37)
These straight bits are slightly undersized to cut tight-fitting grooves and dadoes for plywood that is thinner than its stated nominal thickness, which applies to most plywood and veneered MDF. Typical straight bits leave an unsightly gap when used for plywood joinery. Use these bits to cut grooves, dadoes and rabbets. Of course, they can also be used for general purpose material removal or any application which requires a flat, finished bottom. The two-flute cutters give a smooth finish with a medium feed rate. Two flutes, 1/2" shank.
(1) Rockler Undersized Straight Router Bit, 1/2" Shank
More Information
Brand Rockler
Weight 0.1500
Tech Spec
  • 15/64" D x 3/4" H x 1/2" for use with 1/4'' plywood
  • 23/32" D x 1" H x 1/2" for use with 3/4'' plywood
  • 31/64" D x 1" H x 1/2" for use with 1/2'' plywood
Bit Type Straight
Shank Size 1/2"
Flutes 2
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4.5 / 5.0
37 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
29
4
0
2
2
It was just what I needed for my project
April 15, 2020
Purchased
 2 months ago
Woodworking Experience:
Intermediate
Good value
Performed very well, cut multiple sacks in construction grade plywood without tearout
February 20, 2020
Woodworking Experience:
Intermediate
Made my first router project easy. Used the 23/32" bit to cut dado and rabbets in 3/4" plywood for built-in bookshelves. Dados fit the plywood perfectly.
July 26, 2019
Purchased
 11 months ago
Woodworking Experience:
Beginner
the undersized straight shank router bit
It worked perfectly. The undersized panels fit perfectly with just the right amount of snugness. The bit was sharp. It cut without tearing up the veneer.
April 1, 2019
Purchased
 1 year ago
Woodworking Experience:
Advanced
Tightest Joint Ever
The first time I used this was for some rabbit joints. They couldn't have been any tighter, or I would have had to sand the piece to get it into the rabbit. These are great.
May 26, 2018
Purchased
 over 2 years ago
Woodworking Experience:
Intermediate
very good
What can I say it's a bit
April 27, 2018
Purchased
 over 2 years ago
Woodworking Experience:
Advanced
I only used the 23/32" router but with 1/2" shank for one shelf dado but I can say my shelf slid right in nicely and looked good. For multiple dados in a tall end wall bookcase cabinet you need to make a jig to use with your router.
November 6, 2017
Purchased
 over 2 years ago
Woodworking Experience:
Beginner
The bit worked great. Nice clean cuts and great fit up on my book cases. The alternative was using a smaller bit and making several passes.
September 29, 2017
Purchased
 over 2 years ago
Woodworking Experience:
Intermediate
perfect fit
bought 3 bits for 1/4, 1/2 and 3/4 plywood. These bits create perfect fits for dados. I wasted tons more time adjusting a guide - now I just make one cut with the router. Totally worth the money.
Tom
August 21, 2017
Purchased
 over 2 years ago
Woodworking Experience:
Intermediate
Good bits
i used the 3/4" undersized bit for dados on a bookcase. Worked well with plywood shelves.
June 9, 2017
Purchased
 over 3 years ago
Woodworking Experience:
Intermediate
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Browse 1 question Browse 1 question and 1 answer
Why did you choose this?
Rockler Store
Cause I like these bits
Morris E on May 1, 2018
Working with plywood’s in shop and most of this material is undersized
Randall L on Mar 4, 2018
Cause I like these bits
Morris E on May 1, 2018
using 23/32" plywood
David D on Mar 21, 2018
Working with plywood’s in shop and most of this material is undersized
Randall L on Mar 4, 2018
Replacing broken bit
Steve E on Feb 23, 2018
Building shop cabinets with 3/4 inch plywood
Joe W on Jan 31, 2018
Going to create drawers using plywood.
David R on Jan 21, 2018
to cut plywood drawer bottom grooves
James R on Dec 18, 2017
Husband's Christmas list.
Cheryl V on Dec 14, 2017
Don't have one, needed item to get free shipping.
Michael T on Nov 30, 2017
Needed for kitchen cabinet build - product ubavailable at any local stores. I am a loyal and repeat Rockler buyer.
David L on Oct 27, 2017
Most every wood type furniture grade plywood I get from Edensaw Woods in Port Townsend, Washington is 23/32nds thickness. A 3/4" straight bit is too wide.
Carl C on Jul 6, 2017
I need this to replace a missing router bit and in order to create some panels with 1/4 inch plywood.
Ralph W on Jun 3, 2017
My husband wants this product for Father's Day.
Karen J on Jun 1, 2017
To get a better fit for plywood part glueup
Colin C on May 22, 2017
I chose this bit for routing dadoes in undersize plywood.
Darrell W R on May 8, 2017
excellent products always, will last me for a long time.
JOHN C on Apr 15, 2017
Need to build some tool storage panels out of Oak and "1/4" inch plywood. This will cut the correct size dado in the oak.
DrJ on Jan 28, 2017
need
Mark R on Jan 24, 2017
I'M WORKING WITH 1/4 PLYWOOD THAT IS UNDERSIZE.
Jerry F on Jan 1, 2017
30% Off Sale
Gregory M on Nov 26, 2016
Rockler has very accurate plywood sized router bits, so I always purchase Rockler Brand when I need them.
Sean V on Sep 5, 2016
needed the correct size for plywood
Mark Y on Aug 28, 2016
It;s my first items because I need to build my closet and drawers
JORGE M. L on Aug 23, 2016
I'm building some bookshelves and anxious to use my router that I've had for 8 years and yet to use! Electrician, finally setting up a woodworking shop. Rockler appears as a solid company committed to quality so I chose them.
Marlin T on Aug 1, 2016
More professional looking joinery
Peter A on Apr 24, 2016
Needed to cut rabbets for plywood drawer bottoms.
James k on Apr 20, 2016
Joining plywood
Dale on Apr 15, 2016
Saves time and ensures proper fit
Edward B on Apr 12, 2016
perfect
john i on Mar 14, 2016
To Cut <br /><br />cut a mortise for 15/32 plywood
Glinn W on Mar 8, 2016
To use for routing drawer boxes for the bottoms. Hopefully will be a one shot deal with this!
Shark928 on Jan 10, 2016
Needed it for a job
Hooter on Sep 24, 2015
makes a good tight fit on 3/4 ply
PAUL B on Aug 13, 2015
I have a set of these but the most used one has gotten a lot of wear and will need to be replaced soon. Now I have the spare for when the original one is gone.
EDWARD L on Jul 19, 2015
Hobby work shop.
Billy Y on Jul 16, 2015
wanted to try 1/2 shank straight bit
Jack K on Jun 19, 2015
Good value!
Brian M on Jun 1, 2015
Because the "new" plywood is undersized.
Jerry on May 29, 2015
I need it for dado work for a cabinet I'm making. I hope I like it better than the folding platform.
Harold O on May 4, 2015
excellent for cutting tight fitting dadoes for shelf configurations
John M on May 1, 2015
CABINET MAKER USE FOR UNDERSIZE PLYWOOD 3/4 =23/32JUST RETIRED CAN'T MAKE THESE G-JOBS AT WORK ANY MORE,WOOPEE!!!
robert r on Apr 18, 2015
I have a LOT of plywood dados to cut for my next project and I don't want to commit my table saw for dedicated dados.
Jason L on Apr 16, 2015
using 23/32" plywood
David D on Mar 21, 2018
Replacing broken bit
Steve E on Feb 23, 2018
My 3/4 plywood is 0.688 inches. 23/32 is 0.719. What is the actual width of the slot?
Bill G on Sep 11, 2018
BEST ANSWER: Hi Bill, I don’t deal with 100th of a inch often when working with wood as it’s just not done being that those tolerances are not easily achieved. So I would say just use the bit that is 23/32. It may be a little tite so you may have to sand the plywood down a touch on the edges to make it fit. Good luck.
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.
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