$37.99 Each
In stock
Adjustable length clamp provides pressure from all four sides for big projects like gluing table tops and shelving.

Rockler 4-Way Equal Pressure Clamp

Item #
20981
Rating:
70% of 100
Adjustable length clamp provides pressure from all four sides — ideal for big projects such as gluing table tops and shelving. To make wood pieces, drill a series of 5/8" holes spaced 2" apart down the center line of the board face of a 2x4 piece of lumber. Then rip the board lengthwise through the centers of the holes, creating two pieces approx. 1-1/2" x 1-11/16". Rotate the notched boards so that notches are away from each other.

Features:
  • Applies pressure on workpiece face when edge-clamping to prevent bowing and buckling large panels
  • Clamp attaches to any length 2 x 2's (lumber and wood clamp pads not included)
  • One Clamp per Package
  • Includes one set of 2 parts (Two sets shown in photo)
(1) 4-Way Equal Pressure Clamp
More Information
Brand Rockler
Weight 3.1500
Technical Documents
Prop 65 WarningWARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov

3.5 / 5.0
66 Reviews
5 Stars
4 Stars
3 Stars
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1 Star
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Keeping it together!
I've used these to glue a 1x10 and a 1x8 together and they worked perfectly! I would recommend cutting the 2x4 in half first and then drilling the holes. It will give you more depth in the holes. Not a lot but every little bit helps.
April 30, 2019
Purchased
1 year ago
Woodworking Experience:
Advanced
Great clamps
These clamps have significantly improved my panel glue ups. Highly recommended
March 24, 2019
Purchased
1 year ago
Woodworking Experience:
Intermediate
Best clamps
The best clamps for cutting board glue-up. Keeps the boards aligned so there is less time getting the glue-up sanded plan and less waste of material. Can’t go wrong with a set of these!
User submitted image
Added Jan 19, 2019
January 19, 2019
Purchased
8 months ago
Woodworking Experience:
Advanced
clamps
Made two sets of bars for these clamps (long and short). Bars are easy to make and they store well. recommend using a hardwood backer on the pressure rail.
January 12, 2019
Purchased
8 months ago
Woodworking Experience:
Advanced
love them
love them, they work so well, thinking of ordering another
set.
January 6, 2019
Purchased
8 months ago
Woodworking Experience:
Intermediate
Took a while to get things all set up but I’m certain they will do the job!
January 6, 2019
Purchased
8 months ago
Woodworking Experience:
Advanced
Works great!!
January 5, 2019
Purchased
8 months ago
These work amazing. I used 1 1/2 by 1 inch 11 gauge metal tube and hardwood blocks with my clamps. They flatten and pull the wood joint tight at the same time. These make glue up joints much easier if you are doing them by yourself.
November 2, 2018
Purchased
1 year ago
Woodworking Experience:
Advanced
Great panel clamp tool
These work great as I do a lot of board panel gluing. I used 1-1/2" oak for the notch bar and before cutting in half I painted one of the ends with a different color so that the notches would all line up and be identical match when clamping. To make things easier I made sure that the bottom part of clamp that goes into the notch was on a flat surface and in the notch so all that was needed then was to slide the top notch board through the clamp fixture and apply the pressure to the panel and every panel I did came out flat as could be. I did use wafers to help line up the edges. I put wax paper over the notch bars so that the glue wouldn't stick to the them.
July 6, 2018
Purchased
1 year ago
Woodworking Experience:
Advanced
great
love them both
June 30, 2018
Purchased
1 year ago
Woodworking Experience:
Intermediate
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 7 questions Browse 7 questions and 8 answers
Why did you choose this?
Rockler Store
want better control with making tables
Todd M on Jun 27, 2019
Been looking for something like this for a while
Dennis N on Jan 1, 2019
want better control with making tables
Todd M on Jun 27, 2019
Great idea for furniture building 😀
William A on Jan 23, 2019
Been looking for something like this for a while
Dennis N on Jan 1, 2019
to save time while gluing items in my shop
John P on Dec 26, 2018
I'm making some doors and want to use solid wood instead of plywood. These clamps will make it easier to join together.
Tim S on Dec 23, 2018
Should be great for gluing up my cabinet doors. I've been having a problem keeping them flat.
Robert T on Dec 23, 2018
These clamps should be great for gluing table tops.
Johnny H on Dec 22, 2018
I will be using these clamps to assemble pallet wood panels.
George D on Dec 22, 2018
On Sale
Robert S on Dec 22, 2018
Going to make a large tabletop
Joe D on Dec 22, 2018
I BELIEVE THESE WILL BE THE ANSWER TO LARGER PROJECTS
JOE B on Dec 22, 2018
A better way to clamp - solves a problem. Good reviews.
Vickie M on Dec 22, 2018
I have been looking for a good way to clamp tabletops. These look perfect. Can't wait to try them!
Paul S on Dec 20, 2018
After having to use multiple bar clamps to keep a counter top I built from bowing, I believe this clamp will simplify the process on my next project.
John L on Dec 18, 2018
Looks like a good idea to keep the boards straight...
Bo Marstrand W on Dec 18, 2018
They provide an easy way to customize the length of the clamping "bar".
Robert H on Dec 17, 2018
I have been needing some even pressure clamps and these look like they will do just that.
Robert O on Dec 16, 2018
I have special project where I need to clamp all four sides simultaneously and this appears to be just what I needed.
William B on Dec 15, 2018
These clamps will make gluing large panels together easier.
Brad S on Dec 15, 2018
I think this is an innovative clamping method and wanted to try it out! As with all products purchased from Rockler I have been very satisfied with the quality and pricing.
Mickey on Dec 15, 2018
My son often works independently on his projects so having these clamps will be a big help for him!
H A on Dec 15, 2018
Nice to have another option in my clamp array.
Daniel on Dec 15, 2018
I make a few table tops and this seems to help me save some time
Richard c on Dec 15, 2018
Christmas
Lynn K on Nov 23, 2018
It will assist me in the way I want for my wood projects
Ward F on May 31, 2018
Rockler quality. I have begun gluing up mor panels.
Raymond D on May 31, 2018
to build a small table from salvage long leaf pine for my wife
Robert H on May 31, 2018
I used to have a set very much like these, apparently someone needed them more than I did, so I had to get another set
Matt D on May 30, 2018
It will be a very useful item for gluing up large projects.
Thomas G on May 30, 2018
Love my other clamps
Bruce C on May 30, 2018
need it for a project I'm working on.
Simon K on May 30, 2018
They were on sale and i have a project coming up where I will be gluing large panels together.
Ryan G on May 29, 2018
try my luck at building a farm table.
John C on May 28, 2018
I've been wanting a pair for a long time. If I recall correctly, ShopSmith was the only place you could get these in the 1980s. So yes, a long time. (grin) This sale price was the first time I've seen this type of clamp for anything reasonable.
Quin L on May 27, 2018
Cause I wanted them!
HOWARD D on May 27, 2018
Saw a YouTube video of some guy using them. I frequently glue up panels. So, this is just the ticket.
Darrell on May 27, 2018
Have a new special dining room table to make.
William B on May 27, 2018
easy to make custom cauls of varying length without having to remove hardware. Will see just how finicky it is to use.
Rayne on May 26, 2018
Looks like a tool that will make my work simpler. May buy another later.
Larry on May 26, 2018
I thought it might be useful and require fewer clamps for certain applications. Hoping it will keep panels flat when clamped.
Charles L on May 26, 2018
I purchased them because they were on sale.
David M on May 26, 2018
I need them
Edward M on May 26, 2018
Have 3, needed 2 more to do a long door
Geoffrey B on May 26, 2018
Great for clamping veneer
Larry B on May 26, 2018
I've always had problems with large tops bowing under side pressure, and it's clumsy adding other clamps to keep the piece flat. Hopefully, these clamps will end the problem.
James K on May 26, 2018
Perfect set of clamps for glue-ups, cuttings boards, etc...
Anthony C on May 26, 2018
For gluing up table tops
marty s on May 25, 2018
Always wanted to try.
Daryl E on May 25, 2018
Takes less clamping time the using c-clamp grips
Charles W B on May 25, 2018
Gluing up panels for boxes. I have a bunch of 5" cedar boards to make bee boxes, blanket boxes and chairs.
Kirk W on Mar 29, 2018
Great idea for furniture building 😀
William A on Jan 23, 2019
to save time while gluing items in my shop
John P on Dec 26, 2018
Im building a tabletop thats 3 x 4 salvaged lumber. Will these fit? Also, the table will be about 8 ft x 5ft, how many clamps would you recommend?
Sam S on Apr 5, 2016
How thick of material can these clamps accept?
Bobs5050 on Aug 3, 2015
BEST ANSWER: I've only clamped up 3/4 stock with them, they work ok.
If I order one of these, do I get a clamp for each end?
Fred J on Nov 25, 2016
BEST ANSWER: Yup, one end has the crank and the other has a passive spring clamp.
How thin can these work? I am trying to make a panel 33"X 1/4
Jack_7e S on Mar 25, 2017
BEST ANSWER: We used these clamps on 3/4" material and they work very well. I would think 1/4" material would work fine - just plan your work.
How much pressure does the 4way pressure clamp exert on all sides?
Adam H on Nov 25, 2016
BEST ANSWER: It exerts enough pressure to squeeze the glued joints together while keeping the boards even. Wipe the joints after clamping and there is very little clean up and leveling of surface to be done when dry.
Do these exert any downward pressure as well as edge pressure? Could they be used to edge glue and thickness laminate at the same time? What about if you mill a slight crown into the clamping board? Do the clamps draw down on the end of the clamping board when you tighten them?
Dewesq55 on Nov 26, 2017
BEST ANSWER: I use these clamps when I need pressure from the sides and across the top of the boards being glued. They provide both. Of course, the boards you make as the “clamps” must be flat or have a little bow so they they will be drawn down flat when clamped.
Would these work for 10" x 16" cutting boards?
Jeff C on Dec 18, 2018
BEST ANSWER: Yes, they should work well for that.