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Rockler 4-Way Equal Pressure Clamp

Adjustable length clamp provides pressure from all four sides for big projects like gluing table tops and shelving.
Item #
20981
Rating:
74% 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
3.7 / 5.0
93 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
44
15
13
6
15
Love 'em
I got 4 of these and am considering getting more. Just beware that they are not meant to exert serious force to close gaps in your joint. I probably should just get better at making good joints instead of relying on a clamp to fix my mistakes.
May 26, 2020
Purchased
2 months ago
Works as advertized
I purchased 2 of these at the same time as buying 2 of the REALLY expensive ones. I've had several occasions to use both and below is my experience.

The clamp monsters (name modified) are all metal, very heavy and frankly, awkward to set up. The first time I used them, I had to use a little loc-tite to secure the hex screws from unscrewing during set-up.

For these 4-way clamps, I made three different lengths of interchangeable cauls to use with various projects widths. I added packing tape to the side touching the work to prevent gluing the cauls to the work piece. I now find myself reaching for these much more often than the expensive brand, due to their ease of use, the ability to simply change cauls so the clamps aren't so cumbersome and they are much lighter.
April 6, 2020
Purchased
6 months ago
Woodworking Experience:
Intermediate
4 way clamps
Works as intended, easy to set up
February 5, 2020
Purchased
6 months ago
Great clamps.
Great clamps for gluing up cutting boards. Plus I got them on sale for half off. Major score!
January 27, 2020
Purchased
6 months ago
Woodworking Experience:
Intermediate
Awesome product so much easier to setup large panels for clamping dont have to have something for keeping it flat then grabbing every clamp I have to keep it together
January 21, 2020
Purchased
6 months ago
Woodworking Experience:
Intermediate
Nice clamp hardware
Well made clamp hardware...functions nicely
December 28, 2019
Purchased
7 months ago
Woodworking Experience:
Advanced
clamps
works well
December 20, 2019
Purchased
9 months ago
Woodworking Experience:
Advanced
Great buy
Made a massive butcher block for my kitchen island and it works as intended, long set up but it minimized standing by 80%
User submitted image
User submitted image
User submitted image
December 11, 2019
Purchased
7 months ago
Woodworking Experience:
Intermediate
Not a proficient woodworker, so had to sublet the clamp manufacture. 1st attempt at a glue up was really good. Can't wait to start a project using only the clamps for glue ups.
1st attempt,  good results.  Still learning
1st attempt, good results. Still learning
November 26, 2019
Purchased
8 months ago
Woodworking Experience:
Beginner
Great 4 way clamps
They work awesome and easy to uee
October 29, 2019
Purchased
9 months ago
Woodworking Experience:
Intermediate
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 11 questions Browse 11 questions and 26 answers
Why did you choose this?
Rockler Store
Going to make maple counter top
Jim on Apr 28, 2020
Easy flexibility for different widths of panels.
Dennis L on Mar 31, 2020
Going to make maple counter top
Jim on Apr 28, 2020
the video was convincing
Michael J on Apr 2, 2020
Easy flexibility for different widths of panels.
Dennis L on Mar 31, 2020
Video convinced me these would help to get flat tight tabletops
John L on Jan 14, 2020
Am beginning to make two night stands and this will help in all the gluing of the tops and sides, so hope all stay flat when clamped.
Vern H on Jan 2, 2020
Looked at video and thought it would work! You can never have too many clamps!
PAUL J on Dec 25, 2019
based on detailed reviews hope these will make counter top and table top glue ups more efficient
Calvin B on Dec 25, 2019
I have had trouble with glue ups bowing and I plan on building a butchers block counter top and I don’t want to risk that bowing.
john a on Dec 24, 2019
I saw demo of clamp, and i was soled.
joseph h on Dec 23, 2019
50% Off Sale. Very useful for making panels, desktops / tabletops.
Jonathan D on Dec 23, 2019
I've been looking at these for a while as the perfect clamp to keep wide panel glue-ups from bowing, and at 50% off, I couldn't pass up the deal.
Scott H on Dec 23, 2019
I do a lot of gluing small projects
Ray F on Dec 23, 2019
keeping good pressure on blank glue ups
Gary L on Dec 22, 2019
Good price
Dave on Dec 22, 2019
I intend to use for large panel glue-up. I intend to provide feedback in a review once project is complete.
Mitchell A on Dec 22, 2019
To glue up a tabletop
Sheldon D on Dec 22, 2019
I've been waiting for a sale on these for some time!
Kris H on Dec 22, 2019
My husband wanted it.
JANET M on Dec 11, 2019
Watched a video that showed these clamps doing exactly what I needed.
Steven M on Dec 8, 2019
Past experience with this quality clamp hardware.
Cordell Roy C on Dec 7, 2019
Great idea
Woody on Nov 23, 2019
Looks like a clamp I can successfully use to make a table top.
David H on Nov 18, 2019
Gluing wide panels
Johnnie M on Nov 4, 2019
recommendation from artisan at the gatlinburg show.
William D on Oct 28, 2019
Replacing a set of these I purchased back in the 90's, hope this new set lasts as long as the first set did.
Phil Y on Sep 26, 2019
the cost
Kurt H on Sep 25, 2019
Great review of the product.
Kevin on Sep 25, 2019
Needed extra set
Wilfredo A on Sep 24, 2019
Reviews
Roy P on Sep 24, 2019
Looking for a way to make my table top glue ups better/easier/straighter.
George G on Sep 24, 2019
Need a way to glue up hardwood panels.
Warren R on Sep 23, 2019
Looks like a versatile clamping system for glue ups so I'll give it a try.
Duke on Sep 22, 2019
the price
Lawrence O on Sep 16, 2019
Trying this affordable option to improve my glue-ups for raised panel doors.
Gebhard M on Sep 15, 2019
Needed.
Harley F on Sep 15, 2019
Price
Bruce on Sep 15, 2019
Need clamps that keep a project, FLAT while gluing.
Rik W on Sep 15, 2019
I have had my large projects warp in the clamps as they dried, with this warp should not be a problem.
William W on Sep 15, 2019
I'm hoping to build a table in the near future. These look perfect for making the top.
Jonathan R on Sep 12, 2019
Making a table and needed this type of clamp.
Janet T on Sep 10, 2019
Price was right!!
J. Mark H on Sep 10, 2019
Great price
Joe D on Sep 8, 2019
Rockler equipment and supplies are among the best. I am starting to build some tables, needed good clamps.
Henry S on Sep 8, 2019
Needed two way clamping
Richard A on Sep 8, 2019
best reviews and most flexible for different widths.
donald P on Sep 8, 2019
Looks like a good idea
Paul F on Sep 6, 2019
Good Price
Allen C on Sep 4, 2019
looking to laminate a bunch of boards and this looks just right
Richard on Sep 4, 2019
My son wanted to make a table top comprised of 2x4's glued together and could not find the proper clamps to hold it together. This looks great for that purpose.
Steve on Sep 3, 2019
Had 4 sets of these for a long, long time. Started to make wider clamp boards for them and could find only 3 sets in my storage trunk. So, ordered this one so I could have two sizes of clamp widths ready for use.
Ronnie F on Sep 1, 2019
the video was convincing
Michael J on Apr 2, 2020
Video convinced me these would help to get flat tight tabletops
John L on Jan 14, 2020
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
BEST ANSWER: I would probably place a clamp every 18 inches. These will work - you make your own rails for these, so you can make the rails any length you need. You may find you need to add a couple of sheets of paper under the clamp rails near the center to keep pressure there (or not), since the wooden rails can bend slighly over longer distances when pressure is applied. Try it without the paper first, then use if needed.
How thick of material can these clamps accept?
Bobs5050 on Aug 3, 2015
BEST ANSWER: i used a 6 inch by 2 inch block 34 inches long. i drilled 3/4 inch holes every 1 and 1/2 inches. then i cut the block in half with a thin blade to make the clamp boards.do this twice and you have a nice set of them. make sure you use blue painters tape on the bottom of the block and place a small c-clamp in the middle and the glued item will come out as close to flat as it can be
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 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.
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.
Will they clamp 1/2" stock?
Hugh F on Dec 23, 2019
BEST ANSWER: Yup, and very well I might add, just make sure that you make the rails out of something substantial. I laminated Maple and Walnut for mine and I have a bunch of them, they're great !
Are the bars included? If not, are there plans included?
Michael B on Oct 22, 2019
BEST ANSWER: No you have to make the wooden support clamps. No plans included - but you could either create them via dado blades on your table saw or using a router. Using the router may work easier as you could use a wider piece of wood, then cut on the saw into 4-6 clamping pieces.
How are these different then clamping on cauls ?
Jane B on Dec 29, 2019
BEST ANSWER: These clamps clamp vertically like cauls, but also sideways, but:
1-setup is more involved, and make sure to use wax paper or painter tape to protect wood from glue.
2-spacing of the holes is critical. Follow instructions. I spaced them about 1 inch too far apart.
3-Minimum of three sets needed, middle and both ends. Large projects may need additional standard clamps
in addition to the three panel clamps but bowing upward is prevented buy these clamps.
4-Had to deepen several of the drilled valleys. They were too shallow and the clamps would slip out.
5-Cauls are clamped on the ends so middle of caul may bow away from surface verses these clamps
which are not only squeezing inward, but are also under tension (stretching) outward preventing bowing.
6-I would buy them again but my construction would change.
a. Instead of a 2x4, build an I-Beam out of plywood with the center flange doubled up.
b. drill holes to manufactures spec. then cut in half making sure the resulting valleys are deep enough.
c. I installed short legs on the bottom "caul" to make set up easier but this failed.
Can I order it already assembled?
Robin L on Apr 4, 2020
BEST ANSWER: The clamps themselves are fully assembled. You do have to supple the wood bars, drill them & cut them to finished size. Easy to do. Instructions are included with clamps.
Would these work for 10" x 16" cutting boards?
Jeff C on Dec 18, 2018
BEST ANSWER: Yes, they should work well for that.
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