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Atlas IV Double-Acting Hydraulic Trailer Jack - 26" Lift - 10,000 lbs - Direct Weld
(30 reviews)
Price: $522.50
In Stock
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Atlas IV Double-Acting Hydraulic Trailer Jack - 26" Lift - 10,000 lbs - Direct Weld
Part Number: ST23FR
In Stock
$522.50
Retail:$675.00
You Save: $152.50
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- All Info
- Reviews (30)
- Q & A (0)
- Photos
Stillwell Trailer Jack - ST23FR
- Dump Trailer
- Enclosed Trailer
- 5th Wheel Trailer
- Gooseneck Trailer
- 9001 - 10000 lbs
- Hydraulic Jack
- Weld-On
- Side-Mount Jacks
- With Rectangle Foot
- 26 Inch Lift
- Stillwell
Upgrade a heavy work or dump trailer from manual cranking with 10,000-lb capacity and 26" of lift. This double-acting Atlas uses power-up/power-down hydraulics and welds directly to the frame. Compatible HPU required.
Highlights
- Upgrade Heavy Trailers to Hydraulic: 10,000-lb capacity and 26" lift replace repeated manual cranking.
- Double-Acting Control: Hydraulic pressure powers both extension and retraction for controlled operation.
- Requires Power-Up/Power-Down Hydraulics: Pair with a compatible HPU; pump, hoses, and fittings are sold separately.
- Direct-Weld Installation: 4" outer tube welds directly to the trailer for a permanent custom installation.
- Built for Daily Work: Glide bearings reduce tube contact to help limit wear over repeated cycles.
- Plan for Backup Operation: No built-in manual override; emergency operation depends on the HPU you pair with it.
Features to Know About
Trade the Hand Crank for Hydraulic Power
Heavy dump trailers, equipment haulers, and work trailers can make a manual jack feel like a workout every time you hitch or unhitch. The Atlas IV gives you 10,000 lbs of lifting capacity and 26" of lift, making repeated hookups easier when you're dealing with a heavy tongue or using the trailer throughout the day. Because it's double acting, hydraulic pressure powers the jack in both directions. You get powered extension to lift the trailer and powered retraction when it's time to get the jack back out of the way.
Pair It With Power-Up/Power-Down Hydraulics
This Atlas is the jack itself, not a self-contained hydraulic system. It requires a compatible power-up/power-down HPU, along with the hoses and fittings needed for your setup. That makes it a strong option when your trailer already has compatible hydraulics or you're building a system around a separate pump. The two #6 SAE ORB hydraulic ports handle extension and retraction. The jack itself does not have a built-in manual override, so emergency operation will depend on the capabilities of the HPU you pair with it.
If your dump trailer already has a compatible power-up/power-down hydraulic system, you can add a compatible Stillwell connection kit with the selector valve, hoses, and fittings needed to let the jack share your trailer's existing hydraulic system. If you're building a separate hydraulic setup, we also carry a Stillwell hydraulic pump for powering the Atlas.
Choose Your Mounting Height and Weld It In
This OEM-style Atlas uses its 4" outer tube as the mounting surface, letting a fabricator weld the jack directly to the trailer frame at the height that works for the application. You should consider the jack's retracted and extended heights when choosing that mounting point so you have the clearance and reach your trailer needs. Stillwell specifies that welding should be performed by a certified AWS welder following the standards in its installation instructions.
Once it's installed, the Atlas is built for repeated heavy use. Glide bearings help prevent contact between the inner and outer tubes, while Stillwell's seal design helps improve cycle life and load holding. A zinc-plated swivel foot and corrosion-protected steel construction add protection for the kind of work environment this jack is made for.
Specs
Capacity and Lift:
- Lift capacity: 10,000 lbs
- Lift: 26"
Hydraulic System:
- Operation: double acting
- Hydraulic operation: power up/power down
- Hydraulic ports: (2) #6 SAE ORB female
- Maximum pump pressure: 3,200 psi
- Compatible hydraulic power unit required; sold separately
- Hoses and fittings: sold separately
- Manual override: depends on hydraulic power unit used
Jack Dimensions:
- Retracted height: 35-13/16"
- Extended height: 61-3/8"
- Outer tube: 4" x 4"
- Footplate: 11" long x 8" wide
Mounting:
- Mount type: direct weld
- Mounting surface: 4" outer tube
- Welding: certified AWS welder per manufacturer instructions
Warranty:
- 2-year limited warranty
SJ001BXOEM4 Stillwell Atlas IV 10K Hydraulic Trailer Jack, Weld On
Installation Details
Customer Satisfaction Score:
99% were satisfied with this product
1% of customers were not satisfied
- Alternate product found
Ratings & Reviews
4.5
30 reviews
by:
Robert
03/19/2026
by:
Juan
10/09/2025
by:
Daniel
06/21/2026
I didn’t know the bolt holes were not going to line up with my trailer holes….. other than that it was fine to install
by:
Robert
10/07/2026
I can’t believe that I waited this long before switching the hand crank to the hydraulic system. All of my buddies are like I need one of those. I had no choice mine broke and my neighbor did his and yes awesome invention.
by:
Mike
09/21/2026
Jack works exclent. Installed with minimal problems had to redrill the mounting holes but no problem
by:
Leroy
08/23/2026
Product is good and works well. No instructions provided for the diverter valve. A quick phone call and they emailed me those instructions.
by:
Capps Install
05/10/2026
The most difficult part was removing the old mechanical welded in jack. Wound up using a combo of a cutting wheel and a plasma torch. One the new jack was in position, I welded it complete, painted the area, hole sawed two 1" holes in the pump storage box, installed grommets and completed the plumbing. Bleed the jack per the instructions I found online and it worked like a champ afterwards. My only complaint would be that there were no instructions what so ever but was able to locate them online with Stillwell, the manufacturer.
by:
Robert
04/16/2026
This rating is based on the product description. I can’t install it due to some extremely short hoses. While shopping I assumed the “39 in.” vs the 48 in. meant the hose length and it does. For the long hose anyhow. The short hoses are so short they limit the positioning of the transfer switch. If I put the switch close enough to use the short hoses, then the long hoses are too short. None of this hose length is shown in the product details. Now I have to get custom hoses made. I would seriously consider ordering without hoses as these hoses are stiff and positioning and placement make it difficult without custom sizing.
by:
Jacob
08/01/2026
Have not installed it yet but appears to be very heavy duty built. Cant wait to use it.
by:
Jimmy
01/18/2026
Great place to buy your equipment needs, thanks
by:
Sumner
06/19/2025
Very heavy duty a lot more than I expected
by:
sean m
04/30/2026
product it self is good, jack is quality, controls and hoses are high quality the dumb part is no instructions or labeling on the control valve- so its trial and error for hose installation. jack mount is odd pattern so you will be fabricating in some way to mount it-
by:
James
11/28/2025
Packaging was all ripped open haven’t installed yet
by:
Timothy
11/10/2025
Works good
by:
David
12/13/2025
Jack extremes no problem but does not retract up. Sellers has no clear instruction on installation.
Nick S.
12/15/2025
I am sorry to hear you are having trouble getting the Atlas to retract. We will reach out shortly and help troubleshoot through this.
by:
Jeffery
10/07/2025
Upset that I had to pay an additional 250.00 for two longer hoses and one shorter hose. The two short hoses from the pump to the transfer valve should have been the same size. One was 6 inches longer.
The long hoses from the jack are way to short.
Also the packaging was terrible. Box was all ripped up and taped. Lots of scratches.
The long hoses from the jack are way to short.
Also the packaging was terrible. Box was all ripped up and taped. Lots of scratches.
by:
Arden Equipment
04/15/2026
by:
Rick
01/14/2026
by:
Edgar S
03/01/2026
by:
Erik
06/08/2026
by:
Robert
11/26/2025
by:
Ralph
05/08/2025
by:
Keith
05/27/2025
by:
Marie
01/30/2026
by:
Tom
07/14/2026
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See what our Experts say about this Stillwell Trailer Jack
- Can Stand Alone Single Acting Hydraulic Pump Be Used For Stillwell Hydraulic Trailer Jack?Hey Sean, yes you can definitely use a stand alone system like a single-acting hydraulic pump to power a hydraulic trailer jack like the single action Stillwell lineup we just started carrying. For the Stillwell Atlas IV 10K Hydraulic Trailer Jack w/ Connection Kit for Dump Trailers - 39" # ST67VR you were looking at, you can use 3,000-psi Hydraulic Pump for Stillwell Jacks # ST93FR. This has an inlet line port, and an outlet line port for the jack. It works by supplying pressure to raise...
view full answer... - Can the Atlas IV Hydraulic Trailer Jack Be Used on a Gooseneck Trailer? Yes, you can Kirk! The Atlas IV Hydraulic Trailer Jack - Direct Weld - 10K item # ST23FR can indeed be used on a gooseneck trailer. It has a 10,000 lbs capacity and can be welded directly to it. If you're looking for a bolt on one, I recommend the Atlas IV Single-Acting 10K Hydraulic Trailer Jack w/ Connection Kit for Dump Trailer -item # ST67VR. Both of these jacks work with the 3,000-psi Hydraulic Pump for Stillwell Jacks item # ST93FR. What kind of gooseneck trailer do you have?
view full answer... - How Does The Atlas IV Hydraulic Trailer Jack ST23FR Retract Completely?Hey Jerry, thanks for reaching out. The Atlas IV Hydraulic Trailer Jack # ST23FR is a single-acting hydraulic jack, so hydraulic pressure is only used to extend the cylinder. Once the trailer is coupled and the tongue weight is off the jack, the hydraulic pressure is released and compressed air is applied to the opposite side of the piston to fully retract the jack. It doesn't rely on springs or the trailer's weight to pull the cylinder back in. So even after the foot lifts off the ground...
view full answer... - What is Width Dimensions of Atlas IV Hydraulic Trailer Jack # ST23FRHey Jay, welcome back! So the overall width of the outer leg of the Atlas IV Hydraulic Trailer Jack # ST23FR is 4 inches. It is actually 4 inches by 4 inches. The foot plate is 8 inch by 11 inch. What are you planning on installing this on?
view full answer... - What Is The Total Travel Of ST23FRHey Mcdanielson, The total travel, or stroke length, of this jack is going to be 26" which is great for various types of trailers. Was there a certain length or distance you were needing for your setup?
view full answer... - Is There a Hardware Kit for the Bolt On Atlas IV Double-Acting 10k Hydraulic Trailer JackHey Luis, welcome back! The Atlas IV Double-Acting Hydraulic Trailer Jack item # ST73FR does not have a specific hardware kit available for it. You'll need a total of eight Grade 8, 1/2" diameter bolts to complete the installation. The length of the bolts is going to depend on how thick your trailer's frame is so you'll need to measure that and add 3/8" for the bracket thickness. 1/2-20 fine thread grade 8 bolts need 80 – 90 ft-lbs of torque. I attached a dimensional diagram with the...
view full answer... - Is the Atlas IV Hydraulic Trailer Jack ST23FR a Single-Acting Jack?It sure is Chandler. The Atlas IV Hydraulic Trailer Jack item # ST23FR is indeed a single-acting jack. It has a 10,000 lbs capacity, 26" of total travel, and can be welded directly to your trailer. We also have the Atlas IV Single-Acting Hydraulic Trailer Jack item # ST55FR if you would prefer a bolt on installation along with a finish. What kind of trailer do you have? You can add this information, along with any other questions you have, where it says Add Comment.
view full answer... - What Is The Total Length Of The Atlas IV Hydraulic Trailer Jack ST23FR?Hey Albert, thanks for reaching out. I just went out to our warehouse and measured the Atlas IV Hydraulic Trailer Jack # ST23FR. Overall it measures 34-1/2" long including the foot. The Tube itself is 32" long. I edited a picture to help illustrate. Hope this helps! What kind of trailer will it be going on?
view full answer...
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Info for this part was:
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Expert Research:
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Video Edited:
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Installed by:
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Lazer S.
5/5/2026
Sorry about the lack of instructions, Sean. I will see if I can get those added to our site so they are available to everyone. Surprised they weren't included. What did you install this on?