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Fulton Marine Jack - Square Tube, Fixed Mount - 28" Lift - 5,000 lbs

Fulton Marine Jack - Square Tube, Fixed Mount - 28" Lift - 5,000 lbs

Item # HD50000101
Our Price: $251.54
Trailer Jack
Shipping Weight: 35 lbs
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This drop-leg jack with 5,000 lb. lift capacity puts in work! Large footplate is more stable compared to caster wheels. Cushioned handle adds comfort when cranking. 14" of screw travel plus 14" of drop leg travel. Bolt-on installation. Great Prices for the best trailer jack from Fulton. Fulton Marine Jack - Square Tube, Fixed Mount - 28" Lift - 5,000 lbs part number HD50000101 can be ordered online at or call 1-800-940-8924 for expert service.
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Fulton Trailer Jack - HD50000101

  • Boat Trailer
  • Car Hauler
  • Enclosed Trailer
  • Utility Trailer
  • 4001 - 5000 lbs
  • Sidewind Jack
  • Bolt-On
  • Leveling Jacks
  • Tongue Jacks
  • 28 Inch Lift
  • With Rectangle Foot
  • Steel
  • Fulton

This drop-leg jack with 5,000 lb. lift capacity puts in work! Large footplate is more stable compared to caster wheels. Cushioned handle adds comfort when cranking. 14" of screw travel plus 14" of drop leg travel. Bolt-on installation.


  • Drop leg marine jack is ideal for lifting heavy boats like pontoons and bowriders
    • Get the most leverage using the drop leg to double your overall extension
  • Sidewind handle prevents you from slaming your hand on winch posts, tool boxes, or other accessories giving you clearance issues
  • Cushioned grip is more comfortable to hold than rubber or plastic alternatives
  • Stands the test of time in saltwater environments
    • Zinc coating is about 30% more corrosion resistant than powder coated finish
  • Built-in grease zerk makes routine maintenance easy
    • Eliminates the need to remove and re-lubricate gears
    • Ensures the jack works properly for years to come
  • Installs in minutes
    • Bolt-on design
    • Includes sturdy footplate, bracket, and hardware for 4", 5", and 6" tall trailer frames
  • Durable, heavy-gauge steel construction


  • Application: trailer frames up to 3" wide x 6" tall
  • Bracket height:
    • 6-1/2" Retracted
    • 20-1/2" Extended
  • Total lift: 28"
    • Screw travel: 14"
    • Drop leg extension: 14" in 3-1/2" increments
  • Footplate: 6" x 8"
  • Lift capacity: 5,000 lbs
  • Clearance: 18"
  • Tubing width: 2-1/2"
  • Mounting bracket width from center of one hole to center of the other hole: 4"
  • Limited 5-year warranty

How to Determine the Lift Capacity You Need in a Jack

A trailer jack is designed to lift the tongue of your trailer so you can connect the trailer coupler to your hitch ball. To do this, you'll need a jack with a lift capacity high enough to handle your trailer's tongue weight.

Tongue weight is the amount of weight that your trailer applies to the back of your tow vehicle. Typically, your tongue weight should be 10-15% of your total trailer weight (trailer + cargo). In other words, a 10,000-lb trailer would have a tongue weight between 1,000 lbs and 1,500 lbs. For a trailer this size, you would need a jack with a lift capacity of at least 1,500 lbs.

It's okay to have a jack with a weight rating that is higher than your trailer's tongue weight. In fact, a jack with a higher lift capacity should operate more efficiently, allowing you to spend less time cranking and more time camping.

Trailer and Camper Jack Lift

Every jack offers a certain amount of lift or travel. Screw travel is the distance the jack extends when you crank it (or toggle it to "extend" on an electric model). Some jacks include a drop leg for extra adjustability. On these jacks, you'll see the maximum extension of the drop leg listed in the specs as well. Adding the screw travel and drop leg travel together will give you the total lift. The total lift listed above can help you determine how high this jack will be able to raise your trailer.

HD50000101 Fulton Marine Jack - 5K - Square Tube, Fixed Mount

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Customer Satisfaction Score:

Customer Reviews

Fulton Marine Jack - Square Tube, Fixed Mount - 28" Lift - 5,000 lbs - HD50000101

Average Customer Rating:  4.8 out of 5 stars   (271 Customer Reviews)

This drop-leg jack with 5,000 lb. lift capacity puts in work! Large footplate is more stable compared to caster wheels. Cushioned handle adds comfort when cranking. 14" of screw travel plus 14" of drop leg travel. Bolt-on installation.


This product has proven durable and easy to use. Installation with simple and straight forward. If you're looking for a robustly built, long lasting Jack for your boat this would be THE product you're looking for. We previously purchased other jacks that did not last, became hard to crank, and ultimately failed. I'm glad I purchased this.



This Jack Still functions smoothly and is easy to use.


Had a Fulton marine jack on my trailer but the yard where I keep it moved trailers without properly raising the jack. Destroyed the crank mechanism and bracket. Purchased this heavier duty jack (boat is 4,500 lbs) and it installed easily and works smoothly. Quick shipment from etrailer.



Still working well and this heavy duty jack was the right one for my size trailer.


Very heavy duty jack!!! Replaced a topwind a-frame jack with this one so I wouldn’t have to worry about any dents in my tailgate. I mounted in-wards so you can still raise/lower the Jack from the drivers side. etrailer got this to me in 2 days, great company!!!


great communication, arrived on time. Most other vendors out of stock


Excellent product. No problems.


Fast shipping, good price love the product, thank you so much!


The product is exactly what I needed for my trailer. Also, the service/communication with etrailer was excellent. I emailed about the shipping state and got numerous emails back with that information plus much more.

This was a GREAT experience.

Billy C.


I currently have the Fulton 3500 lb capacity Magnum Series trailer jack. Would the 5,000 cap jack replace my jack? The trailer is 3 x 4 where the current jack is mounted.Also, are there any additional items I need to purchase to mount the new jack?Thanks for any info!Billy

Patrick B.


The Fulton Marine Jack, part HD50000101, comes with three sets of U-bolts to fit different trailer frame sizes. Obviously it is not an exact replacement, the difference in weight capacity, but it will fit a 3x4 inch trailer frame. The U-bolts are designed to fit, 4, 5 and 6 inch tall frames, so you will need the smallest set.

Preston S.


It works perfectly. Easy to use and very well built.


Excellent product! Installation was a breeze, and it looks and works like a charm.


Top notch trailer jack. Easy to use. It replaced a welded on trailer jack on our 16' trailer that we use to haul drums of maple syrup to market.



After a year of use its still the best trailer jack weve ever had. Big thumbs up!


Very good quality. Easy to install



I tow my boat with a Jeep Wrangler, Sprinter Class C RV, and a 4runner and this jack makes it very easy to go from the different ball heights.


Works great. Easy installation!


This jack is awesome. I have a large equipment trailer. Super easy to install and works great.

The rapid shipping and personal follow up were a welcomed surprise.

I will always consider etrailer for my future needs. Great customer service.

David M.


Excellent product. I pull a trailer every day. This jack is absolutely great.


After going through three trailer jacks in almost as many years, I tried this Fulton jack. It has been great! Solid, dependable, works like a champ every time. I highly recommend it.

Jean M.


A year later this product is still great!


I bought this jack last year to supplement my jack with the wheel on it. To get my boat in the garage I have to use a 3 inch drop and since the driveway slopes downward I only have about 8 inches of clearance to the ground. This jack lets me get the boat all the way in the garage AND can still get the trailer on and off the hitch.


I bought new tires and galvanized rims for my snow mobile trailer and boat trailer.
After one year I am still happy with my purchase. I also bought the Fulton 5K marine jack
And love it. I haven't had any trouble at all with tires, rims, or Jack.
Service was great too!



this jack is heavy duty and has a good outside coating that should last for years. I have it mounted on a trailer with the top of the draw bar around 19" off the ground . If the trailer has a low draw bar you may need to mount this higher for ground clearance. Great product ,very strong , easy to crank up loaded and the quick drop foot is much faster then cranking .


Quality product. Built extremely solid, excellent welds, smooth crank, mounting plate holes are deberred, in fact I could not find a burr anywhere. I purchased 2 of these for a project and found they have great adjustability. The mounting "U" bolts supplied are for 3 different size trailer tongues and are 1/2" dia. These lifts certainly appear to be able to handle their 5000# rating.
Etrailer shipped the order the next day. The product was well protected, Three layers of cardboard. The order arrived in excellent condition.


There is nothing wrong with the jack itself. Very easy to lift the trailer tong and really smooth compare to old jack. I would give it 5 stars. However I could not mount it because U-bolts provided are about 1/2" short. And it is OK too, things happen. The problem is there is no any information whatsoever about mounting dimensions or bolt sizes and specifications. For that matter installation instructions enclosed are for the different type of jack.See attached photos. Now I have to play guessing games is it 7/16" diameter or else? Is it 4" or 4 1/16" wide, what kind of thread? In other words instead of what would be a simple procedure for tightening 4 nuts I need to spend time and more money to finish installation. In fact back in April I asked these questions and never got any clear and Intelligence answer from etrailer "experts". Why is it difficult to provide this information?


Great jack for my boat trailer! Very well built and beefy! Much better than many on the market. The drop down feature is very handy. Highly recommended...


I received the package this afternoon and installed it on my boat trailer. I have a heavy aluminum river boat with some t-1 plate on the bottom. I needed a jack stand that was stable when the boat is on the trailer. This product works well and I will be recommending it to my fellow guides here on the Salmon River here in Idaho.


Product as advertised, very sturdy and easy to mount to trailer with all the different U-bolts supplied with the jack. You Just have to pick the best U-bolt out of the box, when mounting to your trailer. I would purchase this product again.


This jack is heavy duty and was easy to install. I have a saltwater boat that we trailer to and from the bay each time we go fishing and the salt is tough on gear. So far the unit has lasted a full year without significant rust accumulation or malfunction. 2 years seems to be the typical life of most components, however, so next year will be the test.


Great jack. Sturdy. Easy to use. Smooth cranking. Etrailer comes through every time I order a product.


This is the second time I have bought this.
first time was for my 20’ snow mobile trailer.
It has performed flawlessly for the last 4 years.

So it was time to buy a new jack for my boat trailer.
20’ Mako center console. It’s an over kill, but it is rock solid and know problem lifting the hitch
Up to get on a lifted Ram 1500

Highly recommend


I call etrailer At 800-298-8924 & got my order taken by a real Person that was Customer Friendly. I received My order in a timely manner also.
I would recommend any One looking for
They have all kind of Brands to choose from.
It was a replacement Jack on a scissor lift trailer.
it is a excellent product.
It also was a excellent Price.
When I need something else etrailer will be the first place I look for it.
Thanks Bill Excellent Job.

Show More Reviews

See what our Experts say about this Fulton Trailer Jack

  • Is There a Replacement Handle for the HD50000101 Fulton Square Jack
    I checked and unfortunately there is no replacement handle for the square tube Fulton Marine Jack # HD50000101. I realize this is not the news you are looking for, but the only option if your handle is broken is to replace the jack with a new one.
    view full answer...
  • Bolt Hole Dimensions of the Fulton Jack # HD50000101
    I went out into our warehouse to get the dimensions of the # HD50000101 you requested. I attached a couple pictures that detail all of the dimensions. Basically the holes are 1/2 inch in diameter, the closer holes are 1 inch apart on center and the bigger distance between the upper and lower holes are 2-5/8 inches, and the distance from left to right is 4 inches.
    view full answer...
    Image 1 for Image 2 for
  • Replacement Fulton Trailer Jack for Sled Bed trailer
    We have the Fulton Marine Jack # HD50000101 which will fit trailer's with a frame up to 6 inches.
    view full answer...
  • Availability of Side Frame Mount Jack for Aluminum Trailer With 3 x 6 Frame
    We do have one jack available that will fit a 6" frame like yours, that is the Fulton Marine Jack - Square Tube, Fixed Mount - 28" Lift - 5,000 lbs # HD50000101. The largest set of U-bolts that comes with this jack measures 6-1/8" so it will be able to fit around your 6" frame. This jack has a lift capacity of 5,000 lbs and includes a sturdy footplate. It offers 14" of screw travel along with a 14" drop leg extension for a total lift of 28". It also features the Z-Max 600 zinc finish...
    view full answer...
  • Is 5,000 lb Fulton Marine Jack Easier to Use Than 2,500 lb Fulton Marine Jack
    That's a really good question, and the answer is yes, the 5,000 lb capacity Fulton Marine Jack # HD50000101 will be easier to jack up than the 2,500 lb etrailer Marine Jack # MJSQ-2500B. The gears are in fact different, with the smaller 2,500 capacity jack having gears that are both smaller in diameter and less teeth. So while both of these jacks are high-quality with good salt spray rating, and fit trailer frames up to 3" wide x 5" tall, if you are looking for the jack that is going to...
    view full answer...
  • Mounting Bracket Bolt Hole Dimensions for the Fulton Marine Jack part # HD50000101
    The Fulton Marine Jack, part # HD50000101, comes with three sets of U-bolts to fit different trailer frame sizes. To see if it would bolt right up to your trailer through the mounting bracket you would need to compare the dimensions in the picture I attached to what you have on your trailer.
    view full answer...
    Image 1 for
  • Mounting Plate Thickness of Fulton Jack HD50000101
    The Fulton Marine Jack # HD50000101 mounting plate has a 1/4" thickness.
    view full answer...
  • Distance from Bottom of Mounting Plate to Foot on Fulton Marine Jack
    I measured the distance from the bottom of the mounting plate to the bottom of the foot on the Fulton Marine Jack # HD50000101 and found the distance to be approximately 3-1/4". This jack mounts comes with three sets of U-bolts to mount to 4", 5" or 6" square tube trailer frames, has a 5,000 lb capacity and comes with a 5-year warranty. I have added a link to a video review of this jack for you to take a look at.
    view full answer...
  • Solution for U-Bolts Being to Long to Install Trailer Jack
    We don't have different size U-bolts available but you may be able to find them elsewhere either locally or online. Other option would be to use several washers to take up the extra room. This may not be the prettiest solution but it may be the easiest.
    view full answer...
  • Best Trailer Jack for a Boat Trailer with 3-1/2 Inch Wide By 5-1/2 Inch Tall I-Beam Trailer Frame
    I do have an option but what you are wanting is just simply not possible due to the dimensions of your aluminum I-beam frame. The only marine grade bolt-on trailer jack we have that will work for you is the Fulton Marine Jack part # HD50000101. The Fulton Marine Jack offers a 5,000 lb capacity and up to 14" of lift. The bracket used to secure the jack to the frame is positioned near the bottom so you should not have any issues with bottoming out. The zmax finish will ensure you don't run...
    view full answer...
  • Attaching Fulton Marine Jack # HD50000101 to Trailer with 5 inch by 5 inch Frame
    Unless you have a way to source larger U-bolts the best way to install the Fulton Marine Jack # HD50000101 on a frame size of 5 inch by 5 inch is to weld the jack to the trailer frame. I know you said you didn't want to weld it but if you can find a welder local to you they'd have it installed very quickly as this would be a super easy job for them. Also we do not offer any jacks that will bolt to a 5 by 5 inch frame.
    view full answer...
  • Will Fulton Trailer Jack # HD50000101 Fit 4 inch Square Tubing on Trailer Jack
    The Fulton trailer jack part # HD50000101 that you referenced comes with three sets of U-bolts. A set for a 4 inch square tube like what you have, a 5 inch square tube, and a 6 inch. So this will fit and work well for you.
    view full answer...
  • Recommended Trailer Jack For Aluminum Trailer With 5-1/2 Inch I-Beam Frame
    We do not offer a jack that swings up and will work with the I-beam aluminum trailer you said you have but we do have a fixed trailer jack that will work for you. I recommend part # HD50000101. This is a fixed mount square tube jack with a 5,000-lb capacity. This is a U-bolt mounted jack. I went to the warehouse and took some measurements to make sure it would be a fit for your trailer frame. The U-bolt mounting plate measures 8-inches tall and 5-inches wide and the largest U-bolt included...
    view full answer...
    Image 1 for
  • Frame Jack for Cargo Trailer That Fits Up To 6 Frame and Excellent Ground Clearance
    I reviewed some choices which would meet your individual needs and were all non-electric, drop leg, and excellent ground clearance. There were a number of similar jacks, but only one that would mount to your 6” trailer frame. I ordered one from the warehouse so I could check it out personally and measure it. I have attached a couple of pictures of the mounting brackets that I took today. You will need the Fulton Marine # HD50000101 bolt on sidewinder jack with a drop leg. If you are...
    view full answer...
    Image 1 for Image 2 for
  • Fulton Marine Jack # HD50000101 Inner Tube Hole Spacing
    I went out to our warehouse and pulled off the inner tube/base of the Fulton Marine Jack # HD50000101 and measured from the top of the base out to each of the holes. The diagram I have below shows the measurement from the base to the center of each hole.
    view full answer...
    Image 1 for
  • Recommended Trailer Jack That Allows Tailgate To Fully Open
    Unfortunately we do not have a jack that mounts in the A-frame location on your trailer that would allow you to be able to fully open your tailgate but I may have a solution for you. I recommend a jack like part # HD50000101. This is a sidemount square leg jack that has a weight capacity of 5,000-lbs. This jack attaches to the frame of your trailer and comes with 3 sets of different size U-bolts that can be used on different sized trailer frames. You can mount this on the trailer frame...
    view full answer...
  • Could Fulton Marine Jack # PSEA20000103 Fit 3 inch Trailer Frame
    You could install the Fulton Marine Jack # HD50000101 on a trailer frame that measures 3 inches by 3 inches but you'd have to use 1 inch spacers as the smallest set of u-bolts that comes with this kit is for a 4 inch frame dimension.
    view full answer...
  • Replacement 5K Trailer Jack Needed with Bolt-On Installation
    We do have a very similar 5K trailer jack like the Pro Series # PS1400800383 but that is a bolt-on installation instead of a weld-on. The Fulton Marine Jack # HD50000101 is also rated for 5K and it has a lift of 14" as opposed to 15" like the Pro Series jack has. This has a Zmax 600 finish for superior corrosion resistance and comes with a limited 5-year warranty. I have attached some review videos that you can check out as well.
    view full answer...
  • Replacement Gear Kit for a Fulton 5,000 Pound Jack
    If your Fulton jack is a square tube 5,000 pound jack then the proper gears are # BD500106. If you have a different jack I would need to know the approximate age, shape, and if it is a top or side wind.
    view full answer...
  • Replacement Drop Leg for Fulton 5,000 lb Square Jack
    The part you're looking for is the same as part # BD500270 - Bulldog Square, 18" Tall Drop-Leg Kit with Pin - 8,000 lbs. It serves as a direct replacement for the original drop leg on the Fulton 5,000 lb Jack # HD50000101.
    view full answer...
  • Recommended Marine Swivel Jack With 10" Of Lift Rated For 3,500 Lbs.
    I do have a few options for you to consider however, there is no jack that matches the exact description you have provided. The highest rated weight capacity we have for a bolt-on swivel jack is 2,000 lbs. For this, I recommend the Fulton F2 Swing-Up Jack w/ Pivoting Footplate part # F1413230134 as this will match all but one of your needs mentioned. It has a maximum lift height of 10", features a swivel design for easy storage, and bolts onto the frame without the need for welding. Most...
    view full answer...
  • What is the Difference Between the Fulton HD50000101 and the etrailer MJSQ-2500B?
    Though these two jacks do look to be nearly identical, there is one fairly large difference, and one lesser of one as well. The large one being the weight capacities they can handle. The # HD50000101 is rated up to 5,000 pounds, whereas the # MJSQ-2500B is rated up to 2,500 pounds. So it is mostly the internals that are different, which is why they look like each other. The smaller difference is how the cranks attach to the jack. The # HD50000101 has a gear box, for the lack of a better...
    view full answer...
  • Recommended 5000lb Trailer Jack Rated For Use In Salt Water
    I have a different option for you, but the Trailer Valet JXS Jack # TV64FR is not recommended for use in salt water per my contact at Trailer Valet. Instead you will want to go with the Fulton Marine Jack - Square Tube, Fixed Mount - 28" Lift - 5,000 lbs # HD50000101 which has the same 5000lb rating but has a 600 Hour Salt Spray Rating so it will hold up perfectly in marine applications. This jack fits trailer frames that are 3" wide x 5" tall which is virtually the same as the Trailer...
    view full answer...
  • Recommended Side Frame Mount 5K Trailer Jack for 7200-lb Trailer
    I can't recommend modifying either your A-frame trailer's jack mount or the jack itself to give you the tailgate clearance you need since that would void their warranties. However there is an easier option. You can install a side-frame-mount jack like the bolt-on sidewind 5K Fulton # HD50000101. This jack includes a foot plate and it also has a drop leg to provide 14-inches of instant extension. It fits frames up to 3-inches wide and 5-inches tall.
    view full answer...

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Info for this part was:

Employee Lindsey S
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Employee Alexander C
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