Dexter Trailer Axle with Idler Hubs - 4 on 4 Bolt Pattern - 72" Long - 2,000 lbs

Dexter Trailer Axle with Idler Hubs - 4 on 4 Bolt Pattern - 72" Long - 2,000 lbs

Item # 20440I-ST-72

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Trailer Axles 20440I-ST-72 - 4 on 4 - Dexter Axle
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Trailer axle measures 72" from hub face to hub face and 58" from spring center to spring center. Includes idler hubs - with bearings, races, and seals - for 10" to 13" wheels. Lowest Prices for the best trailer axles from Dexter Axle. Dexter Trailer Axle with Idler Hubs - 4 on 4 Bolt Pattern - 72" Long - 2,000 lbs part number 20440I-ST-72 can be ordered online at or call 800-298-8924 for expert service.
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  • Reviews (7)
  • Q & A (9)
  • Videos (1)
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Dexter Axle Trailer Axles - 20440I-ST-72

  • 2000 lbs
  • 72 Inch Long
  • Leaf Spring Suspension
  • Idler Hubs
  • 4 on 4
  • 58 Inch
  • Dexter Axle
  • Standard Spindles

Trailer axle measures 72" from hub face to hub face and 58" from spring center to spring center. Includes idler hubs - with bearings, races, and seals - for 10" to 13" wheels.


  • Axle beam acts as part of your trailer's suspension system
    • Replace an axle on your trailer
    • Fabricate a suspension to fit your application
  • High-strength steel construction
  • Bend in axle creates zero camber angle for even road-to-tread contact across the width of your trailer's tires
    • Best for straight-line acceleration and steady, controlled towing
  • Underslung design - spring seats welded to underside of axle for mounting leaf springs
    • Low ride height makes it easier to load and unload your trailer
  • Straight spindle - no drop
    • Standard grease application
  • Spring seats and spindles are welded on
  • Cast iron idler hubs are sturdy and durable
    • Bearings, races, seals, grease caps, wheel studs, lug nuts, and marine-grade wheel bearing grease included
  • Limited 2-year warranty


  • Weight capacity: 2,000 lbs
  • Hub-face-to-hub-face length: 72"
  • Spring-center-to-spring-center length: 58"
  • Hub bolt pattern: 4 on 4"
  • Tubing outer diameter: 1-3/4"
  • Spindle size: 1-1/16"
  • Wheel stud diameter: 1/2"
  • Wheel size: 10" - 13"
  • Grease cap outer diameter: 1.986"

Bearing, Race, and Seal Information

  • Bearings
    • Inner bearing: L44649
    • Outer bearing: L44649
  • Races
    • Inner race: L44610
    • Outer race: L44610
  • Seal: 10-9
    • Inner diameter: 1.50"
    • Outer diameter: 1.987"

Axle Dimensions

Hub Face and Spring Center Measurements on Standard Trailer Axle

There are multiple ways to measure the length of an axle beam, but the hub-face-to-hub-face and spring-center-to-spring-center lengths are the most accurate. Hub face (A) refers to the length of the axle measured from the base of one wheel stud to the base of the wheel stud on the opposite side of the axle.

The spring center (B) is the approximate width of your trailer. It is measured from the center of the spring seat on one side of the axle to the center of the seat on the other. This axle beam comes with the spring seats welded on.

If you are replacing your trailer's axle, you should be able to figure out which type you need by determining your trailer's capacity, the bolt pattern of your wheels, the brake type and the aforementioned lengths.

Dexter Axles

Dexter axles are made of high-strength steel and come with spindles and spring seats welded on. The spring seats are attached to the underside of the axle so that the leaf springs (sold separately) can mount beneath the axle. The result of this underslung design is a trailer that rides a bit lower for quick and easy loading and unloading.

Each axle is manufactured to create a certain camber angle. This ensures that the angle of the wheels is correct for your towing needs. Because the primary concern when towing is maintaining controlled, in-line movement, each axle is made so that your trailer's tires will run along the pavement evenly, with contact across the width of the tread. The result is excellent straight-line acceleration for steady, in-line tracking. You might notice the bend near the center of the axle; this is what ensures the proper camber angle. Having the center ride a bit higher and the sides of the axle bent lower allows the axle to give just enough to compensate for the load.

Determining the Bolt Pattern

The first number in the bolt pattern is the number of bolt holes. The second number denotes the diameter, in inches, of the circle on which the bolt holes sit.

Bolt Pattern - Even

On wheels with an even number of bolt holes, measure from the center of one bolt hole to the center of the hole directly across from it. (Example: 8 on 6-1/2 means 8 bolt holes with 6-1/2" from the center of one hole to the center of another on the opposite side.)

Bolt Pattern - Odd

To determine the bolt-circle diameter on wheels with an odd number of bolt holes, measure from the center of any bolt hole to the point halfway between the two bolt holes directly across from the first. (Example: 5 on 4-1/2 means 5 bolt holes with 4-1/2" measured to a point halfway between the opposite bolt holes.)

Bolt Pattern - Side

Measuring the distance (D) from the center of one bolt hole on the wheel to the center of a bolt hole right next to it can also help to determine the bolt pattern.

  • If D = 2-5/8", then the bolt pattern is 5 on 4-1/2"
  • If D = 2-3/4", then the bolt pattern is 5 on 4-3/4"
  • If D = 3", then the bolt pattern is 5 on 5"
  • If D = 3-1/4", then the bolt pattern is 5 on 5-1/2"

T20BTR-7258 Dexter Replacement Axle Beam - 72" Hub Face - 58" Spring Center - 2,000 lbs

8-91-05UC1 Trailer Hub Assembly for 2,000-lb Axles - 4 on 4 - L44649

L11404 LubriMatic Marine Trailer Wheel Bearing Grease - 16 oz. Can

Video of Dexter Trailer Axle with Idler Hubs - 4 on 4 Bolt Pattern - 72" Long - 2,000 lbs

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Dexter Axle Trailer Axles - Leaf Spring Suspension - 20440I-ST-72 Review

Today we're going to review part number 20440I-ST-72. This is the Dexter Trailer Axle with the standard spindles, comes with the idler hubs with the four on four inches bolt pattern. This axle is 72 inches long and has a 2,000 pound weight capacity. Now this part will include the axle here, the two idler hubs, comes with the inner and outer bearings, now the bearing races are included, they are pre-installed in the hubs already, comes with the grease seals, the dust caps, half inch lug nuts, and a tub of the marine grade wheel bearing grease. Now this axle beam will act as part of your trailer suspension system, you can use it to replace an axle on your trailer or you can also use it to fabricate a suspension to fit your specific application. It is constructed of a high strength steel. Also if you'll notice this is an underslung design and by that, that means the spring seats right here, there's one here, one back here. They're welded to the underside of the axle and this is for mounting leaf springs to.

This will give you a low ride height which makes it easier to load and unload your trailer. You'll also notice it does use straight spindles, there's no drop to them. It's a standard grease application spindle, it does include the castle nut and the cotter pin. Now when we do ship them, we do protect the ends there from any damage. Basically, the machine finish of the spindle part right here will be coated with grease and then bubble wrap around it and then they use these very heavy corrugated tubes that will just slide over it to protect it and then they're wrapped again to protect it from any damage during shipping. Now the spring seats and the spindles are already welded onto the axle. Now on the trailer axles, you might notice, it might be hard to see in this video, but the center will actually be higher, it does bend at the center, the axle goes up and then down again. This bend will create a zero camber angle to give you even road to tread contact across the width of the trailer tires you have on this axle. Basically what happens is when this is on your trailer and the weight is put on, it would push down on that axle, sort of straighten it out and that will ensure that, this bend will ensure that the angle of your wheels will be correct for towing needs.

This will help as far as straight line acceleration and gives you a nice steady controlled towing. Now these idler hubs are a cast iron, they are very sturdy and durable, does have a bolt pattern of a four on four inch bolt pattern, does use a wheel stud diameter of a half inch so it does use these included half inch by 20 lug nuts and it will accept wheel size from 10 inch to 13 inches. Now the weight capacity on the axle itself is 2,000 pounds. The outer diameter of this tubing of the axle is one and three quarter inches. The diameter on the spindle is one and one sixteenths inches. Now basically on an axle there are many multiple ways to measure the length of an axle beam but basically the most accurate way is going to be the hub face to the hub face or the spring center to the spring center. Both of these will give you the most accurate measurements and on the hub center or the hub face to hub face length. Basically, it does require the hubs to be already on the axle and what you'll be doing is measuring from the base of one wheel stud on this hub, go down the axle to the base of the other wheel stud on hub right at the other side. I just want to give you an idea here, the hubs aren't on it but I can give you an idea of where they'll be positioned.

If we put a ruler on it, it will give you a hub face to hub face length on this one of 72 inches. Now the other one would be the spring center to spring center length. Actually when you measure that, that will actually give you the approximate width of your trailer itself and that's measured from the center of this spring seat to the center of this spring seat on the other side. On this one, we can get you an accurate measurement, center to center, you can see is going to be right at 58 inches. Basically, if you're going to be replacing your trailer's axle, you should be able to figure out which type you need just by determining the trailer's capacity, the bolt pattern of the wheels you're using, the brake type if it uses brakes and then those two lengths, either the hub face or the spring center lengths. That should do it for the review of part number 20440I-ST-72. This is the Dexter Trailer Axle with the standard spindles and the idler hubs in the four on four inch bolt pattern. .

Customer Reviews

Dexter Trailer Axle with Idler Hubs - 4 on 4 Bolt Pattern - 72" Long - 2,000 lbs - 20440I-ST-72

Average Customer Rating:  5.0 out of 5 stars   (7 Customer Reviews)

Trailer axle measures 72" from hub face to hub face and 58" from spring center to spring center. Includes idler hubs - with bearings, races, and seals - for 10" to 13" wheels.

- 20440I-ST-72

All the parts I ordered fit and worked great. Got my trailer back on the road in no time! 525260

- 20440I-ST-72

very pleased with the axle kit i ordered. fit perfect and wasn't missing anything. thank you. 518996

- 20440I-ST-72

OK. Finally finished my trailer mod today and installed this axle, idler hubs and springs. Noah was very helpful in sending me a missing wheel bearing from one of the idler hub kits. I am very pleased with the products I received. The only negative comment I have is I wish there had been written detailed instructions with each of the components. In particular the axle is the ez-lube type which I was not familiar with. Especially the item that is used instead of a cotter key on the axle nuts. I could not find any information on this but I'm pretty sure I figured out how to install this locks. I guess I could have called back again and asked for help but I amused to being able to figure things out for myself. 477717

- 20440I-ST-72

This axle is exactly what I needed for my trailer. It was shipped and delivered fast. All of the hardware was included as described. It is a very good quality axle. Customer service was very helpful and friendly. 237346

- 20440I-ST-72

Looks great on unfinished trailer. Can't wait to finish up. 213021

- 20440I-ST-72

Well made, less than 48 hour delivery! 199239

- 20440I-ST-72

The product I received was exactly as described on the website. I was very pleased with prompt shipping. The quality of the axle, hubs and bearings seem to be very good. Perfect for an old homemade trailer. 184102


Ask the Experts about this Dexter Axle Trailer Axles

Do you have a question about this Trailer Axle?

  • Recommended Replacement Axles and Leaf Springs for Boat Trailer with Dual 2,000 lb Axles
  • If your axles are 60 inches from hub face to hub face and 48 inches from center of spring to spring, then I recommend the Dexter Trailer Axle with Idler Hubs - 5 on 4-1/2 Bolt Pattern - 60" Long - 2,000 lbs # 20545I-ST-60-10 or the 4 bolt hub version # 20440I-ST-60. If you have longer axles with the hub face to hub face measuring 72 inches with spring centers at 58 inches, then you will want # 20440I-ST-72 for 4 bolt hubs or # 20545I-ST-72-10 for 5 bolt hubs. With any of these axles,...
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  • Can Leaf Springs be Mounted Below Trailer Axle # 20440I-ST-72
  • All you have to do to mount the leaf springs to the bottom of trailer axle # 20440I-ST-72 is to weld on new spring seats to the bottom of the axle. This axle has a 1-3/4 inch outer diameter so you would need 2 of spring seat # TRSS175. Welding should be done by a professional welder. Trailer suspension needs about 3 inches of space to travel so if there is not enough space then you would also have to use taller hangers. Dexter does not recommend using the over/under conversion kits...
    view full answer...

  • Replacement 2K Idler Axle for Carry-On Trailer Model 5x10GW2K
  • Carry-On steel-mesh trailer model 5x10GW2K uses a 2000-lb-rated idler axle. We have several 72-inch 2K-rated idler axle kits that come complete with hubs, bearings, races, seals, etc. We do not offer 2K axles without hubs. All of these use a leaf spring center spacing of 58-inches. You can see all kits by clicking on the link provided. We have both 4-on-4 and 5-on-4-1/2-inch bolt pattern kits, so just click on your wheel bolt pattern to see suitable options. Since your trailer uses...
    view full answer...

  • Recommended Trailer Axle Kit for Fabricating Off-Road Utility Trailer
  • If you are building your own firewood hauling trailer you might want to consider one of our Timbren axle-less suspension kits. These are available with idler hubs and some also have lifted spindles that can give you better ground clearance (for use in the woods when gathering your firewood). We do have standard beam axle kits too but the Timbrens can be the ideal way to go for fabricators that want an effective but simple installation of their trailer suspension. The linked page will...
    view full answer...

  • Availability of Complete 72-Inch Axle Kit with Electric Brakes and 4-on-4 Hubs
  • We do offer some complete axle/hub/brake kits such as # 35545E-ST-EZ-89 from Dexter, but we do not have a complete kit with the exact combination of features you require. We do offer 72-inch axles with 58-inch spring seats and idler hubs in your 4-on-4 bolt pattern. Part # 20440I-EZ-72 is rated at 2200-lbs and features EZ-Lube spindles. Part # 20440I-ST-72 is rated at 2000-lbs and has standard spindles. Both kits will work with 12-inch wheels and both come complete with bearings, races...
    view full answer...

  • Recommendation For Replacement 2000-Lb Trailer Axle
  • The best way to find an axle that will match your trailer is to measure the spring-center-to-spring-center distance and the hub-face-to-hub-face distance of the axle you have on your trailer currently. I have attached a drawing that shows where these dimensions are taken. It may be easier to replace the axle with an axle that has the hubs already included. If you find you need a 72-inch axle and your wheels have a 5 on 4-1/2 inch bolt pattern I recommend part # 20545I-ST-72-15. This...
    view full answer...

  • Spindle Washers for Dexter Trailer Axle with Idler Hubs
  • Yes, spindle washers are to be used except in a rare occasion where they will not fit. However, the Dexter Trailer Axle with Idler Hubs # 20440I-ST-72 does not come with washer. You will need part # SW1000.
    view full answer...

  • Recommended 10 Inch Wheels For Custom Trailer Application
  • If you are using axles like the Dexter Trailer Axle with Idler Hubs - 4 on 4 Bolt Pattern - 72" Long - 2,000 lbs # 20440I-ST-72, you can use 10 inch wheels like the Kenda 205/65-10 Bias Trailer Tire with 10" White Wheel - 4 on 4 - Load Range E # AM3H460. When building a trailer you want to make sure that you have the capacity you need for your load compatible with the lowest/weakest component in your system. For 10 inch wheels you are looking at 2000 lb axles, so you may want a...
    view full answer...

  • Are Washers Always Needed Between Spindle Nut and Outer Bearing
  • Spindle washers aren't always used. We actually sell complete axles with hubs like the # 20440I-ST-72 which does not come with washers. Typically if a washer is needed it will be on a higher capacity hub/axle.
    view full answer...

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Info for this part was:

Written by:
Lindsey S
Expert Research:
Michael H
Installed by:
Jeff D
Video Edited:
Dustin K

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