Dexter Trailer Idler Hub Assembly for 6,000-lb Axles - 6 on 5-1/2

Dexter Trailer Idler Hub Assembly for 6,000-lb Axles - 6 on 5-1/2

Item # 42655UC1

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Trailer Hub Assembly for 5200 and 6000 lb. Axle 6 on 5-1/2
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Product Images


  • 6 on 5-1/2 Inch
  • For 6000 lbs Axles
  • Hub
  • Standard
  • 14-1/2 Inch Wheel
  • 15 Inch Wheel
  • 16 Inch Wheel
  • 16-1/2 Inch Wheel
  • 25580
  • Dexter Axle
  • 15123
  • 1/2 Inch Stud
Hub is designed for use on trailer idler axles. Fits 6,000-lb axles with #42 spindles. Inner bearing (25580) and race, outer bearing (15123) and race, grease seal, grease cap, wheel bolts, and lug nuts included. Lowest Prices for the best trailer hubs and drums from Dexter Axle. Dexter Trailer Idler Hub Assembly for 6,000-lb Axles - 6 on 5-1/2 part number 42655UC1 can be ordered online at or call 800-298-8924 for expert service.

  • All Info
  • Reviews (11)
  • Q & A (123)
  • Videos (1)
  • Photos
  • Why etrailer?

Dexter Axle Trailer Hubs and Drums - 42655UC1

Hub is designed for use on trailer idler axles. Fits 6,000-lb axles with #42 spindles. Inner bearing (25580) and race, outer bearing (15123) and race, grease seal, grease cap, wheel bolts, and lug nuts included.


  • Trailer hub assembly fits idler axles
    • Bearings, races, seal, grease cap, wheel bolts, and lug nuts are included
  • Sturdy iron construction
  • Hub and drum are made in the USA


  • Application: 6,000-lb trailer axles with #42 spindles
  • Wheel size: 16" to 18-1/2"
  • Bolt pattern: 6 on 5-1/2"
  • Grease cap flange diameter: 2.44"
  • Wheel bolt diameter: 1/2"
  • Weight capacity: 3,000 lbs

Bearing, Race, and Seal Information

  • Bearings (included)
    • Inner bearing: 25580 (1.75" inner diameter)
    • Outer bearing: 15123 (1.25" inner diameter)
  • Races (included)
    • Inner race: 25520
    • Outer race: 15245
  • Grease seal (included): 10-36
    • Inner diameter: 2.25"
    • Outer diameter: 3.376"

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"

K08-213-9C Dexter Trailer Idler Hub Assembly for 6K Axle with Hardware - 6 on 5-1/2

Replaces 42655UC1

Video of Dexter Trailer Idler Hub Assembly for 6,000-lb Axles - 6 on 5-1/2

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

Video Transcript for Dexter Axle Trailer Hubs and Drums - Hub - 42655UC1 Review

Today, we're going to review part number 42655UC1. This is the Dexter Trailer Hub Assembly. It's a 6 on 5-1/2-inch bolt pattern. This trailer hub will include six of the 1/2-inch lug nuts. It will include the inner bearing, part number 25580, the outer bearing, part number 15123. It will include the grease cap and the grease seal, part number 42385.

Now, this trailer hub assembly is designed to fit 5200-pound and 6000-pound axles with spindles that will require a 2-1/4-inch inside diameter grease seal. Again, this bolt patter is six lugs, 5-1/2-inch pattern. The capacity is 3000 pounds so when paired with another hub assembly of the same on the other side of the axle, it will give you your maximum of 6000 pounds. Now, the bearing races are included and they are preinstalled and pressed into the hub already. All of our hub assemblies that we sell from eTrailer will include the bearing races preinstalled into the hub.

You can see here is the outer bearing race. In the end right there is the inner bearing race, and again, we mentioned this is a 6 on 5-1/2-inch bolt pattern and the best way to measure that--usually, on a hub that will have six lugs, an even amount of lugs, you could just measure across from one center of one lug bolt to the center of the other and that would give you the 5-1/2-inch measurement. Because this hub sticks up so high, it will be hard to get a measurement that way. So the next best way is if you measure from the center of one stud to the center of one right next to it either way. It would measure 2-3/4 inches and if you go to the product page for this part number at the bottom of the page, it will show you determining the bolt pattern and there will be a chart that says when you measure from one stud next to the next stud if it measures 2-3/4 inches.

That would be a 6 on 5-1/2-inch bolt pattern. And that should do it for the review on part number 42655UC1.

Customer Reviews

Dexter Trailer Idler Hub Assembly for 6,000-lb Axles - 6 on 5-1/2 - 42655UC1

Average Customer Rating:  4.9 out of 5 stars   (11 Customer Reviews)

Hub is designed for use on trailer idler axles. Fits 6,000-lb axles with #42 spindles. Inner bearing (25580) and race, outer bearing (15123) and race, grease seal, grease cap, wheel bolts, and lug nuts included.

- 42655UC1


Still rolling. No complaints 340584

- 42655UC1


worked fine 282250

- 42655UC1


Product as expected, delivery sooner than expected, overall very good. Replaced old hubs on moblie home axles. Very easy to do. Great service. 230167

- 42655UC1


What a fast turn around 213291

- 42655UC1


Couldnt be happier with these hubs! First one I pulled out of the box, I just verified that the races were seated, and installed after packing the bearings. One hub out of the four had a damaged bearing and seal, but it was due to packing. No biggie, was able to "coerce" the bearing and seal to look "normal". Had all four corners done and back on the road in less than 4 hours, which included uninstall of old hubs, cleaning, packing and installing new parts. Quick shipping as well. eTrailer is a great place to shop! 176900

- 42655UC1


Very helpful and pleasant purchase expe rience. 141220

- 42655UC1


very good 139645

- 42655UC1


Great service and fast shipping - Ricky was a big help making sure that everything fit together - thanks a lot! 129106

- 42655UC1


I've not have a chance to use them. 120620

- 42655UC1


I used 42655UC1 hubs on mobile home axles just required different size seal to fit spindle, great product & you guys were very helpful with helping find a hub that would fit,very pleased with this product and service. 45032

- 42655UC1


Good Experiene Website laid out good, when ordering, it showed me what products went together instead of searching to find out like which hub goes to what axle and vise versa. Fast shipping and good products. Recommend them to anyone and everyone looking for trailer parts. 4231


Ask the Experts about this Dexter Axle Trailer Hubs and Drums
Do you have a question about this Trailer Hubs and Drum?

  • How To Determine the Weight Capacity For a Trailer Axle
  • The trailer will have a plate or sticker on it that will list the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that will list the weight capacity. You can also tell the weight capacity of the axle by measuring the diameter of the axle. Here is a list that will show the axle weight capacity based on the axle diameter: Typical Axle Diameters Based on Axle Capacity - 1,000-lb - 2,000-lb Axles:...
    view full answer...

  • Can I Guess or Estimate Axle Weight Capacity By Number of Lug Nuts
  • I do have a few easier options for you to determine the weight capacity of an axle other than using the bolt pattern or the number of lug nuts. The problem with using the bolt pattern to tell the axle capacity is that an axle may have the a bolt pattern that could be more than one weight capacity. The easiest would be to look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could...
    view full answer...

  • Does a Trailer with Two 3,500 Pound Axles have a Gross Capacity of 7,000 Pounds
  • Most likely, the trailer would be rated for 7,000 pounds gross if it has two 3,500 pound axles. But there should be a sticker or plate somewhere on the frame near the front of the trailer that lists its official capacity. Also, the trailer can only be rated as high as the lowest rated component. So for example if the coupler is only rated for 6,000 pounds and everything else is rated at 7,000 then you have to go by the 6,000 pound amount.
    view full answer...

  • Tips for How to Identify a Trailer Axle
  • Depending on how the trailer was made, there will be a few spots you can check to identify the axle. First, if the trailer was pre-made by a specific company, you may be able to find this information in either the paperwork or on a placard somewhere on the frame. Sometimes, the axle identity is stamped into the axle itself or into the hub if it was purchased as a complete assembly. If you cannot find any markings or notation for the axle, you will need to look for replacement parts...
    view full answer...

  • How to Determine the Weight Carrying Capacity of a Flatbed Gooseneck Trailer
  • I would not automatically assume your trailer has a weight capacity of 20,000 lbs or more with two 10,000 lb axles. You must also consider the weight of the trailer itself and the Gross Vehicle Weight Rating (GVWR) of the trailer. The GVWR is the maximum weight that your trailer can weigh when it is loaded. This should be listed on the identification or specs plate on the nose of your trailer. The best way to determine the load capacity of your trailer is to subtract the weight of the...
    view full answer...

  • Determining Axle Weight Capacity for Boat Trailer with 1-3/4-inch x 2-3/4-inch Rectangular Axle
  • Typically boat trailers with 13-inch tires and a 5-on-4-1/2-inch wheel bolt pattern will have either 2000-lb- or 3500-lb-rated axles. The link provided will show you examples of hub-and-drum assemblies with your bolt pattern and wheel size range that fall into these two weight categories. For example, Dexter hub # 84545BX is for 3500-lb axles while # 8-258-5UC1 is for 2000-lb-rated axles. The hub assembly you referenced, part # 42655UC1 from Dexter, has a 6-on-5-1/2-inch bolt pattern...
    view full answer...

  • Comparing Leaf Spring Axles, Torsion Axles, Dexter and Hayes/AL-KO
  • I personally would not have any reservations about using a torsion axle. Dexter is a leader in the industry but Hayes/AL-KO are quality as well. It seems to be easier to get parts for Dexter axles and they tend to cost less. On a torsion axle you will want to be cautious not to overload it (of course this goes with leaf spring axles too). The suspension components on leaf spring axles are easier to replace as well but a torsion axle is going to give you good performance provided you...
    view full answer...

  • How to Determine Axle/Trailer Capacity on an Unknown Trailer with No Markings
  • This sounds like a small utility trailer or a kit trailer. In order to determine the capacity as best as I can I would need to know the inner and outer bearing numbers stamped into the metal of the bearings. It is possible that there is a sticker or plate somewhere on the trailer indicating, among other things, the capacity of the trailer. Since it doesn't have a regular axle there is likely no marking on it but you will still want to look everywhere that you can for any identifying...
    view full answer...

  • Which Trailer Axle Company is Best, Lippert Dexter or Al Ko
  • I would recommend Dexter Torflex axles the highest for torsion axles. And then put Al Ko and Lippert at about the same in quality. I was searching around online and the common consensus among the trailering forums is that the Dexter axles are definitely the ones to go with if at all possible. Lippert is a great company that does a ton of things really well, but Dexter does axles the best.
    view full answer...

  • Typical Axle Ratings Based on Axle Diameter
  • Typically 1-1/2 to 1-3/4 inch diameter axles have 1,000-1,200 lb capacities. Since your axles are smaller than that I can only assume slightly less than 1,000 lbs. On some trailers there will be a plate or sticker that will list the trailer capacities. Since your motorcycle is right at 900 lbs I would be hesitant to put it on that trailer. Here's a breakdown on typical axle weight ratings based on axle diameter: 1,000-lb - 2,000-lb Axles: 1-1/2" - 1-3/4" diameter 3,500-lb Axles:...
    view full answer...

  • How to Determine Square and Round Tube Axle Capacity
  • Looks like you found the chart that Jeff D made that shows common axle capacities based on diameter: Typical Axle Diameters Based on Axle Capacity - 1,000-lb - 2,000-lb Axles: 1-1/2 inch - 1-3/4 inch diameter - 3,500-lb Axles: 2-3/8 inch diameter - 6,000-lb - 7,200-lb Axles: 3 inch diameter - 8,000-lb Axles: 3-1/2 inch diameter - 9,000-lb Axles: 4 inch diameter - 10,000-lb Or more axles: 5 inch diameter These capacities are for round axles. Square axle capacities are...
    view full answer...

  • Determining the Carrying Capacity of Trailer
  • It is highly likely that you can carry 5,000 pounds on two 3,500 pound axles. The carrying capacity of two 3,500 pound axles is 7,000 pounds. The axles support not only the cargo's weight but also the weight of the trailer's frame and body. You will need to calculate the total weight of the trailer frame and body, also known as the dry weight, and subtract this weight from the axle's 7,000 pound capacity to find the weight the axles can carry. Then, you will want to add back the...
    view full answer...

  • How To Determine Weight Capacity Of Torsion Axles
  • Since there can be many combinations of axles with hubs and bolt patterns, the best way to determine your axle weight capacity is by using the part numbers of the inner and outer bearings in the hub. I have attached a photo that shows you where you can locate the part number on your bearings. With this information we can give you a more accurate weight capacity for your axles. If you cannot find the numbers on your bearings, you can take some measurements on your spindle. this would...
    view full answer...

  • How to Determine the Weight Capacity of a Dexter Hub and Axle
  • Based on your bearing dimensions, I think Dexter meant to say that the replacement hub for you is a 6-lug hub rated for a 5,200 lb axle, not that it is a 5,200 lb hub. Your axle is likely rated for 5,200 lbs, especially since the axle tubing has a 3-1/2 inch diameter. I have not heard of a hub with a 6-lug bolt pattern for a 10,000 lb axle or a 10,000 lb axle with 3-1/2 inch diameter tubing. The Dexter Hub Assembly, # 42655UC1, that you referenced is likely going to be the hub that...
    view full answer...

  • Trailer Capacity for Axles with 5 Lugs
  • Technically, a trailer rated for 10,000 lbs can have 5 lug hubs. They are most common on 3,500 lb axles but can be used on the rare 4,000 lb axles as well. You could have a gooseneck or 5th wheel trailer with the 10,000 lb capacity and tandem axle 5 lug axles because the tongue weight can carry the rest. If you have a triple axle trailer, it is far more likely to have that capacity. Most trailers rated for that capacity will have larger tandem axles and require a 6 on 5-1/2 inch bolt...
    view full answer...

  • Trailer Axle Capacity for a Trailer with 2-1/2 inch Diameter Axles
  • The following guidelines on trailer axle capacities are common sizes/capacities, but there are other axle sizes and capacities that are possible. These are just the most common ones. Typical Axle Diameters Based on Axle Capacity - 1,000-lb - 2,000-lb Axles: 1-1/2 inch - 1-3/4 inch diameter - 3,500-lb Axles: 2-3/8 inch diameter - 6,000-lb - 7,200-lb Axles: 3 inch diameter - 8,000-lb Axles: 3-1/2 inch diameter - 9,000-lb Axles: 4 inch diameter - 10,000-lb Or more axles: 5 inch...
    view full answer...

  • How To Determine The Diameter Of An Axle
  • Ideally you would be able to get the measurement of your axle by using a precision instrument like dial calipers. There may also be a sticker or a tag on the trailer or axle that tells you the rated weight capacity of your axle. If you are looking to replace the bearings, races, or seals on your trailer, you can disassemble your hub, and remove the components, and use the numbers stamped on them for replacements. I have attached a link to a helpful article that explains how to replace...
    view full answer...

  • Are there Replacement Hubs Available that will Fit a Mobile Home Axle
  • To positively determine which hub will fit a spindle, you will need either the bearing numbers from the bearings for that spindle, or you can take some precise measurements on the different steps on a spindle. That being said, often times you will not be able to find replacement parts for a mobile home axle as they are designed for one time use applications. Replacement parts are simply not available for most mobile home axles. But if you can find the bearing numbers or collect the...
    view full answer...

  • Replacement Hub Recommendation for a Calkins Boat Trailer
  • The bolt pattern is helpful information for picking out the correct replacement hub, but you need more info. You will want to remove your current hub to get the bearing numbers off of the bearings in your hub. With that info I can help you pick out the correct hubs. If you cannot see the part numbers on the bearings or grease seal, then you can take a few measurements on your spindles. I recommend using a precise measuring tool such as a dial caliper because these measurements will...
    view full answer...

  • What is the Weight Capacity of a Dexter SLR P16 Axle
  • If you can read me the serial number on the axle I can then call the manufacturer, Dexter, and find out the weight capacity but if not you can measure the diameter and use the chart below to determine axle capacity. The "P16" is the plant it was made. - 1,000-lb - 2,000-lb Axles: 1-1/2 inch - 1-3/4 inch diameter - 3,500-lb Axles: 2-3/8 inch diameter - 6,000-lb - 7,200-lb Axles: 3 inch diameter - 8,000-lb Axles: 3-1/2 inch diameter - 9,000-lb Axles: 4 inch diameter - 10,000-lb +...
    view full answer...

  • Can the VIN of a Boat Trailer be Used to Determine Age of Trailer
  • Typically the 7th digit of a trailer VIN is the year the trailer was manufactured. I attached a picture that shows a VIN decoder for trailers for you to check out as well. You can also give the VIN to the trailer manufacturer and I am sure they will be able to fill you in on all of the details as well.
    view full answer...

  • How to Determine Capacity of Trailer Axle with 8 Lug Wheels
  • If the trailer has 8 lug hubs that would indicate typically that the capacity for each axle is at least 5,200 lbs. Now if you go out and measure the outside diameter of the axle you'll get an even better idea. Typical Axle Diameters Based on Axle Capacity - 1,000-lb - 2,000-lb Axles: 1-1/2 inch - 1-3/4 inch diameter - 3,500-lb Axles: 2-3/8 inch diameter - 6,000-lb - 7,200-lb Axles: 3 inch diameter - 8,000-lb Axles: 3-1/2 inch diameter - 9,000-lb Axles: 4 inch diameter - 10,000-lb...
    view full answer...

  • Can a Spindle be Replaced on a 7,000 Pound Trailer Axle
  • You are describing a spindle like # R50342EZ but it uses a tang washer, not a cotter pin because of the grease fitting. The problem is that aftermarket spindles are under rated compared to the OEM counterparts. This is actually not a bad thing because cutting off the old spindle and welding on a new one is a specialized job. If not done right it could cause tire wear problems, trouble with the suspension, tracking and sway problems and so on. It would be better to replace the axle. We...
    view full answer...

  • Recommended Hubs and Spindles for 2500 lb Homemade Trailer
  • The first thing to determine is if you want an idler hub or a hub/drum. The weight threshold at which brakes are mandated varies by state, so you might want to check that with your state police or highway patrol. If you decide on an idler hub (no brakes), I'd recommend the # 42655UC1 hub from Dexter Axle. The bearings, races, grease seal, lug bolts and grease cap are included. The hub will have more than enough capacity for your application. This hub would use the # R50642 spindle. For...
    view full answer...

  • What is the Capacity of a Round Trailer Axle with a 3 Inch Diameter
  • Axles rated for 6,000 to 7,200 pounds usually will have 3 inch diameters. But it is possible for 5,200 pound axles or even 3,500 pound axles to have a 3 inch diameter axle. You could err on the side of caution and say each axle is rated for 3.5K for a total of 7K for the 2 axles combined. But there should be some information somewhere on the axles that indicate the capacity. There could be a tag that explicitly states the capacity or some numbers that would indicate the model of the...
    view full answer...

  • Axle Recommendation for a Trailer for Best Ground Clearance
  • If ground clearance is your primary concern I have a great solution for you. Instead of a standard axle like the part # T3584F-EZ-8974 that you referenced you would want a Timbren Axle-Less system like the part # ASR35HDS02. This setup has the same capacity as the axle you referenced, does not have an axle that runs under the trailer, has a 4 inch lift built into it, and has wider clearances for larger off-road tires. For a hub for this setup you would want the part # 42655UC1.
    view full answer...

  • Is a 2-3/8 inch Diameter Axle a 3,500 lb Capacity Axle
  • 2-3/8 inch diameter axles are 3,500 lb axles. If you happen to be looking for a replacement 3,500 lb hub we have several at the attached link. The most popular being the part # AKHD-545-35-EZ-K.
    view full answer...

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