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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Shipping Weight: 14 lbs

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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.
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  • Reviews (11)
  • Q & A (158)
  • Videos (1)
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Dexter Axle Trailer Hubs and Drums - 42655UC1

  • 6 on 5-1/2 Inch
  • For 6000 lbs Axles
  • Hub
  • Standard
  • 16 Inch Wheel
  • 16-1/2 Inch Wheel
  • 17 Inch Wheel
  • 17-1/2 Inch Wheel
  • 18 Inch Wheel
  • 18-1/2 Inch Wheel
  • Dexter Axle
  • 25580
  • 1/2 Inch Stud
  • 15123

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?

  • Can I Upgrade from 6 Lug to 8 Lug Wheels to Help Increase Weight Rating of my Trailer?
  • Because the total weight capacity of your trailer is limited by the lowest rated component, your axle capacity won't be increased by adding hubs with more lug nuts to the equation-even if they are rated higher than the axle. Moving to 8-lug hubs sounds like you want to move from 5,200-lb axles up to 7000-lb axles. If this is the case, then we have a few options for you listed below; I've also linked below all of the 7000-lb axles we currently have available. Best Upgrade: Timbren Axle-Less...
    view full answer...

  • Replacement Wheel Stud for 3,500 lb Axle Hub
  • Most likely you have a Dexter 3,500 lb hub which uses basically the standard wheel studs as other 3,500 lb hubs as well. So the correct replacement wheel stud would then be the part # 7-122.
    view full answer...

  • Replacement Brake Assemblies for 1997 Fleetwood Mallard
  • Your 1997 Fleetwood Mallard uses standard brake assemblies and hubs. To remove the hub, you will need to remove the spindle nut and then pull the hub/drum assembly off the spindle to access the brake assembly. If the hubs have been on for a long time sometimes using a rubber mallet around the edges of the drum will help get it to move more easily. If you have 12 inch diameter brake assemblies, then you will want assembly # AKEBRK-7-SA. If you have 10 inch diameter assemblies you...
    view full answer...

  • How Can I Identify an Axle Without a Sticker?
  • Thank you for the pictures! It looks like you've got some sort of square drop axle on your trailer and if you can't find an identifying sticker, I can still help you figure out what you've got so that you can make the swap to electric brakes on your trailer. It looks like you've got 6 bolts on the wheels, which can help narrow down our search, but we'll need to know what size the brakes on the trailer are and if possible, what size (or number) the inner and outer bearings are on the...
    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...

  • How to Determine Dexter Axle Weight Capacity
  • I reached out to my contact at Dexter and they don't have any information based on that serial number in their system. They recommended taking off one of the wheels and on the hub there will be a number that starts with 8 followed by a dash and then 3 more numbers. We can help with axle capacity based on that number. As far as camber, all through axles will have a slight bow in the middle which would appear to be a camber when unloaded but they do even out when under load so there...
    view full answer...

  • Axle Capacity for a Hayes Axle with 8 on 6-1/2 Bolt Pattern
  • You likely have an 8 on 6-1/2 bolt pattern which is normally found on 5,200 pound axles to 10,000 pound axles. The majority of axles with this bolt pattern are 7,000 pound axles. If you could pull off a hub and tell me the numbers stamped on the sides of the inner and outer bearings that can help narrow it down. To further narrow it down if you could tell me the diameter of the axle and inner diameter and width of the drum, if equipped, that will help a lot. The second most common...
    view full answer...

  • Is a Axle Stamped with D80 an Dexter 8k Rated Axle
  • The D80 you mentioned in the info you found indicates that you do have a Dexter 8k axle. If you are looking for a replacement hub for this axle the part # 8-287-14UC1 is a 8k rated Dexter hub designed to fit that spindle.
    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...

  • 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...

  • 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...

  • 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...

  • Which Hub Do I Need for the R50642 Spindle.
  • The hub you will need for the Spindle 2.25 inch RD x 6 inch STUB, item # R50642, is the Trailer Hub Assembly - 5,200 & 6,000 lbs Axles - 6 on 5-1/2, item # 42655UC1.
    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 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...

  • How to Find Axle Capacity by the Diameter of a Trailer Axle
  • First you should know that mobile home axles are designed for one time use only even though people do use them to make trailers. I bring this up because the fact that they are designed for one time use means that replacement parts are hard to come by. With that said single axle trailers come in all sorts of capacities. What matters is the axle capacity. To determine the capacity there are a couple of things I can look at. First you can measure the axle diameter. Usually, but not always,...
    view full answer...

  • Correcting Heat Damage to Car Trailer Spindles After Bearings Burned Up
  • A spindle's surfaces really need to be perfect to prevent damage (or early wear) to your bearings and seal. It sounds like you did a pretty effective job of removing most of the scoring but the concern is hidden heat damage to the spindle. This cannot be corrected by the emery cloth. If your bearings burned up then there is a chance the spindles could have been weakened. Either the spindles or the entire axle should be replaced. You can replace your torsion axle or install a Timbren...
    view full answer...

  • How To Determine Trailer Axle Weight Capacity And Replacement Hub Components
  • Depending on the age and condition of the trailer, it may have a sticker or plate that has the weight capacity of the trailer listed. If you aren't able to find a sticker or plate, you can determine the weight capacity of your axle by using a precision tool like part # PTW80157. Here are the typical axle diameters between the hubs based on axle capacity. You will need to measure the axle beam. the tire does not actually have to be removed for that. - 1,000-lb - 2,000-lb Axles: 1-1/2...
    view full answer...

  • How to Determine Square Axle Trailer Capacity
  • Square axle capacities are pretty hard to determine. Unlike round axles, they do not have set capacities based on their dimensions. But what you can do is give me some exact measurements of your spindle and we should be able to see if there is a hub we carry that would fit so that you could at least get a ballpark on your capacity. Bearing numbers would work as well. Near the coupler of the trailer there should be a plate or sticker that would have the VIN. There should be capacities...
    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...

  • Hubs and Bearings Used in 5200-lb Axles
  • The hubs from your 3500-lb axles could theoretically be re-used on a different axle IF both axles have the same spindles that use the same bearings, but this is unlikely. Typically 3500-lb axles accept hubs that use bearings # L68149 and # L44649 while 5200-lb axles most often use bearings # 25580 and # LM67048. Even if it were the case that the two axles used the same spindles (again, very unlikely) then using the 3500-lb hubs on the 5200-lb axle would mean you gained no weight capacity...
    view full answer...

  • Determining Axle Weight Capacity of 3 inch Axles
  • Typically axles with a 3 inch diameter have a range of weight capacity ranging from 5,200 to 7,200 pounds. This is the weight capacity of each axle. Therefore, you camper trailer axles could have a combined weight capacity ranging from 10,400 to 14,400 pounds. Please keep in mind that this is an approximate weight axle range and your specific trailer axles may be different, especially considering the age of your trailer. I have also included some helpful articles that might of beneficial...
    view full answer...

  • Recommended Replacement Hub Assembly For Utility Trailer
  • With the part numbers you provided for your bearings I recommend the Dexter Trailer Hub Assembly, part # 42655UC1. This idler hub has a 6 on 5-1/2 wheel bolt pattern and is designed for 6,000-lb trailer axles. This hub assembly comes with bearings, races, seal, grease cap, wheel bolts and lug nuts. Since you said you want to change the hub to a non-brake assembly, you will need to either replace the surge coupler or lock it out so it cannot move in or out. Since you are going...
    view full answer...

  • Does the Tongue Weight of a Trailer Get Transferred to the Rear Axle of a Truck
  • A trailer with 280kg (617 pounds) tongue weight would exert less than that weight on the actual rear axle of the tow vehicle. There isn't a calculator for this because you also have to take into account suspension components which transfer weight to the frame and only a portion of that gets transferred to the axle. The best way to get a good estimate of how much weight is on the rear axle is to use a scale that can be placed just under the rear wheels. Then you could weigh the tow vehicle...
    view full answer...

  • How to Determine the Axle Capacity of Axles on a 1977 Dilly Tandem Axle Trailer
  • I can tell you with relatively high accuracy what the axle capacities probably are based on the inner and out bearing numbers. If you can tell me what the numbers are on the bearings are by pulling a hub I can give you a more definitive answer. A 5 on 4-1/2 hub can be found on everything from 2,000 to 3,500 pound axles so know the bearing numbers is important. I have included a link to a video that will help you with this project.
    view full answer...

  • Are Two 1,750 Pound Torsion Axles Rated for a Combined 3,500 Pounds or Just 1,750 Pounds
  • A torsion axle would have spindles to attach hubs at each end so it has the same capacity rules as a regular axle. If you have 2 torsion axles rated at 1,750 pounds each then the total is 3,500 pounds. There are also some axle-less systems that are like torsion axles. So for example # ASR35HDS02 is rated for 3,500 pounds total or 1,750 per half. Other factors affect the capacity including the tire and wheel capacity, hub capacity, and coupler capacity. Basically you go by the lowest...
    view full answer...

  • Help Identifying Capacity of Square Tube Axle
  • Square axles are hard to find capacities for as they don't have a standard capacity based on dimension like round axles. Since I can see a 4 bolt mounting flange for a brake assembly that means the max it woudl be rated for would be 3,500 lbs. Between 2,200 lb and 3,500 lb would be about as close as I can say.
    view full answer...

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