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  1. Trailer Hubs and Drums
  2. Dexter
  3. 8 on 6-1/2 Inch
  4. For 8000 lbs Axles
  5. Hub with Integrated Drum
  6. 16 Inch Wheel
  7. 16-1/2 Inch Wheel
  8. 17 Inch Wheel
  9. 17-1/2 Inch Wheel
Dexter Trailer Hub and Drum Assembly for 8,000-lb Axles - 12-1/4" - 8 on 6-1/2 - Oil Bath

Dexter Trailer Hub and Drum Assembly for 8,000-lb Axles - 12-1/4" - 8 on 6-1/2 - Oil Bath

Item # 8-285-9UC3
Our Price: $497.64
Trailer Hubs and Drums
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Install this hub-and-drum assembly on your trailer. Fits 8,000-lb axles. Inner bearing (25580) and race, outer bearing (02475) and race, oil seal, oil cap, wheel bolts, and lug nuts included. Oil bath system allows for easy maintenance. Great Prices for the best trailer hubs and drums from Dexter. Dexter Trailer Hub and Drum Assembly for 8,000-lb Axles - 12-1/4" - 8 on 6-1/2 - Oil Bath part number 8-285-9UC3 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (17)
  • Q & A (0)
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Dexter Trailer Hubs and Drums - 8-285-9UC3

  • 8 on 6-1/2 Inch
  • For 8000 lbs Axles
  • Hub with Integrated Drum
  • 16 Inch Wheel
  • 16-1/2 Inch Wheel
  • 17 Inch Wheel
  • 17-1/2 Inch Wheel
  • 02475
  • Oil Bath
  • 25580
  • 9/16 Inch Stud
  • Dexter

Install this hub-and-drum assembly on your trailer. Fits 8,000-lb axles. Inner bearing (25580) and race, outer bearing (02475) and race, oil seal, oil cap, wheel bolts, and lug nuts included. Oil bath system allows for easy maintenance.


  • Trailer hub-and-drum assembly provides surface area for brake shoes to grip when brake is activated
    • Compatible with electric and hydraulic drum brakes
  • Oil bath lets you check lubricant level without disassembling the hub
    • Look through clear oil cap to check lubrication
  • Sturdy iron construction
  • Bearings, races, oil seal, oil cap, wheel bolts, and lug nuts are included
  • Hub and drum are made in the USA


  • Application: 8,000-lb trailer axles
  • Drum dimensions: 12-1/4" diameter x 3-3/8" wide
    • Works with 12-1/4" brake assembly
  • Bolt pattern: 8 on 6-1/2"
  • Wheel stud diameter: 9/16"
  • Pilot hole diameter: 4-3/4"
  • Weight capacity: 4,000 lbs

Bearing, Race, and Seal Information

  • Bearings (included)
    • Inner bearing: 25580 (1.75" inner diameter)
    • Outer bearing: 02475 (1.25" inner diameter)
  • Races (included)
    • Inner race: 25520
    • Outer race: 02420
  • Oil seal (included): 10-63
    • Inner diameter: 2.250"
    • 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"

K08-285-92 Dexter 12-1/4" Hub and Drum Assembly for 8K Axle with Hardware - 8 on 6-1/2 - Oil Bath

Replaces 8-285-9UC3 and 123050

Customer Satisfaction Score:

Customer Reviews

Dexter Trailer Hub and Drum Assembly for 8,000-lb Axles - 12-1/4" - 8 on 6-1/2 - Oil Bath - 8-285-9UC3

Average Customer Rating:  4.3 out of 5 stars   (17 Customer Reviews)

Install this hub-and-drum assembly on your trailer. Fits 8,000-lb axles. Inner bearing (25580) and race, outer bearing (02475) and race, oil seal, oil cap, wheel bolts, and lug nuts included. Oil bath system allows for easy maintenance.


The break parts are like original. When we got it back together we got our trailer DOT certified.Life can go on.



The parts installed made the trailer work like new.


Need to ship in better packaging. Boxes came in with holes. Parts were missing.
Replacement parts were sent out but the job is now delayed waiting on the parts.


The hub and bearings came quickly, fit perfectly, and have run as they should. I'm a happy customer.


It was easy finding the right hub for the trailer. Everything was correct and made the job easy to complete.


We received only three of the four packages that were supposed to have arrived… not sure where the fourth is, but we’re in a real pickle without it.!




Service and delivery was spot on staff that I talked to were great thanks it won’t be the last time I order


by: 03/21/2024


Fast service


Great Service as always...thank you








See what our Experts say about this Dexter Trailer Hubs and Drums

  • Replacement Oil Bath Hub Drum for 8 on 6-1/2 Bolt Pattern on 8,000 lb Axle
    The Trailer Hub and Drum Assembly - 8,000-lb Axles - 8 on 6-1/2 - Oil Bath # 8-285-10UC3-A is the replacement option we have. The only difference is the wheel studs are 5/8 inches instead or the 9/16 inch wheel studs of your current hub. This comes with the lug nuts you need as well, so it will be an easy swap and will fit your wheels.
    view full answer...
  • Replacement Electric Trailer Brakes For A Hayes 8K 4 Bolt Axle
    Yes, The Dexter Electric Trailer Brake Kit - Self-Adjusting - 12 inch - Left Hand and Right Hand - 8K # K23-532-533-00 will work with your Hayes 8k 4 bolt axle. When it comes to getting the correct hub and drums you will have to first find out what your Inner and Outer Bearing numbers are on your current hub. The bearings should have an etched or stamped number on it. If you can not find the stamp you can measure the inner diameter of the bearings using The Digital Caliper # PTW80157....
    view full answer...
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  • How Much Bearing Preload Should be On Dexter 8k Axle
    There is not an exact torque specification to pre-load the bearings on a Dexter 8k axle. The spindle nut will need to be tightened by hand until finger tight and then turned another 1/4 of a turn with a wrench. This will be around 15 ft-lbs but you should not be using any sort of torque wrench for this. Once this is done you can then turn the hub ten or so times to seat the bearings and races but don't forget to back the spindle nut off some before you install the cotter pin and put the...
    view full answer...
  • Can 8k Dexter Hub # 8-218-9 be Used to Replace # 8258-9UC3
    Yes, the Dexter 8k hub/drum part # 8-218-9 could be used to replace the hub you mentioned # 8-285-9UC3.
    view full answer...
  • Availability of High Capacity Spindle
    The highest capacity trailer spindle we offer is the TruRyde # TRU57FR spindle for 5.2-7K rated axles. The spindles are compatible with a 25580 Inner and an outer bearing with a 1.25 inch ID like the # 14125A, # LM67048, or # 15123.
    view full answer...
  • Replacement Hub/Drum for Lippert 8k Hub 2420801
    The Lippert 2420801 hub is an 8k hub with an 8 lug bolt pattern so for a replacement you'd just need the part # 8-285-10UC3-A.
    view full answer...
  • Replacement Hubs for 8000lb Lippert Axle
    Yes, the Dexter Hub Assembly # 8-285-9UC3 will fit on your Lippert Axle, but after checking with Lippert it looks like the 8k axle that you're using originally came with a hub with 5/8" stud diameter, where this Dexter Hub has 9/16" studs- both hubs use inner bearing # 25580 /outer bearing # 02475 . In order to avoid having to change out your wheels as well, I recommend going with the Redline Hub and Drum Assembly # 8-285-10UC3-A . It is also an oil lubricated hub, has 5/8" studs and will...
    view full answer...
  • How to Tell if Trailer Hub 8-258 Will Fit Spindle
    We do have the Dexter trailer hub and drum part # 8-285-9UC3 which might work but you would need to verify a few things. This is an 8k oil-bath hub with a bolt pattern of 8 on 6-1/2 inches. The bearings it takes are 25580 Inner / 02475 Outer. You would need to pull the hubs you have to get the bearing numbers or the dimensions where the bearings ride. If those dimensions are 1.74 inch and 1.25 inch this hub would fit.
    view full answer...
  • Replacement Brake Assemblies for Dexter 8-285 Oil Bath Hub and Drum for 8,000 Pound Axle
    For your 8-285 hub and drum similar to the Dexter Hub and Drum, Oil Bath # 8-285-9UC3 for 8K pound axles, the Dexter Electric Brake Assembly, Right Hand # 23-435 and Left Hand # 23-434 are the correct fit brake assemblies for your axle. Another great option for replacement trailer brake assemblies are the Electric Trailer Brake with Dust Shield, Left Hand # AKEBRK-8L and Right Hand # AKEBRK-8R. These brake assemblies have the 12-1/4 inch x 3-3/8 inch size needed for your hub, are designed...
    view full answer...
  • Can Dexter Nev-R-Lube Hubs Be Replaced with Oil Bath Hubs
    The existing Dexter 8K Nev-R-Lube spindles on your trailer are designed specifically for the cartridge-style bearing that the corresponding Nev-R-Lube Hubs # 8-389-81UC3 use. The spindles themselves are uniquely sized for this purpose so unfortunately the hubs can't be replaced with standard hubs that use traditional inner and outer bearings, including oil-bath units like the Dexter 8K # 8-285-9UC3 that you referenced. The only way to switch to hubs like this would be to replace the entire...
    view full answer...
  • Can Lippert 8K Axle be Converted to Oil
    Yes you can convert your Lippert 8K axle so that it works with oil instead of grease. Just swap out your hub and drum assembly with one that has threads for the oil cap to install on. For example, the Dexter Axle part # 8-285-9UC3 should work just fine but you need to verify that the inner bearing # 25580 and outer bearing # 02475 are correct as well as the oil seal with the 2.250" inner diameter. If this fits then the only other thing you need is bearing oil like part # XLPROLUBE. Please...
    view full answer...
  • How Much Torque Should I Put On Spindle Bolt On Dexter Trailer Hub and Drum Assembly # 8-285-9UC3
    For a trailer axle spindle nut like part # 165686 you will need to run the spindle nut down until there is no more side-to-side play in the hub and then back it off to the next notch so you can secure the cotter pin, like part # 165649, through the spindle. There is not a specific torque to follow for the nut. If you have any further questions please reach back out to me and I will be more than happy to further assist you in your towing endeavors.
    view full answer...
  • Replacement Electric Drum Brakes and Hub/Drum Assembly for Dexter Axle
    I was able to contact Dexter Axle and get the information on your axle. The p12 that you referred to has to do with the location of the plant that manufactured your axle. The direct replacement for your drum brakes would be the Right Hand Assembly # 23-435 and the Left Hand Assembly # 23-434. These are the self-adjusting brakes with the 4 bolt pattern to match with your brake mounting flange. The Hub & Drum Assembly - 8 on 6-1/2 - Oil Bath # 8-285-9UC3 comes with the correct hub, drum,...
    view full answer...
  • Replacement Oil Bath Hub and Drum Assembly for 8K Dexter Axle
    If just the spindle is damaged then you could probably get away with just replacing the spindle, but if the axle is damaged then you'll to replace the whole axle. If you aren't sure how much is damaged then you might want to have a shop look at your trailer just to make sure you have a safe setup. We do have replacement hub/drum assemblies that use the oil bath setup but for spindles and an axle that large you'll need to have a shop place that order for you. For the hub/drums you'll need...
    view full answer...
  • Does Dexter Hub part # 8-285-9UC3 Come with Bearings/Seal/Lug Nuts
    The Dexter Hub part # 8-285-9UC3 comes with bearings and seal but does not come with lug nuts. For that you would need part # 6-53 since the studs are 9/16 inch.
    view full answer...

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Jeff D
Installed by:
Jeff D
Employee Adele M
Updated by:
Adele M
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Hannah L
Updated by:
Hannah L

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