bing tracking image
  1. Trailer Hubs and Drums
  2. Dexter Axle
  3. 5 on 4-1/2 Inch
  4. For 2000 lbs Axles
  5. Hub
  6. 13 Inch Wheel
  7. 14 Inch Wheel
  8. 14-1/2 Inch Wheel
  9. 15 Inch Wheel
Dexter Trailer Idler Hub Assembly for 2,000-lb Axles - 5 on 4-1/2 - Galvanized

Dexter Trailer Idler Hub Assembly for 2,000-lb Axles - 5 on 4-1/2 - Galvanized

Item # 8-258-50BTUC1
Our Price: $62.25
Trailer Hubs and Drums
This item qualifies for Free Shipping
Shipping Weight: 7 lbs
In Stock
Dexter Axle Hub - 8-258-50BTUC1
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images


Need help with installation?
Locate installers near me
Galvanized idler hub assembly is great for marine use. Fits 2,000-lb axles with BT8 spindles. Inner bearing (L44643) and race, outer bearing (L44643) and race, grease seal, grease cap, wheel bolts, and galvanized lug nuts included. Great Prices for the best trailer hubs and drums from Dexter Axle. Dexter Trailer Idler Hub Assembly for 2,000-lb Axles - 5 on 4-1/2 - Galvanized part number 8-258-50BTUC1 can be ordered online at or call 1-800-496-5010 for expert service.
  • All Info
  • Reviews (7)
  • Q & A (0)
  • Photos
  • Why etrailer?

Dexter Axle Trailer Hubs and Drums - 8-258-50BTUC1

  • 5 on 4-1/2 Inch
  • For 2000 lbs Axles
  • Hub
  • 13 Inch Wheel
  • 14 Inch Wheel
  • 14-1/2 Inch Wheel
  • 15 Inch Wheel
  • Standard
  • 1/2 Inch Stud
  • L44643
  • L44643
  • Dexter Axle

Galvanized idler hub assembly is great for marine use. Fits 2,000-lb axles with BT8 spindles. Inner bearing (L44643) and race, outer bearing (L44643) and race, grease seal, grease cap, wheel bolts, and galvanized lug nuts included.


  • Marine-grade trailer hub assembly fits idler axles
    • Includes bearings, races, grease seal, grease cap, and zinc-coated lug nuts
  • Zinc plating has a 500-hour salt spray rating
    • Ideal for use on a boat or snowmobile trailer
    • Durable enough for saltwater applications
  • Hub and drum are made in the USA


  • Application: 2,000-lb trailer axles with BT8 spindles
  • Wheel size: 13" to 15"
  • Bolt pattern: 5 on 4-1/2"
  • Hub flange diameter: 6-1/2"
  • Grease cap flange diameter: 1.988"
  • Wheel bolt dimensions: 1/2" diameter x 2" long
  • Weight capacity: 1,000 lbs

Bearing, Race, and Seal Information

  • Bearings (included)
    • Inner bearing: L44643 (1" inner diameter)
    • Outer bearing: L44643 (1" inner diameter)
  • Races (included)
    • Inner race: L44610
    • Outer race: L44610
  • Grease seal (included): 34823
    • Inner diameter: 1.249"
    • Outer diameter: 1.983"

Corrosion Resistance for Marine Use

This trailer hub assembly has a zinc coating that resists corrosion, making it ideal for use on your boat or snowmobile trailer. All GAL-DEX hubs undergo a test in which they are sprayed with a 5-percent salt solution to determine corrosion resistance over time. These products are able to withstand 500 hours of constant exposure to the saltwater mist. This 500-hour salt spray rating indicates that a product is not only durable enough to last in freshwater environments, but it can also be used on trailers that come into contact with saltwater.

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"

8-258-50-BTUC1 Dexter Trailer Idler Hub Assembly for 2K Axle with Hardware - 5 on 4-1/2 - GAL-DEX

Customer Satisfaction Score:

Customer Reviews

Dexter Trailer Idler Hub Assembly for 2,000-lb Axles - 5 on 4-1/2 - Galvanized - 8-258-50BTUC1

Average Customer Rating:  4.6 out of 5 stars   (7 Customer Reviews)

Galvanized idler hub assembly is great for marine use. Fits 2,000-lb axles with BT8 spindles. Inner bearing (L44643) and race, outer bearing (L44643) and race, grease seal, grease cap, wheel bolts, and galvanized lug nuts included.


The hub was of excellent quality and the shipping was a day earlier than expected.
Thank you etrailer


Ordered springs, hubs and a new grease gun with a flex hose. The springs and hubs were great with etrailers usual fast shipping. The grease gun works well except the fitting on the grease gun flex hose that attaches to the grease zirc fitting on the plastic bearing buddy type axle greaser was so tight I couldn't remove it from the zirc fitting. I finally had to pull and bend so hard it actually pulled the zirc fitting out of the bearing buddy thus ruining it. That was aggravating as now it has to be replaced. As I said, it was a plastic bearing buddy and probably not great quality but no other grease gun fitting has had that problem.


Kit comes with everything you need to replace your trailer axle hub but a new cotter pin and wheel bearing grease. Looks like good quality parts, shipped quickly, installed easily and haven't had any issues with performance.


The hubs went together great, until it was time for the grease cap. The new ones deformed too easily. I ended up using other heavier cups. Otherwise I'm happy.



Great deal and design!



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

  • Trailer Hub Recommendation for Dexter 1,200 lb Trailer Axle
    For a Dexter hub that would fit a 1,200 Dexter Axle you would want the part # 8-258-50BTUC1 which has a 5 bolt lug pattern like you said you would need as well. Just to verify the seal dimensions this comes with a seal that has an inner diameter of 1.249 inches and an outer diameter of 1.983 inches.
    view full answer...
  • Correct Hub Assembly for Dexter 8-258 Hub and 13-Inch Wheels
    With axle 8-258, your bearings are either # L44643 or # L44649. # L44643 bearings have an inner diameter of 1 inch, while bearings # L44649 have an inner diameter of 1.063 inches. You can locate the bearing numbers on the bearings themselves, or you can measure the diameter using the image I've attached. We offer two hub assembly kits with # L44643 bearings. Item # 8-258BTUC1 is the standard hub assembly kit, which includes lug nuts, inner bearings and race, outer bearings and race, grease...
    view full answer...
    Image 1 for
  • Replacement Idler Hub for Bassmaster Boat Trailer
    We do offer a few idler hubs that may work for you. Since the hubs we offer can vary per the bearings and races and seals they fit you will want to make sure you get the correct replacement. The easiest way to find the right replacement is to check the numbers on the hub components as noted in the attached photo. We can then find the correct hub that is designed to work with that specific bearing, race, and seal. If you are unable to find the numbers on the parts, you will want to use...
    view full answer...
    Image 1 for
  • Bearing Buddy Recommendation For 2000-LB Axle Hub Assembly
    For the Dexter Trailer Hub Assembly, part # 8-258-50BTUC1, the Bearing Buddy you would need is part # BB1980A-SS. This fits a hub bore of 1.980 inches. The Bearing Buddy system will keep water and dirt out of hubs and bearings while allowing the boat trailer wheels to be completely submerged.
    view full answer...
  • How to Select Replacement Trailer Hubs for Old Boat Trailer
    The key to using alternate hubs on an existing axle's spindles is matching up the set of bearings in the two hubs. A new hub must use the same inner and outer bearing and grease seal as the old hub in order for it to fit properly on the spindles. If you can find a hub that uses the same bearings then you can take advantage of newer and more readily available parts. The photo I linked for you shows the typical appearance of bearing and seal part numbers. If you remove one of your hubs,...
    view full answer...
    Image 1 for
  • Spindle Recommendation for Fitting a Galvanized Hub on a Trailer
    We have a 2,000 lb axle capacity hub that is galvanized as part # 8-258-50BTUC1. For a spindle that will fit this hub the part # TRU94FR would be what you'd need.
    view full answer...
  • Replacement Idler Hub For A 2,000 Pound Dexter Trailer Axle
    There are two different options of idler hubs that we have available for a 2,000 pound axle. You will have to first let us know what your bolt pattern is which I will link a link below to help you find out what your pattern is. Next we will need to know what your inner and outer bearing numbers are on your current hubs. I will link that below as well. The two bolt patterns that we have are the 5 on 4-1/2 and the 4 on 4. The two options for outer bearings would be # L44643 and # L44649....
    view full answer...
  • Determining Correct Replacement Hub For Karavan Single Jet Ski Trailer W/ Single Axle and 13 Wheels
    I would be happy to help! To determine the correct replacement idler hubs for your Karavan single jet ski trailer with a single axle you will need to determine the bearing combination your spindle uses. The easiest way to do this is by removing one of your current hubs and looking for the bearing numbers stamped in the face of both the inner and outer bearings as shown in the included picture of the # L44649. If your bearings are worn to the point that you cannot read the bearing numbers...
    view full answer...
    Image 1 for Image 2 for Image 3 for Image 4 for

Do you have a question about this Trailer Hubs and Drum?

  • Why

    At we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer hubs and drum information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Lisa S
Written by:
Lisa S
Employee Alexander C
Updated by:
Alexander C
Employee Mike S
Updated by:
Mike S

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.