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When you’re hauling serious weight, you need a hub that’s up to the job. This Dexter Trailer Idler Hub Assembly is built for 10,000-lb axles and supports up to 5,000 lbs per hub. It’s designed for 12-1/4" diameter x 4" wide drums and uses a 3-1/4" inner diameter oil seal for a tight, reliable fit. The precision machining and standard-grade construction mean it handles demanding loads mile after mile.
Keeping everything tight and true starts with the right hub geometry. This model uses an 8 on 6-1/2" bolt pattern with 5/8" diameter x 1-1/16" long drive-in studs, giving you the solid wheel connection heavy trailers require. The design fits wheels from 16" through 17-1/2", so you get flexibility without compromising strength or alignment.
No guessing which parts fit. The hub takes an inner bearing (395S, 2.625" ID), outer bearing (387A, 2.250" ID), inner race (394A), outer race (382A), and oil seal (10-56) with a 3.125" inner diameter and 4.500" outer diameter—all sold separately. These clear specs make it straightforward to match your spindle and components with confidence.
Swapping or upgrading is simple since this hub uses standard Dexter parts throughout. The precision-machined bores and pre-sized stud holes make installation smooth without modification. Once paired with the correct bearings, seal, and hardware, it’s ready to roll with dependable performance that holds up under the toughest towing conditions.
1. Count the lug holes
Look at the wheel hub or the back of the wheel and count how many lug holes there are(also called bolt holes).
Common configurations include: 4-lug, 5-lug, 6-lug and 8 lug
2a. For even lug counts (4-lug, 6-lug, 8-lug)
Measure from the center of one lug hole directly across to the center of the hole opposite it.
Common configurations: 4 on 4", 6 on 5.5", 8 on 6.5"
2b. For odd lug counts (5-lug)
Measure from the center of one lug hole to the outer edge of the hole directly across (not center-to-center since there's no directly opposite hole).
Common configurations: 5 on 4.5" (most popular), 5 on 5", 5 on 4.75", 5 on 5.5"
Customer Satisfaction Score:
93% were satisfied with this product
7% of customers were not satisfied
Ratings & Reviews
If you have a light boat trailer but want to get rid of the 12 inch wheels and upgrade to 13 or 14 you will need this larger hub in order to have the proper mounting surface for the wheels while keeping your 1 inch spindles. This kit has everything needed including larger lug nuts. This gives me piece of mind knowing my hubs, bearings, wheels, and tires are not straining to haul the load.
IL N Y AVAIT PAS DE BEARING NI NUT DE ROUE , POURTANT SUR LE DESSIN IL EN A. [There was no wheel bearing or nut included, even though the diagram shows them.]
ETrailer staff was able to find a hub to fit a very old spindle from a farm buggy we pull by tractor for kids to ride. They were able to match bearing sizes and sell odd size grease seal. Old tires, wheels and hubs were shot. A friend gave 4 jeep wheels to complete the job making a cool update.
Awesome stuff. Between etrailer & Dexter we found a perfect idler hub replacement to go from demountable rims to rims w/lug nuts.
All I need now are rims & tires.
In building two tear drop trailers (see attached picture) and do to a miss measurement I ended up with two axles without hubs. (another story!) So I decided to order hub and start making a utility trailer. I enjoy etrailer's website. It is very helpful in selecting the right trailer parts. Delivery was good but the packaging was poor. The bearing, seal, lug nuts and cap are all in one bag taped to the heavy hub. One of the seal were bent but the rubber part looked OK, so I straighten it the best I could and install it anyway. I did not want to go through the hassle of returning it for a new one.
The young lady was earnestly working to resolve my needs. I would never hesitate to work with this team for all my trailer needs.
No grease cap or zerk to replace the one that came off the old hub. No way to grease other than removing the cap everytime. Not ideal for a marine trailer application. Got to find a different cap now.
I live in a very remote part of Nv. The internet is the closest shopping Within 145 miles. It is my pleasure to say you are one of the best .I got my parts and on time plus it was at a good price
Lost my part ,reordered my part very fast.No questions asked sent me my replacement part.
The product was good. The boxes that you used for shipping was marginal at best. You don't put 60 pounds of steel in a box made for greeting cards.
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Brooke M.
8/21/2022
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