When you hear grinding at the wheel, see oil leaking from the hub, or notice play in the tire, it might be time for repairs. This idler hub fits 16,000-lb heavy-duty axles and uses an oil bath system for visible lubrication monitoring under load.
A lot of the confusion in this category comes from ordering a brake-style assembly when you actually need an idler hub, then realizing it after teardown. This is an idler trailer hub assembly, built to serve idler axles. You get a hub assembly that matches the idler role, so the swap stays focused on restoring rolling function rather than dragging brake parts into a job that doesn't need them.
Hub swaps usually go sideways at the wheel interface because 8-lug isn't a single standard and close measurements don't bolt up. This hub uses an 8 on 275mm bolt pattern with a 22mm wheel bolt diameter, so the wheel and hardware match has to be exact. When your wheel and studs actually share the same pattern and stud size, the wheel seats correctly and you avoid any speedbumps in the installation.
Before starting the install, confirm the rest of your parts list. This hub ships without bearings, oil seal, oil cap, and lug nuts (sold separately). Having those components ready prevents disassembly delays and keeps the job moving from teardown to final torque in one pass.
This oil bath trailer hub uses an oil-lubricated setup that lets you check fluid level and condition without tearing everything apart. A quick visual check becomes part of your routine instead of a full disassembly, making it easier to stay ahead of wear during long hauls and repeated use.
That same practical approach carries into the construction. The hub body is iron with a galvanized finish, built to handle water exposure, road salt, and the grime that comes with heavy service. The oil bath design helps you monitor what's happening inside, and the galvanized exterior helps the outside hold up to the environment it works in.
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.
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.)
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.)
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.
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi everybody, Andy here with etrailer. Let's take a quick look at this DMAX Galvanized trailer hub assembly for your heavy duty 15K axles. Now this trailer hub assembly is designed for heavy duty idler axles and it serves as a direct replacement for the hub and drum assembly that you see there identified by that model number. This is built from sturdy iron, so it's very well built. It's robust, it's heavy, so it's made to handle demanding use and it's gonna give you long-term durability. This is intended for 15,000 pound heavy duty axles, as I said at the beginning of our time together.
And this is going to give you a 7,500 pound capacity per hub, and the bolt pattern is eight on 275 millimeter, and it uses 22 millimeter wheel bolts. So this is gonna be compatible with many commercial, industrial heavy trailer setups. Now this hub does come with the enter and outer races already installed, but you will need to supply your own bearings, oil steel, and oil cap, and lug nuts. On your screen I am including the bearing sizes that you are going to need. So you see the numbers there on your screen and you can find all those items and more here at etrailer.
But overall, this is gonna be a solid, heavy duty replacement option for anyone needing a reliable idler hub that's going to fit those 15 K axles that matches that number that you see there on your screen. If you happen to have any other questions, whether it's about this or anything else that we carry here at etrailer, don't hesitate to reach out. We wanna make sure that you're getting exactly what you need. Well, again, my name's Andy. Thank you for joining me.
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