What This Seal Is and Where It Lives
This is a trailer axle wheel seal, not a truck seal - it sits behind the hub, between the spindle and the hub bore, keeping oil in and dirt/water out. The 4.625" x 6" size (that's the shaft bore x the OD) is one of the most common trailer hub seal sizes out there, which is why it crosses to so many part numbers.
SKF sells it as OS0159. Meritor's number is 46300, and that's what most fleets call it out by since Meritor axles are everywhere on van and reefer trailers. If your hub is weeping oil around the seal area or you're doing a bearing service, this is the seal you replace - every time, no exceptions, don't reuse an old one.
Why All These Numbers Cross and What to Double-Check
Meritor made this seal design standard across a bunch of their trailer axle families, and other manufacturers built to the same bore/OD spec, so you get this long list - 46305, 309-0973, 392-9131, the Alliance numbers, the Stemco-style 9263/9292/9300 prefixes. They're all the same physical seal size doing the same job, just packaged and numbered differently by whoever's selling it.
The number that matters is stamped or printed on the old seal, or cast into the hub if you can read it. Don't go off what's on the axle tag alone - some axles got running changes mid-production. Pull the old seal, check the size and any numbers on it, then match it against this list.
One thing to watch: seal size is only half the story. Some of these applications also spec a matching bearing cone, and a seal that's the right OD but wrong lip design will still leak even if it seats fine. If you're not 100% sure, bring the old part in or give us the VIN and axle tag info and we'll confirm before you buy.
Ordering From PartStop
$85.99, and we keep these in stock at the Tacoma counter - if you're local and need it same day for a trailer down in the yard, come grab it or we'll get it out for will-call fast. Ship nationwide too if you're not close by.
6+ month warranty on it. It's a seal, so install it right - clean bore, proper seating tool, don't hammer it in crooked - and it'll do its job. Any fitment questions before or after the sale, that's what the counter's for.
46300 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 46300. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| OE/Cross-Ref | 46305, 309-0973, 392-9131, 370003A, 380003A, MER0243 |
| Alliance | 10045888, 10045889, 10082954 |
| Aftermarket | 9263 370025A, 9292 3070743, 9292 3710043, 9292 3727097, 9300 46304, 9300 46305, 46300 C24, 504859, 370024A, 370025A |
Frequently asked questions
Does 46300 fit my trailer axle?
Probably, if it's a Meritor-spec trailer axle with a 4.625" x 6" hub seal bore, but 'probably' isn't good enough for a seal - pull the old one and check the size and stamped number, or give us the axle tag/VIN and we'll verify before you order.
Is this the same as the Alliance 10045888 seal?
Same size and application, both cross to this 4.625" x 6" spec, but they're different manufacturers' part numbers for what's built to the same fit. Confirm against your old seal's markings rather than assuming brand-for-brand interchangeability.
Do I need to replace the bearings when I put this seal in?
Not automatically, but if you're already in there for a seal leak, it's worth pulling the cones and races to check for wear or pitting - a bad bearing will chew through a new seal fast and you'll be back doing this job again in a month.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.