What This Seal Is and Where It Lives
This is a wheel hub oil seal, the part that keeps bearing grease or oil in the hub and road grime out. It sits behind the hub cap, pressed into the hub bore against the spindle. On trailer axles running 4.625" bore by 6" shaft diameter, this size shows up constantly across Hendrickson, Dana/Eaton, and generic trailer axle hubs from the 90s through current production.
When these fail you get grease flung on the inside of the wheel, sometimes on the brake drum, and eventually a dry bearing that overheats. Cheap part, expensive failure if you let it go.
This isn't specific to one trailer brand — it's a size and design that a bunch of manufacturers built around, which is why you see it under Scotseal, National, Stemco, and generic aftermarket numbers all pointing at the same physical seal.
Why All These Numbers Cross to the Same Seal
Scotseal's OS0218 and National's 370025A are the two numbers you'll hear counter guys reference most, and 46305 is often the number cast right into the seal body itself on aftermarket units. Stemco has three numbers listed here — 3070743, 3707007, 3707043 — because they've run slightly different part number generations for what's still the same 4.625 x 6 dimension.
The thing to verify before you order: bore diameter, shaft diameter, and seal lip design (some are single lip, some double lip for oil-lubed axles vs grease). Get those three matched and the brand name on the box doesn't matter much — it's a wear part, not something with proprietary geometry.
If your old seal is unmarked or worn past reading, pull it and measure the OD and ID with calipers, or just bring it to the counter. Matching physical dimensions beats guessing off a catalog page every time, especially on trailer axles where three or four builders may have used the same hub.
Ordering From PartStop
We keep 46305 in stock at the Tacoma counter — same-day if you're local and need the trailer back on the road. Ship nationwide too if you're ordering ahead of a PM or restocking the shop.
At $61.99 it's not the kind of part you want to order twice, so confirm your VIN or axle tag, or better yet bring in the old seal and we'll match it before it leaves the counter.
Comes with our standard 6+ month warranty. It's a direct replacement for the numbers listed, not a guaranteed fit sight unseen — trailer axle variance is real, so confirm before you install.
46305 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 46305. 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 |
|---|---|
| SKF Scotseal | OS0218 |
| National Seal | 370025A |
| Stemco | 3070743, 3707007, 3707043 |
| Mechanex | 755400 |
| POA | 513 |
| Aftermarket | 10003889, 10005436, 10045888, 1005503, 10600013, 10600343, 107553 |
Frequently asked questions
Does 46305 fit my Hendrickson trailer axle?
Likely, if your hub bore is 4.625" and shaft is 6" — that's the common Hendrickson trailer spec this seal was built for. But axle suppliers change specs across model years, so check your axle tag or measure the old seal before ordering.
Is this the same as the Stemco 3707007?
Same physical seal dimensions, yes — Stemco just runs their own numbering across a few part number generations for this size. Confirm bore and shaft measurements match your hub before swapping brands.
How do I know if I need single lip or double lip design?
Depends on whether your axle runs grease or oil lubrication in the hub. Oil-lubed axles typically need the double lip seal to hold up under the different viscosity. Check your maintenance manual or ask at the counter with your axle info handy.
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.