Trailer bearings are sold by number, and the numbers are the same whoever made the bearing. A Timken L44649 fits where any L44649 fits. That makes the number the thing to get right. This page lists the four Timken cone numbers that cover most 3,500 to 7,000 lb trailer axles, the race (cup) each one runs in, and the look-alike numbers that catch people out.
The short answer
| Cone (bearing) | Cup (race) | Bore | Cup OD | Position | Axle | RVPG kit |
|---|---|---|---|---|---|---|
| L44649 | L44610 | 1-1/16 in | 1.980 in | Outer | 3,500 lb | 10-inch Timken kit |
| L68149 | L68111 | 1.3775 in (1-3/8 nominal) | 2.361 in | Inner | 3,500 lb | 10-inch Timken kit |
| 14125A | 14276 | 1-1/4 in | 2.717 in | Outer | 5,200 to 7,000 lb | 12-inch Timken kit |
| 25580 | 25520 | 1-3/4 in | 3.265 in | Inner | 5,200 to 7,000 lb | 12-inch Timken kit |
Each kit covers one hub: both cones, both cups, the grease seal (10-19 on the 10-inch kit, 10-36 on the 12-inch kit) and grease. Timken also sells the L44649 cone with its L44610 cup as SET4, so a SET4 is the outer half of the 10-inch kit.
Cone vs cup: L44649 vs L44610
This is the most searched "vs" in trailer bearings, and the answer is that they are not alternatives. They are two halves of one bearing.
- The cone (L44649) is the part with the rollers and cage. It sits on the spindle, and it is what you pack with grease.
- The cup (L44610), also called the race, is the hardened ring pressed into the hub. The rollers run on it.
They wear together, so they are replaced together. Never run a new cone in an old cup. Our repack guide explains why.
Look-alikes that are not the same part
L44649 vs L44643
Both run in the same L44610 cup, so the hub does not tell them apart. The difference is the bore: the L44649 is 1-1/16 in, the L44643 is 1 in. A 1-in spindle needs the L44643; a 1-1/16-in spindle needs the L44649. Read the number stamped on the old cone, or measure the spindle, before you order.
L68111 vs L68110
Both are cups for the L68149 cone, but they have different outside diameters (about 2.361 in for the L68111 and about 2.328 in for the L68110). The cup has to match the hub bore it came out of. Read the number on the old cup; the 10-inch kit contains the L68111.
14125A vs 15123
Both are outer cones with a 1-1/4 in bore, so either slides onto the spindle. Their cups are different: the 14125A runs in a 14276 cup (2.717 in OD), the 15123 in a 15245 cup (2.441 in OD). The hub is machined for one cup or the other, so a hub built for 15123 needs a 15123, and fitting the larger 14125A does not raise the axle's rating. The 12-inch kit contains the 14125A/14276.
How to find your number
- Read the old parts. Every Timken cone has its number on the large face, and every cup has its number on the edge. This is the only certain answer.
- Measure the drum. A tape across the brake drum reads close to 10 in (3,500 lb, L68149 + L44649) or close to 12 in (5,200 to 7,000 lb, 25580 + 14125A).
- Read the axle plate. The rating points to the row in the table above.
Our bearing kit by axle rating guide covers the 2,000 lb boat-trailer axle and lug patterns, and the Black Series bearing size guide covers HQ campers.
What to order
- 3,500 lb axles (10-inch drums): Small Bearings, 10-inch Timken kit (L68149/L68111 + L44649/L44610, 10-19 seal)
- 5,200 to 7,000 lb axles (12-inch drums): Big Bearings, 12-inch Timken kit (25580/25520 + 14125A/14276, 10-36 seal)
One kit per hub: two for a single axle, four for a tandem. If your old parts carry a number not on this page, send us a photo of the stamping and we will tell you plainly whether we have it. Everything ships from Upland, California.