Two boxes, two completely different jobs, and nearly the same price. One holds six cam follower roller bearings built for rolling along a track while carrying a load. The other holds twelve LM25UU linear bearings sized for 25mm shafts sliding smoothly along a rail. If you're stocking a maintenance shelf or planning a machine build, the right pick depends on the motion your equipment actually needs.
Quick Verdict
Choose the RBC S48L set if your application uses cam followers-rollers that ride on flat tracks, guide rails, or cam plates. The $40 price buys six 1.5-inch roller bearings with flat rollers and 1.5-inch studs, though they are open-box and sold as-is with no warranty or returns. Choose the LM25UU set for linear motion projects like a CNC or 3D printer axis. For $39.95 you get twelve 25x40x59mm linear bearings with a 25mm bore, a one-year manufacturer warranty, and new condition.
At a Glance
| Set | Price | What's included | Key specs | Best for |
|---|---|---|---|---|
| RBC BearingCompany Industrial Cam Follower Roller Bearings, PN# S48L | USD 40.00 | 6 bearings | 1.5 in roller dia, flat roller, 1.5 in stud dia | Cam tracks and guide rail followers |
| Industrial LM25UU Linear Bearings, 25x40x59mm, 12 Pieces CNC Compatible | USD 39.95 | 12 bearings | 25mm bore, 40mm OD, 59mm length | Linear shafts and CNC-style axes |
Where Each Product Wins
RBC S48L is the pick when your machine uses cam motion. You get a six-piece lot of industrial cam follower roller bearings from RBC Bearings Corp, sized with a 1.5-inch roller diameter and a matching 1.5-inch stud. The flat roller shape suits surfaces that the bearing contacts directly. Just be prepared for the open-box, as-is condition with no warranty and no returns.
LM25UU is the pick for linear travel. Twelve bearings in this pack, each measuring 25x40x59mm with a 25mm bore, are compatible with CNC-style linear shafts. They arrive new with a one-year manufacturer warranty and are made in the United States. If your build needs smooth sliding motion rather than rolling around a cam, these cover it at $39.95.
Product Notes
RBC BearingCompany Industrial Cam Follower Roller Bearings, PN# S48L
The main draw here is the lot count: six cam follower roller bearings for $40, or about $6.67 per bearing. Each has a 1.5-inch roller diameter, a flat roller shape, and a 1.5-inch stud diameter, which makes them a straightforward match for cam track and guide rail builds. The set comes in original RBC boxes that were opened before this sale, and the bearings are in new open-box condition. The trade-off is significant: they are sold as-is with no warranty and no refunds. That means you want to inspect them before putting them into a critical machine. For a quantity buy at essentially the same price as the LM25UU pack, they're the clear choice when the job is rotary cam following rather than linear motion.
Industrial LM25UU Linear Bearings, 25x40x59mm, 12 Pieces CNC Compatible
For linear motion, this pack gives you twelve LM25UU bearings for $39.95, which comes out to roughly $3.33 per bearing. Each unit has a 25mm bore, 40mm outer diameter, and 59mm total length, and they are explicitly described as CNC compatible, meaning they should fit standard 25mm linear rail systems and shaft supports. The bearings are new, covered by a one-year manufacturer warranty, and made in the United States. There is no dispute about the motion type: these are for shafts that slide in a straight line, not for cam follower duty. If your project involves a CNC router, 3D printer axis, or any linear slide, this set gives you a complete twelve-bearing complement for slightly less than the RBC lot.
Final Choice by Use Case
Use the RBC S48L cam followers when you need bearings that roll along a cam surface, track, or guide rail. Use the LM25UU linear bearings when you need smooth linear travel on 25mm shafts. The price gap is just five cents, so the decision rests entirely on the motion your machine needs.
