When you are working in bearings, couplings, and power transmission, one shaft can present two opposite problems: it needs to rotate smoothly, or it needs to be held firmly in position. Those jobs call for different hardware. The Uxcell 604ZZ deep groove ball bearings are for the first job; Summit Collars face flange mounted shaft collars are for the second. The decision comes down to what each part actually does, what it costs, and which one belongs in your cart.
Quick Verdict
If the shaft must spin inside a small motor, gearbox, printer, fan, or hobby machine, the Uxcell 604ZZ sealed bearing set is the direct fix. If the shaft must instead be clamped to a hub or mounting plate, the Summit face flange mounted shaft collar is the part that solves that problem. They are not interchangeable, and the better purchase depends on the job you are solving.
Price and Fit at a Glance
| Part | Listed Price | Price Bar | Best For |
|---|---|---|---|
| Uxcell 604ZZ Deep Groove Ball Bearings | USD 17.75 | Rotating shafts in compact motors, gearboxes, appliances, and hobby equipment | |
| Summit Face Flange Mounted Shaft Collars | USD 38.65 | Locking a shaft to a flange or hub with multiple bolting points |
Where Each Product Wins
- The Uxcell bearing set wins when you need low-friction support for a rotating shaft. It comes as eight identical 604ZZ bearings, so you can replace several worn units or keep spares. The 4x12x4mm size and metal-sealed construction fit a range of compact, general-purpose machines.
- The Summit Collars option wins when you need to mount a shaft to a face plate or hub. The three tapped counterbored holes and three unthreaded holes make bolting flexible, and the clamp holds evenly around the shaft without marring it. You can pick aluminum for lighter weight or steel for greater strength.
Product Notes
#### Uxcell 604ZZ Bearing Set
The case for this set is its combination of size and quantity. You get eight metal-sealed 604ZZ bearings with a 4mm bore, 12mm outer diameter, and 4mm width, made from bearing steel with a polished surface. That makes them a practical fit for miniature gearboxes, small motors, power tools, printers, copiers, fans, mixers, juicers, treadmills, CNCs, and remote control cars. If your machine has several of these bearings, one pack can cover multiple replacements. Where it falls short: a bearing supports rotation, it does not stop a shaft from sliding along its axis. This set cannot clamp, position, or couple a shaft to a mounting plate. Its small 4mm bore also points to compact machines rather than large shafting.
#### Summit Face Flange Mounted Shaft Collars
What makes this Summit Collars option useful is the mounting flexibility in the flange. Three tapped counterbored holes and three unthreaded holes let you bolt the hub collar to a face in several orientations. The collar clamps evenly around the shaft to create a strong, mar-free hold, and the design is available in aluminum or steel, with the specific variant carrying a 1-inch inside diameter in aluminum black anodize. Aluminum keeps weight down and offers good corrosion resistance; black-oxide steel gives a stronger option. The trade-off is the job itself: a shaft collar is built to hold or couple a shaft, not to let it spin freely. If you need smooth rotation under load, this is the wrong part.
Final Choice by Use Case
Choose the Uxcell 604ZZ set when the shaft has to rotate inside a small motor, gearbox, printer, fan, mixer, or hobby machine and you want a handful of sealed bearings ready to install. Choose the Summit face flange mounted shaft collar when the shaft has to be bolted to a hub or face plate and held in one position. If the same machine needs both, keep the bearing on the rotating end and the collar on the fixed end; each part is doing the job the other cannot.
