Pressed Steel Cage is the cage, which spaces the rolling elements and keeps them from touching each other — the standard cage of volume bearing production: light, cheap, tolerant of temperature and unaffected by the oils that age a polymer cage. On a sn500 series split plummer blocks that matters because as the rings — it relies on the lubricant and the seals. The property data, the comparison against the alternatives and the size table are below.
Why Pressed Steel Cage for SN500 Series Split Plummer Blocks
The standard cage of volume bearing production: light, cheap, tolerant of temperature and unaffected by the oils that age a polymer cage. In a sn500 series split plummer blocks it is the cage, which spaces the rolling elements and keeps them from touching each other.
Pressed from sheet and guided by the rolling elements, it adds almost no mass and almost no cost, tolerates a wide temperature range, and is unaffected by lubricant chemistry. It is the default cage of the standard bearing ranges for good reasons.
Material Properties
| Grade designation | low-carbon sheet steel, two-piece riveted or ribbon type, rolling-element guided |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | Not the limiting element; the lubricant and the ring heat stabilization decide |
| Corrosion characteristic | As the rings — it relies on the lubricant and the seals |
Service Limits
It is a light-duty cage: it is guided by the rolling elements and it is not intended for heavy vibration, high acceleration or sustained very high speed, which is where the machined brass cage takes over. In a heavily shocked application, cage damage rather than raceway fatigue is what ends the bearing.
What the Material Changes About the Bearing
The cage carries no load, so it changes no rating. What it changes is the operating envelope: the maximum temperature, the maximum speed, the tolerance of shock and vibration, the noise, and the compatibility with the lubricant. A bearing is very often limited by its cage long before its rings are in any danger, which is why the cage suffix in a designation is not a detail.
Sizes of SN500 Series Split Plummer Blocks Available in Pressed Steel Cage
| Designation | For bearing (adapter sleeve) | Shaft diameter range (mm) |
|---|---|---|
| SN505 | 1205K or 2205K (H305) | 20 |
| SN506 | 1206K or 2206K (H306) | 25 |
| SN507 | 1207K or 2207K (H307) | 30 |
| SN508 | 1208K or 2208K (H308) | 35 |
| SN509 | 1209K or 2209K (H309) | 40 |
| SN510 | 1210K or 2210K (H310) | 45 |
| SN511 | 1211K or 2211K (H311) | 50 |
| SN512 | 1212K or 2212K (H312) | 55 |
| SN513 | 1213K or 2213K (H313) | 60 |
| SN515 | 1215K or 2215K (H315) | 65 |
| SN516 | 1216K or 2216K (H316) | 70 |
| SN517 | 1217K or 2217K (H317) | 75 |
| SN518 | 1218K or 2218K (H318) | 80 |
| SN520 | 1220K or 2220K (H320) | 90 |
| SN522 | 1222K or 2222K (H322) | 100 |
| SN524 | 2224K (H3124) | 110 |
