In a sn500 series split plummer blocks, Machined Brass Cage is the cage, which spaces the rolling elements and keeps them from touching each other. The grade is machined cast or wrought brass, rolling-element or ring guided (suffix M, MA, MB or MP by maker); it is non-magnetic, and its usable service range is the cage itself is good well past the temperature at which the lubricant and the ring stabilization give out. This page covers what the material changes about the bearing, the limits it brings with it, and the sizes supplied.
Why Machined Brass Cage for SN500 Series Split Plummer Blocks
Specified for large bearings, high speed, heavy shock and vibration, and wherever temperature or lubricant rules out polyamide. In a sn500 series split plummer blocks it is the cage, which spaces the rolling elements and keeps them from touching each other.
A machined brass cage is strong, stable at temperature, and unaffected by the oils and additives that age a polymer cage. It is what large bearings, high-speed bearings and heavily shocked bearings are supplied with.
Material Properties
| Grade designation | machined cast or wrought brass, rolling-element or ring guided (suffix M, MA, MB or MP by maker) |
|---|---|
| Magnetic response | Non-magnetic |
| Service temperature | The cage itself is good well past the temperature at which the lubricant and the ring stabilization give out |
| Corrosion characteristic | Good in most industrial environments; brass is attacked by ammonia, so it is not used in ammonia refrigeration plant |
Service Limits
Brass is attacked by ammonia, so a brass-caged bearing has no place in an ammonia refrigeration plant. The machined cage also weighs more than a pressed or moulded one, which matters for acceleration and for the cage forces at very high speed.
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 Machined Brass 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 |
