Castair Rubber Cushion Base Mount 140mm Heavy Duty (RCBM140HU)
The Castair RCBM140HU is the 140mm heavy-duty rubber cushion base mount — the largest and highest-rated mount in the RCBM series. The HU (heavy-duty) designation paired with the 140mm diameter puts this mount at the top of the lineup for load capacity and footprint coverage. This is the mount you reach for when installing larger rotary screw compressors with heavy frames where neither the 100mm mounts nor the standard-load 140mm DC mount provides adequate load capacity or isolation performance.
Specific load ratings, deflection specifications, and bolt patterns for the RCBM140HU were not published on castair.net at time of writing. Call us at 866-217-0063 — provide your compressor model, total weight, and base foot dimensions and we can confirm whether the RCBM140HU is the correct specification for your installation.
Mount Specifications
- Part number: RCBM140HU
- Diameter: 140mm
- Configuration: Heavy Duty (HU)
- Material: Heavy-duty rubber bonded to steel
- Application: Heavy air compressor vibration isolation — largest frames, highest loads
- Load rating: Contact 866-217-0063 for confirmed specifications
RCBM Series Selection Guide
- RCBM100DC: 100mm, double-cup — lighter compressors, standard load
- RCBM100HU: 100mm, heavy-duty — heavier loads on 100mm footprint
- RCBM140DC: 140mm, double-cup — larger footprint, standard load
- RCBM140HU (this part): 140mm, heavy-duty — largest footprint, maximum load capacity
For standard piston compressor installations, Castair's VP1004 flat rubber vibration pad set (4 x 4x4x1 pads) covers most installations at lower cost. The RCBM heavy-duty cup mounts are for larger rotary screw units — typically 20 HP and above — where sustained vibration loads are higher and floor isolation requirements are more demanding.
Heavy-Duty Applications
- Rotary screw compressors 20-30+ HP (900-1,065 lbs and up)
- Installations where the floor surface is uneven or not ideal for flat pad use
- Facilities with vibration-sensitive equipment nearby that requires maximum isolation from compressor vibration
- High-cycle applications running 24/7 where sustained mount loading is a concern
Why Vibration Isolation Matters for Large Compressors
- Sustained loading: A 30 HP rotary screw at 1,065 lbs running 100% duty puts sustained compressive and shear loads on mounts that flat pads cannot adequately handle long-term
- Pipe integrity: The larger the compressor, the more vibration energy transmitted to discharge piping if mounts are undersized. Always pair proper mounts with metal flex hose at the discharge connection
- Building structure: In facilities with wood-frame or older construction, correct vibration isolation at the compressor base significantly reduces structure-borne noise and vibration transmission
What Is in the Box
- 1x Castair RCBM140HU rubber cushion base mount, 140mm heavy-duty configuration
Why Buy From Air Compressor Factory Direct?
- Castair authorized: OEM mounts matched to the Castair compressor lineup
- Free shipping on qualifying orders
- Free tech support: 866-217-0063 — call with your compressor weight and we will confirm the correct mount specification
- Full installation accessory lineup: Flex hose, ball valves, vibration pads, and PM kits
Call 866-217-0063 for quick answers and help!
