Castair Rubber Cushion Base Mount 140mm Double Cup (RCBM140DC)
The Castair RCBM140DC is a 140mm rubber cushion base mount in the double-cup (DC) configuration. The step up from the 100mm RCBM100DC to the 140mm RCBM140DC gives you a larger bearing surface area under each compressor foot — useful for heavier compressor frames where you need to distribute the load over a larger contact zone, or for installations on softer flooring where point load matters. Both the DC and the 140mm designation together put this mount in the mid-tier of the RCBM series: larger footprint than the 100mm models, standard load rating compared to the HU heavy-duty versions.
Specific load ratings and bolt patterns for the RCBM140DC were not published on castair.net at time of writing. Contact us at 866-217-0063 with your compressor model, weight, and base foot dimensions to confirm the correct mount size.
Mount Specifications
- Part number: RCBM140DC
- Diameter: 140mm
- Configuration: Double Cup (DC)
- Material: Rubber bonded to steel cups
- Application: Air compressor vibration isolation — larger or heavier base frames
- Load rating: Contact 866-217-0063 for confirmed specifications
RCBM Mount Comparison
- RCBM100DC: 100mm, double-cup — standard, mid-size compressors
- RCBM100HU: 100mm, heavy-duty — higher load, 100mm footprint
- RCBM140DC (this part): 140mm, double-cup — larger footprint, standard load rating
- RCBM140HU: 140mm, heavy-duty — largest footprint, maximum load rating
140mm vs. 100mm — When Does the Larger Size Apply?
The 140mm mount is typically used with larger compressor frames where the base feet have a wider bolt pattern or larger pad area than what the 100mm mount accommodates. It also provides better load distribution on installations where the concrete or floor surface condition is not ideal. If your compressor is 15 HP or larger (rotary screw models over 750 lbs), the 140mm footprint is worth considering over the 100mm series for the increased stability.
Why Proper Vibration Isolation Matters
- Continuous service: Rotary screw compressors run continuously — vibration mounts must handle sustained compressive and shear loads without degrading
- Pipe safety: Cup-style mounts allow a small amount of movement — always connect the compressor discharge to fixed shop piping with a metal flex hose to prevent pipe fatigue cracking
- Noise control: Larger 140mm mounts with adequate rubber mass provide meaningful attenuation of low-frequency vibration that flat pads may not fully address on larger machines
- Floor protection: Distributing compressor weight over a larger rubber contact area reduces PSI on the floor surface and reduces concrete cracking risk over years of continuous operation
What Is in the Box
- 1x Castair RCBM140DC rubber cushion base mount, 140mm double-cup configuration
Why Buy From Air Compressor Factory Direct?
- Castair authorized: OEM mounts matched to Castair compressor installations
- Free shipping on qualifying orders
- Free tech support: 866-217-0063 — sizing guidance on 100mm vs. 140mm and DC vs. HU
- Full accessory lineup: Flex hose, ball valves, PM kits, and all Castair installation accessories
Call 866-217-0063 for quick answers and help!
