Castair Rubber Cushion Base Mount 100mm Double Cup (RCBM100DC)
The Castair RCBM100DC is a 100mm rubber cushion base mount in the double-cup (DC) configuration. Rubber vibration mounts are a non-negotiable part of a properly installed air compressor — they isolate compressor vibration from the floor and from the shop structure, reducing noise transmission, preventing floor fatigue cracking over time, and protecting both the compressor frame and your building from cumulative vibration stress.
The double-cup (DC) design uses rubber bonded between two metal cups — the inner cup bolts to the compressor base, the outer cup contacts the floor. This configuration provides both compression and shear isolation, giving more effective vibration damping compared to a simple flat rubber pad. The 100mm designation refers to the mount diameter. Specific load rating, bolt pattern, and maximum load specifications for the RCBM100DC were not available from manufacturer pages at time of writing — contact us at 866-217-0063 for confirmed specs if you are sizing mounts for a specific compressor application.
Mount Specifications
- Part number: RCBM100DC
- Diameter: 100mm
- Configuration: Double Cup (DC)
- Material: Rubber bonded to steel cups
- Application: Air compressor vibration isolation — base mounting
- Load rating and bolt pattern: Contact 866-217-0063 for confirmed specifications
Double Cup vs. Heavy Duty — Which Mount Do You Need?
- RCBM100DC (this part): 100mm, double-cup — standard vibration isolation for mid-size compressors
- RCBM100HU: 100mm, heavy-duty — higher load capacity for heavier compressor frames
- RCBM140DC: 140mm, double-cup — larger footprint for bigger base frames
- RCBM140HU: 140mm, heavy-duty — maximum load capacity in the 140mm size
For context, Castair also sells the flat VP100 rubber vibration pad (4"x4"x1", sold individually as VP100 or in a set of 4 as VP1004) for standard piston compressor installations. The RCBM-series cup mounts are for applications requiring more engineered vibration isolation than a flat pad provides.
Why Proper Vibration Isolation Matters
- Noise reduction: Rubber mounts prevent compressor vibration from resonating through concrete floors and walls — reducing shop noise levels noticeably
- Floor protection: Rotary screw compressors run continuously. Unchecked vibration on concrete causes micro-cracking over time, particularly around anchor points
- Compressor longevity: Hard-mounting a compressor allows vibration energy to cycle back into the machine frame and fittings — leading to fatigue cracks in copper lines, loose fittings, and accelerated wear
- Piping protection: Flexible mounts allow a small amount of movement between the compressor and the fixed shop piping — this is why Castair also sells metal flex hose as a companion accessory
Installation Notes
- Use one mount per compressor foot/base pad location — typically 4 mounts per unit
- Do not over-torque the mounting bolts — compressing the rubber element past its rated deflection reduces isolation effectiveness
- Pair with metal flex hose (VA075, VA100, or VA125 depending on line size) between the compressor discharge and fixed shop piping to allow the mounts to work properly
What Is in the Box
- 1x Castair RCBM100DC rubber cushion base mount, 100mm double-cup configuration
Why Buy From Air Compressor Factory Direct?
- Castair authorized: OEM vibration mounts matched to Castair compressor installations
- Free shipping on qualifying orders
- Free tech support: 866-217-0063 — help sizing and selecting the correct mount for your compressor
- Full accessory lineup: Mounts, flex hose, ball valves, and installation kits available
Call 866-217-0063 for quick answers and help!
