Spherical Air Bearings SRA350-R30 / 620-39131

Number of Units:

The SRA350 air bearing has a stiffness of over 3 million pounds per inch and supports over 1000 pounds. Typical for the SRA series, these spherical air bearings provide smooth, frictionless rotary motion surpassing performance of the finest rolling element bearings by orders of magnitude. Deep capture of the sphere allows for a high side load capacity. Pneumatic hammering of the air film can plague an air bearing design and result in unstable bearing performance. Unlike other spherical air bearings, the SRA series eliminates this possibility by including vibration dampening features within the design.

View Accessories ▾
Drawing Download
User Instructions
Comparison Table
Load Capacity, lbs[N] 1031 [4536]
Side Load Capacity, lbs[N] 268 [1179]
Stiffness, lbs/inch [N/µm] 3500000 [606]
Flow Rate, scfh [slpm] 7.4 [3.5]
Air gap, microinches [µm] 200 [5]
Natural Frequency*, Hz 182
Drag Torque at 30 rpm, oz-in [N-m] 1.56E-02 [1.10E-04]
Physical Properties:
Base Diameter, inches [mm] 7.8 [196.9]
Bearing Height, inches [mm] 6.0 [151.7]
Pedestal Adapter Height, inches [mm] NA
Spherical Radius inches [mm] 88.9 [3.5]
Rotational Travel, deg 30
Sphere mounting bolt circle diameter, inches [mm] 3.500 [0.1]
Sphere mounting thread, Unified 3/8-16
Air Supply fitting thread, imperial [metric] M5 [10-32]
Material Aluminum
Assembly Weight, lbs [N] 25.100 [110.4]
Sphere Weight, lbs [N] 11.100 [48.8]
Installation Requirements:
Sphere Mating Surface Required Flatness, inches [µm] .002 [50]
Mating Surface Roughness, microinches [µm] 16 [0.4]
Rated Vacuum, inHg [Mpa] 20 [.06]
Rated Supply Pressure, psig [Mpa] 80 [0.55]
Max. Supply Pressure, psig [Mpa] 100 [0.69]
Air Quality ISO Class 3 or better preferred
Number of Units:
Have Questions? Click here to contact us