Spherical Air Bearings SRA250-R30 / 620-39225

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This 2.5 inch radius spherical air bearing carries 510 pounds of load with a high stiffness of 2 million pounds per inch. The frictionless rotary motion of spherical air bearings makes them ideal for satellite simulation, semiconductor wafer-plane alignment and a variety of other applications. 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.

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Comparison Table
Load Capacity, lbs[N] 510 [2244]
Side Load Capacity, lbs[N] 160 [704]
Stiffness, lbs/inch [N/µm] 2000000 [346]
Flow Rate, scfh [slpm] 5.9 [2.8]
Air gap, microinches [µm] 200 [5]
Natural Frequency*, Hz 196
Drag Torque at 30 rpm, oz-in [N-m] 3.54E-03 [2.50E-05]
Physical Properties:
Base Diameter, inches [mm] 5.5 [139.7]
Bearing Height, inches [mm] 4.2 [107.2]
Pedestal Adapter Height, inches [mm] NA
Spherical Radius inches [mm] 63.5 [2.5]
Rotational Travel, deg 30
Sphere mounting bolt circle diameter, inches [mm] 2.125 [0.1]
Sphere mounting thread, Unified 3/8-16
Air Supply fitting thread, imperial [metric] M5 [10-32]
Material Aluminum
Assembly Weight, lbs [N] 8.700 [38.3]
Sphere Weight, lbs [N] 4.000 [17.6]
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
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