Spherical Air Bearings SRA100-R45 / 620-39117

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This compact spherical air bearing supports frictionless rotary motion in three axes. With the sphere weighing only 0.4 lbs, this bearing allows for system assemblies requiring low inertia. Best designed for the load less than 69 pounds, it has the smallest drag torque of the SRA series spherical air bearings. 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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User Instructions
Comparison Table
Load Capacity, lbs[N] 69 [304]
Side Load Capacity, lbs[N] 18 [79]
Stiffness, lbs/inch [N/µm] 350000 [61]
Flow Rate, scfh [slpm] 3.8 [1.8]
Air gap, microinches [µm] 200 [5]
Natural Frequency*, Hz 223
Drag Torque at 30 rpm, oz-in [N-m] 4.53E-05 [3.20E-07]
Physical Properties:
Base Diameter, inches [mm] 2.2 [56.1]
Bearing Height, inches [mm] 2.6 [66.8]
Pedestal Adapter Height, inches [mm] NA
Spherical Radius inches [mm] 25.4 [1.0]
Rotational Travel, deg 45
Sphere mounting bolt circle diameter, inches [mm] 0.750 [0.0]
Sphere mounting thread, Unified M5
Air Supply fitting thread, imperial [metric] M3
Material Aluminum
Assembly Weight, lbs [N] 0.800 [3.5]
Sphere Weight, lbs [N] 0.400 [1.8]
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
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