Spherical Air Bearings SRA100-R15 / 620-39115

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This compact spherical air bearing supports frictionless rotary motion in three axes. With the sphere weighing only 0.2 lbs, this bearing allows for system assemblies requiring low inertia. Best designed for the lightest of loads, it also has the smallest drag torque. 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] 75 [330]
Side Load Capacity, lbs[N] 20 [88]
Stiffness, lbs/inch [N/µm] 410000 [71]
Flow Rate, scfh [slpm] 4.0 [1.9]
Air gap, microinches [µm] 200 [5]
Natural Frequency*, Hz 231
Drag Torque at 30 rpm, oz-in [N-m] 5.81E-05 [4.10E-07]
Physical Properties:
Base Diameter, inches [mm] 2.2 [56.1]
Bearing Height, inches [mm] 1.8 [45.7]
Pedestal Adapter Height, inches [mm] NA
Spherical Radius inches [mm] 25.4 [1.0]
Rotational Travel, deg 15
Sphere mounting bolt circle diameter, inches [mm] 1.181 [0.0]
Sphere mounting thread, Unified M5 [10-32]
Air Supply fitting thread, imperial [metric] M3
Material Aluminum
Assembly Weight, lbs [N] 0.590 [2.6]
Sphere Weight, lbs [N] 0.200 [0.9]
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:
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