Spherical Air Bearings SRA200-R30 / 620-39224

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The 2 inch radius SRA200 air bearing allows continuous 360 degree rotation about the yaw axis and +/-30 degrees about the pitch and roll axes. The SRA series bearings can be fitted with a vacuum pocket allowing for preload and locking of the sphere. With a nominal air gap of 5 microns, the SRA series exhibit zero wear of the mating surfaces. 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] 318 [1399]
Side Load Capacity, lbs[N] 101 [444]
Stiffness, lbs/inch [N/µm] 1300000 [225]
Flow Rate, scfh [slpm] 4.7 [2.2]
Air gap, microinches [µm] 200 [5]
Natural Frequency*, Hz 200
Drag Torque at 30 rpm, oz-in [N-m] 7.08E-04 [5.00E-06]
Physical Properties:
Base Diameter, inches [mm] 4.4 [111.8]
Bearing Height, inches [mm] 3.3 [83.6]
Pedestal Adapter Height, inches [mm] NA
Spherical Radius inches [mm] 50.8 [2.0]
Rotational Travel, deg 30
Sphere mounting bolt circle diameter, inches [mm] 1.750 [0.0]
Sphere mounting thread, Unified 3/8-16
Air Supply fitting thread, imperial [metric] M5 [10-32]
Material Aluminum
Assembly Weight, lbs [N] 4.400 [19.4]
Sphere Weight, lbs [N] 2.000 [8.8]
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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