Spherical Air Bearings SRA300-R45 / 620-39132

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The SRA300-R45 spherical air bearing will exhibit frictionless motion at zero speed and at any angle within the +/-45 degree travel range. With a vertical load capacity of over 400 pounds, this air bearing is well suited to support medium loads. A special anti-friction surface at the air film interface allows for occasional moving contact of the sphere without damage for all of the SRA series 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
Performance:
Load Capacity, lbs[N] 410 [1804]
Side Load Capacity, lbs[N] 131 [577]
Stiffness, lbs/inch [N/µm] 1653000 [286]
Flow Rate, scfh [slpm] 6.6 [3.1]
Air gap, microinches [µm] 200 [5]
Natural Frequency*, Hz 199
Drag Torque at 30 rpm, oz-in [N-m] 2.55E-03 [1.80E-05]
Physical Properties:
Base Diameter, inches [mm] 5.3 [134.6]
Bearing Height, inches [mm] 5.2 [130.8]
Pedestal Adapter Height, inches [mm] 1.0 [25.4]
Spherical Radius inches [mm] 76.2 [3.0]
Rotational Travel, deg 45
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] 14.000 [61.6]
Sphere Weight, lbs [N] 6.900 [30.4]
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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