Circular Flat Vacuum Preloaded Air Bearings LRAVP250 / 615-15219

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The model LRAVP250 air bearing has a 2.5 inch diameter and a 34 pound load capacity. A vacuum pocket located in the center of the bearing surface incorporates a secondary seal to allow for a nearly constant preload force of about 16 pounds. This helps achieve an air film stiffness of about 120,000 lbs/inch. The flat bearing surface carries loads without friction along guideways at a nominal air gap of 5 microns. Load may be imparted through a centrally located ball seat on the top surface of the air bearing.

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User Instructions
Comparison Table
Load Capacity, lbs[N] 34 [150]
Stiffness, lbs/inch [N/µm] 120000 [21]
Vacuum Holding Force at Rated Vacuum, lbs[N] 16 [68]
Ball Seat Preload Force at Rated Vacuum, lbs[N] 8 [35]
Flow Rate, scfh [slpm] 2.6 [1.2]
Air gap, microinches [µm] 200 [5]
Natural Frequency*, Hz 186
Physical Properties:
Diameter, inches [mm] 2.5 [63.5]
Height, inches [mm] 0.7 [18.0]
Ball Seat Diameter, inches [mm] 0.394 [10.0]
Mating Ball Stem Model number R5M8
Air Bearing Surface Flatness, microinches [µm] 20 [0.5]
Air / Vacuum Supply fitting thread, imperial [metric] M5 [10-32]
Material Aluminum/porous carbon
Weight, lbs [N] 0.321 [1.4]
Installation Requirements:
Mating Surface Local Flatness, microinches [µm] 20 [0.5]
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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