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Type WAU is a sprag type freewheel non bearing supported. Bearings are required to support axial and radial loads. Lubrication and sealing must also be provided by the installation. Nominal outside diameter is the same as a series 63 ball bearing.A typical arrangement is to install this type alongside a bearing within the same location tolerance as shown on the following page.The inner race is keyed to the shaft. The outer race has a positive n6 tolerance. to give a press fit in a H7 housing. Additional side notches in the outer race provide for positive torque transmission. If the housing is to K6 tolerance, use of the notches is not necessary, but the housing must be strong enough to not expand after assembly.The design can accept an axial misalignment of inner and outer race of ±S/2.

WAU8-12,WAU200 keyway to DIN6885.1,other size to DIN6885.3


2)Inner race overruns

3)Outer race overruns

Mounting Example


Standard installation of WAU is put the clutch with the bearing side by side,with same position,with the same tolerances.Use splined to couple the inner ring and shaft coupling. The outer sides of the end face of the key for securing the outer wall With the machine to transmit torque.

Using Notice

Use 2 # lithium grease 30% + Engine oil 70% , Stirring evenly. The grease required temperature range -40 ℃ ~+ 150 ℃. Plus grease once for every month.

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