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(1) a joint force of the force as much as possible by NSK Bearings axis, which requires force point symmetrical steady force by spherical or parallel to the axis.
(2) force the size should be smooth and uniform, should not be a shock, which require the use of hydraulic or tools can exert the smooth tension or pressure, really have to use the hammer, but also by copper sleeve, softer buffer of scrap metal to be, the percussion force as much as possible playful. Best use of brass or copper hammer hammering.
(3) avoid force through the rolling element, which requires the a detachable inner ring (shaft washer) force through the inner ring, when dismantle outer ring) through the outer ring force.
(4) drag force to continue to an appropriate degree, such as NSK Bearings fits perfectly into the correct position to stop installing the bearing force, to ensure that the end face of the ferrule (washers) abuts the housing bore or shaft shoulder block face neither packed too tight, they can not be installed in place.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7904A5TYNSULP4 NSK | 20 | 37 | 9 |
| 7903A5TYNSULP4 NSK | 17 | 30 | 7 |