Bearing spinout and what to do about it


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Regardless whether the bearing has been pressed, shrink or slip fitted into place, a certain micro clearance remains between it and the housing / shaft it has been mounted into / onto. This can cause them to spinout within the housing or off the shaft, under the impact of forces they are subjected to in their normal working life. Apart from the spinout risk, the air between the surfaces of the bearing and housing or shaft can allow for the forming of the rust which can cause damage to the parts and cause you many headaches during disassembly for maintenance.

Using Loctite 641 retaining compound, both spinout and corrosion induced damage can easily be avoided. This product seals the space between the bearing surface and the housing or shaft, fixing it in place and preventing spinout. Having sealed out the clearance, it also eliminates the usual place where rust would form.

The use of the product is very simple. You need to clean the joining surfaces with Loctite 7063. In case your bearing is inboard, you’ll apply the bead of Loctite 641 to the circumference of the shaft at the leading area of engagement. In case you’re dealing with an outboard bearing, you’ll apply the product to the outside diameter of the bearing. And you’ll assemble your parts as you normally would. Any access adhesive can be wiped off with a cloth.

Loctite 641 is a medium strength retainer. That means that, although it will keep your bearings safely in place in between two maintenance activities, you’ll dismantle it easily with standard tools whenever you need to.

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