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 SEAL INSTALLATION BULLETS
Sharp edges or corners on splines, keyways, snap-ring grooves, cross-holes or
stepped diameters can easily cut or invert a seal lip and dislodge the spring.
Thus, when installing a seal over a shaft with irregularities such as these, you should
use a tapered assembly bullet.
The tapered assembly bullet should be designed to guide the seal lip past the area
of possible damage. For sufficient installation clearance, the outside diameter of the
bullet must be smaller than the heel diameter of the seal. A maximum taper of 20
degrees with a generous radius transitioning to the outside diameter will ensure
correct assembly. The figure below is an example of an assembly bullet.
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