Boss caps are cup-shaped rings stamped from metal sheet which are pressed onto
the top of hollow plastic bosses by hand, with a
pneumatic device, or with a light press. The caps reduce the tendency of the
bosses to crack by reinforcing the boss against the expansion force exerted by
screws. The caps are used with
thread-forming screws and include a single thread for additional strength.
Sheet metal boss cap pressed onto the top of the boss to reinforce the boss and provide additional assembled strength
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