Seal
screws are unique in their head configuration.
As you can see from the illustration, a recess
groove is machined or cold-headed to form a cavity
shape into which the "O"-ring is fitted. The
groove volume is calculated based on the "O"-ring
cross section, the "O"-ring inside diameter and the
compression of the cavity walls, i.e., the groove
into which the "O"-ring is fitted. The
combination of the cavity (groove) and the "O"-ring
provides a tight seal by squeezing the "O"-ring.
In the illustration you can clearly see that with
the "O"-ring compressed, a zero clearance is created
within the cavity itself, blocking the
internal/external flow of liquids or gases.
At Zago,
each feature of each screw is tested to eliminate
any and all sources of seal screw failure.
