This connection is commonly
used in fluid power systems.
There are two pressure ratings.
Type I (Code 61) is
referred to as the “standard”
series and Type II (Code 62)
is the “6000 psi” series. The
design concept for both series
is the same, but the bolt hole
spacing and flanged head
diameters are larger for the
higher pressure, Type II connection.
Both metric and inch
bolts are used.