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The H-SERIES SST is a proprietary pin connection that
provides increased durability and fatigue resistance compared
to a standard API connection.
The SST involves a modification to the pin thread only; the
mating box thread remains standard. Completely interchangeable with the standard
API connections, the SST requires no crossovers or special rig handling
procedures.
The SST pin incorporates two primary features. First, the
thread form has an enlarged root radius. Second, the pin thread body is machined
on a slightly flatter taper than that of the box, effectively behaving like a
variable pitch thread.
These SST features provide improved fatigue life.
The reduction in stress at the pin thread roots and in the load at the last
engaged thread enhance the performance of the connection.
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