• SST Low Stress Fatigue Resistant Thread Form


    • The Grant Prideco 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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