This part of ISO 10424 specifies requirements on rotary shouldered connections for use in petroleum and natural gas industries@ including dimensional requirements on threads and thread gauges@ stipulations on gauging practice@ gauge specifications@ as well as instruments and methods for inspection of thread connections. These connections are intended primarily for use in drill-string components. Other supplementary specifications can be agreed between interested parties for special tolerance requirements@ qualification@ testing@ inspection and finishing. This part of ISO 10424 is applicable to the following preferred rotary shouldered connection designs: number (NC) style; regular (REG) style; full hole (FH) style. These are traceable to an internationally supported system of gauges and calibration