API Spec 7-2

Specification for API Spec 7-2 Threading and Gauging of Rotary Shouldered
Thread Connections. 
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, and instruments and methods for inspection of thread connections.

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XPL Series

Series XPL from thread sizes for Watchmakers until large size diameters 400, 500 or 600 mm

XPL-C Series

Series XPL-C for thread sizes 1.0 mm to  large size diameters 200 or 300 mm.