codes & standards

Threaded & Socket Welded Fittings - Pressure Classes and Schedules

Pressure classes, schedules and weights of pipes for threaded & socket welded fittings

Pipe Designation Schedule/MFR
Pressure Class	2000	3000	6000	9000
Threaded Fittings	80/XS	160	XXS
Socket Fittings		80/XS	160	XXS

Standard (STD), Extra Strong (XS) and Double Extra Strong (XXS)

Schedule - Numbers assigned to different wall thicknesses of pipe (i.e. schedule 80)