Threaded & Socket Welded Steel Fittings - Pressure Classes vs. Schedules
Pressure classes, schedules and weights of pipes for threaded & socket welded fittings. Provides reference data for standard (STD), extra strong (XS), and double extra strong (XXS) schedules across different pressure classes.
Pipe Schedule and Designation
Threaded fittings are available in pressure classes 2000, 3000 and 6000.
Socket-welded fittings are available in pressure classes 3000, 6000 and 9000.
Legend
- Standard (STD) - Standard wall thickness
- Extra Strong (XS) - Extra strong wall thickness
- Double Extra Strong (XXS) - Double extra strong wall thickness
- Schedule - Numbers assigned to different wall thickness of pipe (i.e. schedule 80)