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Threaded & Socket Welded Steel Fittings - Pressure Classes vs. Schedules

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

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

Schedule - numbers assigned to different wall thickness of pipe (i.e. schedule 80)

Threaded fittings are available in pressure classes 2000, 3000 and 6000.

Socket-welded fittings are available in pressure classes 3000, 6000 and 9000.

ANSI Steel Pipe Schedule 40 Chart: Dimensions, Weights & Specifications
Internal and external diameters, areas, weights, volumes and number of threads for ANSI schedule 40 steel pipes.
ANSI Steel Pipes Schedule 80: Dimensions, Sizes, and Specifications
Internal and external diameters, areas, weights, volumes and number of threads for schedule 80 steel pipes.
ASTM D1785 and ASTM F441 - PVC and CPVC Pipes Schedule 40 & 80
Standard dimensions and weight of PVC - Polyvinyl Chloride - and CPVC - Chlorinated Polyvinyl Chloride.
ASTM International - Standards for Steel Pipes, Tubes and Fittings
The ASTM standards covers various types of steel pipes, tubes and fittings for high-temperature services, ordinary use and special applications such as fire protection use
ISO - Pipe, Tube and Fittings Standards and Specifications
International Organization for Standardization - ISO - pipe, tube and fittings standards and specifications.
JIS - Pipe, Tube and Fittings Standards
Japanese industrial pipe, tube and fittings standards and specifications from the Japanese Standards Association - JAS.
Pipes - Nominal Wall Thickness
Nominal wall thickness of seamless and welded carbon and alloy steel pipes
Schedule - Terminology
Introduction to the schedule terminology of pipes.