ASME B16.11 Forged fittings, Socket-Welding and Threaded
This Standard covers ratings, dimensions, tolerances, marking, and material requirements for forged fittings, both socket-welding and threaded. Types of fittings covered by this Standard are shown in table below, by class and size range.
Types of Fittings by Class Designation and NPS Size Range
| Description | Socket–Welding | Threaded | ||||
| CL3000 | CL6000 | CL9000 | CL2000 | CL3000 | CL6000 | |
| 45°, 90° Elbows | 1/8–4 | 1/8–2 | 1/2–2 | 1/8–4 | 1/8–4 | 1/8–4 |
| Tees, Crosses, Couplings | 1/8–4 | 1/8–2 | 1/2–2 | 1/8–4 | 1/8–4 | 1/8–4 |
| Half-Couplings | 1/8–4 | 1/8–2 | 1/2–2 | … | 1/8–4 | 1/8–4 |
| Cap | 1/8–4 | 1/8–2 | 1/2–2 | … | 1/8–4 | 1/8–4 |
| Square,Hex,Round Plug | … | … | … | 1/8–4 (Note) | ||
| Hex,and Flush Bushing | … | … | … | 1/8–4 (Note) | ||
Note: Plugs and bushings are not identified by class designation.They may be used for ratings up through Class 6000 designation.
Correlation of Fittings Class With Schedule Number or Wall Designation of Pipe for Calculation of Ratings
| Class of Fitting | Type of Fitting | Pipe used for rating Basis | |
| Schedule No. | Wall Designation | ||
| CL2000 | Threaded | 80 | XS |
| CL3000 | Threaded | 160 | … |
| CL6000 | Threaded | … | XXS |
| CL3000 | Socket-welding | 80 | XS |
| CL6000 | Socket-welding | 160 | … |
| CL9000 | Socket-welding | … | XXS |