Hex or round head bushing used to reduce the diameter in a threaded connection.
| Standard | ASME B16.11 |
|---|---|
| Size range | 1/4" – 4" |
| Type | Hex head, round head, flush bushing |
| Pressure class | Usable up to Class 600 (bushings and plugs carry no class marking) |
| End connection | NPT threaded |
| Material | ASTM A105, A182 F304/F316 |
Selection and ordering notes
Socket weld and threaded fittings are used on drains, vents, instrument and utility lines of 2" and below. The socket weld type allows higher pressure, while the threaded type is the answer where welding is not possible.
Threading reduces the section, so SCH 80 pipe is normally required. Classes are given as 3000#, 6000# and 9000#. RTJ faces are frequently specified from class 600 upwards, and gasket and stud selection must follow that form. See five rules for fitting a flange for the details.
Hex or round head bushing used to reduce the diameter in a threaded connection.
Dimensions and tolerances are given in the original drawing and table on the technical document tab. Material certificates (EN 10204 3.1 / 3.2) and inspection reports are supplied with the order file.
