SW Socket Weld Flanges
- Standards
- ASME B16.5, ANSI
- Size range
- NPS 1/2–4
- Pressure
- Class 150, Class 300, Class 600
- Materials
- ASTM A105, A182 F304/F316
THD
Threaded Flanges
Threaded flanges screw onto the pipe and avoid field welding. They are used on utility lines, galvanized systems, and maintenance jobs where hot work is restricted.
- Standards
- ASME B16.5, ANSI
- Size range
- NPS 1/2–4, larger on request
- Pressure class
- Class 150, Class 300
- Materials
- ASTM A105, A182 F304/F316
- Facing
- RF, FF
Specification summary
| Standards | ASME B16.5, ANSI |
|---|---|
| Size range | NPS 1/2–4, larger on request |
| Pressure class | Class 150, Class 300 |
| Materials | ASTM A105, A182 F304/F316 |
| Facing | RF, FF |
Typical applications
- Utility and galvanized lines
- Maintenance without hot work
- Selected industrial systems
Manufacturing
Threads are cut after facing. NPT is default; BSP and other thread forms follow the RFQ. Do not use threaded joints as a substitute for weld-neck service.
Inspection
Dimensional inspection, PMI, UT, MT, hardness testing, and material traceability.
Related flange types
SW 
SO Slip-On Flanges
- Standards
- ASME B16.5, ANSI, DIN
- Size range
- NPS 1/2–24; DN 15–600
- Pressure
- Class 150, Class 300, PN10
- Materials
- ASTM A105, A182 F304/F316
BL Blind Flanges
- Standards
- ASME B16.5, ASME B16.47, DIN
- Size range
- NPS 1/2–24 (B16.5); larger on request
- Pressure
- Class 150, Class 300, Class 600
- Materials
- ASTM A105, A350 LF2