A threaded flange connects directly to a pipe via internal threads (instead of welding). The flange bore is machined with standard taper pipe threads (e.g., NPT, BSPT) or parallel pipe threads (BSPP). During installation, a gasket is placed between the flange faces, then the threaded flange is screwed onto the pipe; the threads provide self‑locking and the necessary compression force for sealing. Threaded flanges are typically used for nominal sizes ≤ DN50 (NPS 2″), because larger diameters make thread machining difficult and require excessive installation torque.
Compared to welded flanges, the biggest advantage of threaded flanges is no hot work. This makes them ideal for flammable / explosive environments such as natural gas, gasoline, chemical solvents, and retrofit projects where welding is not allowed on site. In addition, threaded connections allow repeated disassembly, suitable for pipe sections requiring regular inspection or cleaning. However, threaded flanges demand high precision on the mating pipe threads. We can match threads per customer’s specifications or sample. Facing types include Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), etc., which together with the proper gasket provide reliable sealing.
Why Choose Us / Advantage
Warranty – EN 10204 3.1 material certificate and 12‑month warranty; 100% thread inspection with gauges on each flange.
Customization – Any thread standard available (NPT, BSPT, BSPP, metric); special materials (duplex, Monel) and non‑standard pressure ratings per drawing.
Fast delivery – Semi‑finished blanks for common carbon/stainless threaded flanges in stock; final machining 7‑10 days; bulk orders 20 days.
Rigorous testing – MT or PT inspection on threaded areas to avoid cracks; batch PMI analysis to verify material correctness.
Rust prevention & protection – Threads coated with anti‑rust oil and fitted with plastic protectors; export plywood case packaging.
Technical Data
★ Standard: ANSI/ASME B16.5, GB/T 9119, DIN 2573
★ Body Material: Carbon Steel (A105, Q235, 20#); Stainless Steel (304, 316, 304L, 316L)
★ Pressure Class: Class 150, 300 (PN10~PN40)
★ Size Range: DN15 ~ DN100 (1/2" ~ 4")
★ Thread Type: NPT, BSP, BSPT (customizable)
★ Face Type: Raised Face (RF)
★ Surface Treatment: Anti-rust oil (carbon steel) / Pickling & passivation (stainless steel)
Applications
● Oil & gas fields – Wellhead Christmas trees and flow lines, avoiding welding sparks in hazardous areas
● Chemical & refinery plants – Small‑bore solvent, acid/alkali lines in no‑hot‑work zones
● Gas regulator stations & distribution networks – Flange connections in indoor or explosion‑proof areas
● Fire protection systems – Small‑bore sprinkler branch lines for easy installation and retrofit
● Compressed air & hydraulic systems – Pipe sections requiring easy disassembly for maintenance in workshops
● Ships & offshore platforms – Piping parts needing quick replacement
