Malleable iron screwed fittings are highly durable, robust components widely used in plumbing, heating, and industrial systems for joining pipes without welding. They are standardized by EN 10242 and ISO 49 and are prized for their resistance to vibration, thermal expansion, and mechanical stress.
Key Characteristics
Malleable iron is a treated iron-carbon alloy that possesses both high strength and a good level of ductility, allowing it to flex under impact without breaking, unlike traditional grey cast iron.
- Material: Made from high-graded whiteheart or blackheart malleable cast iron (e.g., grade EN-GJMB-350-10).
- Standards: Primarily conform to the European standard BS EN 10242 and international standard ISO 49.
- Threading: Feature precisely machined threads, typically British Standard Pipe (BSP), with male taper (R) and female parallel (Rp) threads to ensure a pressure-tight seal when used with a sealant.
- Pressure & Temperature: Suitable for operating pressures up to 25 bar (PN25) and temperatures up to around 230°C.
- Finishes: Available in a "self-colour" (black, lightly oiled) finish or a hot-dip galvanized finish for enhanced corrosion resistance.
Typical Applications
Malleable iron fittings are versatile and suitable for many non-aggressive media applications.
- Domestic and commercial water and heating systems (hot and cold water).
- Natural gas and LPG lines.
- Compressed air systems and pneumatic applications.
- Oil and fuel lines.
- Fire suppression and sprinkler systems.
