This popular brand of backnuts are highly durable and have great temperature resistance and therefore can be used safely in a very broad field of applications.

intermediate pressure rating at temperature between 120°C and 300°C can be obtained by linear interpolation; hot dip galvanised fittings should not be used below -10°C.

Malleable Fittings – Plugs & Nuts

George Fischer malleable iron pipe fittings are to BS143/1256, ISO49 and threads (taper male and parallel female) are to BS21, ISO7/1. The fittings are available self-colour (black) or hot dip galvanised finish to BS729 for increased corrosion resistance. Pressure rating is 25 bar at service temperature -25°C to +120°C and 20 bar at 120°C to 300°C.,Crane Fluid Systems straight pipe fittings are available self-colour (black) or galvanised finish, with taper internal and external pipe threads to BS21 and ISO7 for pressure-tight joints. They can be used with BS1387 steel tube for air, gas, steam and water services. Pressure rating is 25 bar at service temperature -20°C to +120°C and 20 bar at 120°C to 300°C.