They join compatible threaded steel pipe in services specified for this material. The fitting class, thread, fluid, pressure and temperature must match the design.
Steel Pipe Joints for Heating and Service Installations
Black iron fittings form threaded connections in compatible steel pipework. MacBlair stocks components for changes of direction, branches, reductions and terminations within the broader pipe and fittings range.
Nominal bore and thread form must match throughout the installation. A fitting that starts on the thread but tightens incorrectly may be the wrong standard. Count the required elbows, tees, sockets and reducing pieces from a measured drawing rather than assembling the route by trial.
Prepare male threads cleanly and use a jointing product approved for the fluid, pressure and temperature. Tighten with tools positioned so torque is not transferred into valves, appliances or concealed joints. Support the pipe independently.
Black iron can require corrosion protection where exposed to damp conditions. Gas and fuel work must be specified and completed by a correctly qualified professional. For water services using other materials, compare copper pipework or plastic plumbing systems.
Black Iron Fittings FAQ's
They are generally sold by nominal bore and thread size, not by a simple outside-diameter measurement. Check the pipe markings and thread standard.
Threaded joints need a sealing product approved for the service. The correct choice differs for water, gas, oil and temperature conditions.
Only with corrosion protection and a specification that permits the exposure. Threads and damaged coatings are particularly vulnerable to moisture.
No. Gas pipework must be installed and tested by a Gas Safe registered engineer qualified for the gas type and work involved.