Threaded Tube Fittings

Match the fitting material, thread type, size, and pressure rating to your tubing and system; common materials are brass, stainless steel, and carbon steel, and common thread standards include NPT, BSPT, and metric threads—verify compatibility with fluid type, temperature, and required corrosion resistance

Identify whether your system uses tapered (e.g., NPT/BSPT) or parallel/metric threads and measure nominal thread size and pitch; verify male/female orientation and check manufacturer specs or use a thread gauge to avoid mismatches

Choose fittings with pressure and temperature ratings that exceed your system’s maximum operating conditions; ratings depend on material, wall thickness, and seal type, and using the correct rating prevents leaks and premature failure

Common sealing methods include PTFE tape, pipe dope (sealant), and integrated elastomeric seals; select a method compatible with fluid chemistry, temperature, and the thread type to ensure a reliable seal

Periodically inspect for corrosion, thread wear, and leaks, retighten to specified torque if needed, replace damaged fittings or seals, and follow a maintenance schedule based on operating conditions to maintain safety and performance

Stainless steel offers higher corrosion resistance and longevity in harsh or sanitary environments but is typically more expensive, while brass is corrosion-resistant and cost-effective for many fluids; choose material based on chemical compatibility and budget

Look for fittings that conform to recognized standards (ISO, ASME, DIN) and confirm thread and dimensional compatibility; even same-named thread standards may vary, so cross-reference dimensions before substituting parts