90° Stainless Steel Threaded Elbow Pipe Fitting — BSP, NPT & Metric

Match the thread size to your existing pipe or port. BSP (G) and NPT sizes are expressed as nominal pipe sizes — for example, G1/4" (≈13mm bore) or NPT 1/2" (≈21mm bore). Metric sizes like M14×1.5mm refer to the outer thread diameter and pitch. When in doubt, measure the outer diameter of the male thread or the inner diameter of the female port and compare to a thread chart. In inch terms: G1/8" ≈ 0.125", G1/4" ≈ 0.25", G1/2" ≈ 0.5", G1" ≈ 1.0".

304 stainless steel is suitable for most indoor plumbing, compressed air, and general fluid systems. 316 stainless steel contains added molybdenum, which generally provides better resistance to chlorides and salt — making it a common choice for marine, coastal, or chemical-exposure environments. If your application involves saltwater, pool chemicals, or aggressive cleaning agents, 316 SS is typically the more appropriate choice.

316 SS variants are generally suitable for outdoor and marine-adjacent applications due to their improved corrosion resistance. For direct saltwater immersion or highly aggressive chemical environments, consult your system specifications before selecting a grade. 304 SS is typically adequate for sheltered outdoor use where direct salt spray is not a factor.

No. BSP (G) and NPT threads have different thread angles and pitches and are not directly interchangeable. BSP uses a 55° thread angle while NPT uses 60°. Even when nominal sizes appear similar (e.g., G1/4" and NPT 1/4"), the threads will not seal correctly if mixed. Always match the thread standard of your existing fittings or equipment.

Pressure ratings vary by size, thread type, and the fluid being carried. Stainless steel threaded fittings of this type are generally rated for use in low-to-medium pressure systems. Contact us to confirm suitability for your specific pressure and fluid requirements before installation in high-pressure lines.

For tapered threads (NPT), PTFE tape or thread sealant compound is typically recommended to achieve a leak-free seal. For parallel threads (BSP/G), a bonded seal washer or O-ring face seal is generally used instead of tape. Always follow the sealing method appropriate for your thread type and the fluid or gas being carried.

Choose based on the terminations of the pipes or components you are connecting. Female-Female connects two male-threaded pipes or nipples. Male-Male connects two female-threaded ports or couplings. Female-Male (street elbow) has a female thread on one end and a male thread on the other — useful for routing directly out of a female port without a separate nipple, saving space in tight installations.