HGW Blog

JIC is a widely used industrial hydraulic connection built around a 37-degree metal flare. A straight-thread nut pulls matching male and female seats together; fluid containment occurs at that conical contact rather than in the threads. This separation makes the joint inspectable and serviceable, but it does not make every 37-degree-looking fitting interchangeable. Standard, size, surface conditio

JIC size cannot be confirmed from a single diameter. A correct identification links the 37-degree sealing seat, straight thread diameter, thread pitch, dash size, and mating component. Missing any one of those checks can turn an “almost fit” into a damaged flare or wrong order. Use clean samples and proper gauges. If the fitting came from a machine, document its location and the opposite end befor

A hydraulic adapter is the boundary between two connection systems. It may change thread family, nominal size, sealing method, direction, or branching. Choosing one by wrench size or port diameter ignores the two surfaces that must retain pressure. The practical selection method is to write a complete definition for end A and end B, then evaluate the body between them. This separates interface com

BSP identifies a British pipe-thread family. It does not identify pressure rating, fitting material, or one universal way to seal. Buyers need to separate the parallel and tapered forms, then document the face, washer, cone, O-ring, or thread interference that the specific component uses. That process matters in the United States because imported pumps, valves, cylinders, coolers, sensors, and att

BSPP and BSPT share the British pipe-thread family and a 55-degree Whitworth form, but they do not create a seal in the same way. BSPP has parallel threads and normally relies on a washer, O-ring, cone, or face. BSPT uses tapered engagement and the specified thread-sealing practice. That means an installer must identify more than nominal BSP size. The port shape and sealing component determine whe

Imported machinery often puts an unfamiliar pipe fitting beside parts stocked for U.S. equipment. NPT and British Standard Pipe connections may appear close, but their thread profiles and sealing arrangements were developed under different standards. A part that turns a few threads is not proof of compatibility. Replacement begins by splitting “BSP” into BSPP and BSPT. NPT is tapered. BSPT is also

NPT, BSPT, and BSPP pipe connections can look close enough for the wrong parts to begin engaging. They are not one interchangeable family. NPT uses an American 60-degree tapered thread. BSPT uses a British 55-degree tapered Whitworth form. BSPP uses a 55-degree parallel thread and depends on a separate sealing feature defined by the connection. The risk is greatest during replacement work, when a

NPSM and NPT can share nominal pipe sizes and thread pitch, yet they solve different connection problems. NPSM uses a straight thread in a mechanically seated arrangement, often a female hose swivel. NPT uses a tapered thread that wedges into a matching port and normally relies on approved sealant. The decisive question is not whether a nut begins to turn. It is where the finished joint is designe

National Pipe Taper remains common in U.S. fluid systems because a threaded fitting can connect directly to a compatible tapered port. Its apparent familiarity is also a source of errors: nominal size is mistaken for measured diameter, sealant is applied without contamination control, and tightening is used to compensate for damaged or mismatched threads. NPT performance comes from a complete join

NPT and NPTF fittings can have the same nominal size, pitch, taper, and 60-degree thread form. That physical similarity sometimes allows mixed parts to engage, but engagement alone does not establish a reliable or specification-compliant seal. The important difference is the way thread tolerances and crest-root contact are controlled. NPT normally uses a suitable thread sealant. NPTF is a Dryseal