When placed side by side, the difference between the two connection types is clear. The NPT thread is slightly tapered, while the G connection is straight. Another obvious visual: The G connector ends with a small protrusion (nipple), used to center the gasket. If calipers are handy, a third method is to measure the angle between threads: NPT threads are 60°, while BSP threads are 55°.

You can also get adapters to take copper tubing or PEX to a male G fitting by compression. The G3/4 size is common to almost all flat panel radiators. The beauty of those is one can remove them and re-use. Example: Simplex F11173 & it's siblings. I've seen those at a 6 degree angle & still not leak.A common variation of this Process Connections is the M/F-250, or the autoclave fitting. This fitting has a cone at the end of it for pressure ranges above 10,000 psi. It is also commonly referred to as a Sno Trik® fitting as well – though that is a brand name. Most of the time, the answer depends on geography. In the U.S. or Canada, the pressure gauge will most likely come with an NPT (National Pipe Tapered) connection. This thread type, standardized by ANSI (American National Standards Institute) and ASME (American Society of Mechanical Engineers), is typical among North American measuring instruments, found in piping systems, pumps, compressors, plumbing systems, mobile working machines, and many more applications. In the USA, NPT (National Pipe Tapered) is the most popular process connection, especially in businesses of oil and petroleum. Compared with BSP, NPT is easier to cut and user-friendly, and is considered a booster to American Industrial Revolution. Being a kind of screw thread system, NPT is tapered thread with the pressure tight seal being made on the thread itself. The most common sizes are 1/4, or 1/2 inch NPT. 1/2"NPT MALE The most common G 1/4″ threads at WIKA are surely the G 1/4 in accordance with EN 837 or DIN 3852-E. But in addition there are many other pressure connections which are all specified as G 1/4″. For example G 1/4 Ermeto and G 1/4 DIN 3852-A, just to name two. Although, as indicated in the designation, all pressure connections have a thread with the nominal diameter G 1/4″, the types of sealing discern so greatly that in some cases a compatibility is not possible. external) & 3B (internal): for applications where closeness of fit and/or accuracy of thread elements are important.

The threaded part(s) of plumbing fittings are usually made to a British Standard Pipe Thread size (BSP). BSP, British Standard Pipe, was created by Joseph Whitworth in the middle of 19 th century and is now widely accepted from Europe to Asia, in particular in the UK. BSP is a type of parallel thread and the pressure tight seal is enabled with a sealing washer, which is made of different materials depending on the pressure and the medium being used. The most common sizes are ¼ or ½ inch BSP. 1/2"BSP MALE The “M” designation for metric screws indicates the nominal outer diameter of the screw, in millimeters (e.g., an M6 screw has a nominal outer diameter of 6 millimeters). (Source from Wikipedia) ISO 262 selected sizes for screws, bolts and nutsThe adapter has a built-in O ring seal which acts the same as bonded or dowty seal for sealing the 1/4 BSP (G1/4) thread end. There are subtle variations in DIN3852 pressure fittings available, but the following are the most common examples: There are mainly two ways of identifying a british standard pipe parallel (BSP-P) thread, either with the thread size suffixed by “BSP-P” or prefixed with “G”. Often the 2nd P is left off because BSPT tapered threads are less common and BSP is assumed to be parallel unless otherwise specified.

I would like to know if a 1/2 inch NPT instrument connection would fit into a 1/2 inch BSP sample port or could we use a G 1/2 B connection instead? BSPP is the standard for hydronic radiators in the UK, Europe & Asia. Most of the flat panel ones & towel warmers sold in Taper threads, British Standard Pipe Taper thread ( BSPT), whose diameter increases or decreases along the length of the thread; denoted by the letter R. British Standard Pipe ( BSP) is a set of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external ( male) thread with an internal (female) thread. It has been adopted as standard in plumbing and pipe fitting, except in North America, where NPT and related threads are used.

You can only compare up to four products at a time.

Neither will work, BSP or G parallel threads are not compatible with NPT tapered threads, ideally you should use an adapter between the two threads to be sure of a reliable seal between the two different types of thread. Flush diaphragm seals fitted to DP Transmitters The sealing technique for both types is fundamentally different, NPT relies on the gradual compression of the flanks of the internal and external thread to directly form a seal on the thread, whereas a G1/4 provides the mechanism for compressing a seal typically between two flat surfaces at one end of the male thread. Adapt G1/4 (1/4BSP) female to accept 6mm OD tubing Parallel (straight) threads, British Standard Pipe Parallel thread (BSPP). These are sometimes denoted by the letter G, for example G 1/2" means a parallel 1/2 inch BSP thread. The specified values for the maximum pressure are rounded values and are assigned to the nearest standard scale range.

A 1/4 BSP (G1/4) thread has a 13.157mm outside diameter and a 1/2 BSP (G1/2) thread has a 20.955mm outside diameter. 0.25-18 NPT thread explanation The terminology for the use of G and R originated from Germany ( G for gas, as it was originally designed for use on gas pipes; R for rohr, meaning pipe.) Inch BSP - Outlet thread on 3/4 inch outside tap (we have a 7/8 inch BSP brass garden hose connector).Pressure connections which include the suffix EN 837 or DIN 16288 are sealed on the end of the thread with a small diameter O ring which is placed around the post protruding from the end of the thread. In the female mating part of the pressure connection there is a hole with sufficient diameter to locate the male end post without pinching the O ring. I know this thread is very old, but I'm adding just in case someone stumbles upon it looking for information. Hopefully it will clear up a little confusion & helps someone someday: The standard ISO 7 - Pipe threads where pressure-tight joints are made on the threads consists of the following parts: