The different sizes of Triclamp fittings are defined by two separate parameters, one is the sealing face flange diameter and the other is the diameter of pipe that the flange is intended to be used with: Tri-Clamp Size 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? The threads are rounded equally at crests and roots by circular arcs ending tangentially with the flanks where r ≈ 0.1373 P

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.What is the difference between the numerous G 1/4″ threads? And are they compatible among one another? One of my colleagues also often has troubles and gets confused because of all the various G 1/4″ threads which the market has to offer, or which are requested by the customer. It is a type of tapered thread process connection, normally written as 1/4inch – 18 NPT male, the 1/4 inch (0.25″) refers to the nominal NPT pipe size and the 18 refers to the number of threads per inch. 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.

Inch BSP - Outlet thread on 3/4 inch outside tap (we have a 7/8 inch BSP brass garden hose connector).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 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.