The size was originally based on the inside diameter, measured in inches, of a steel pipe for which the thread was intended. This is the source of the confusion, as people incorrectly think the size refers to the outside diameter of the male thread. G is the international standard shorthand for BSPP - BSP Parallel threads. R is the standard for BSPT - BSP Tapered. Parallel (G) threads are used where the seal is made on a mating face, like inside a cast iron radiator with the aid of a gasket. Tapered fittings achieve a tight thread-to-thread seal with the help of a little sealant such as PTFE tape or hemp and Boss White. Right first time All Metric fittings are not supplied with any sealing equipment and require the use of PTFE/Teflon tape when being installed. 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. Inch BSP - Bathroom basin taps and kitchen sink taps, radiator connections, shower hoses, old outside tap outlets, toilet cistern fill / float valves.

NPT - National Pipe Thread - is the US standard. Most of the rest of the world uses BSP - British Standard Pipe. Parallel (straight) threads, British Standard Pipe Parallel thread ( BSPP; originally also known as [1] British Standard Pipe Fitting thread/ BSPF and British Standard Pipe Mechanical thread/ BSPM), which have a constant diameter; denoted by the letter G. Please note that it is only recommended to use these products with air or pure water (pure water must not exceed 60°C). In pure water applications, if the temperature of the fluid exceeds 60°C, the heat and moisture can cause damage to the fitting's body and gasket.They have been designed to join piping systems by coupling thread ended pipes and accessories available as male thread and female thread connector types and a selection of thread standards to choose from e.g.: BSP, NPT or G. Threaded joints are mainly used on smaller diameters pipes in non-critical applications such as domestic oil, gas, air conditioning, heating ventilation installations but can also be seen in pneumatic, automotive applications. Common types of threaded fittings are 90° elbows, 45° elbows, tees, straight fittings, square head plugs, hex head plugs, reducers, adaptors, flanges, caps, bushings. Threaded fittings systems ensure leak-tight connections in all low-pressure, low-temperature installations where vibration is not encountered. What does DZ on brass fittings mean?

Suitable for natural gas, LPG, hot and cold water and other applications, we have every stainless steel elbow you might need. Our elbow sizes range varies from 1/8” to 4”. Making BES your one-stop shop for all your steel pipe fittings needs is a no brainer. Our range includes all the essentials possibly needed as well as specialised fittings.BSP sizes don't match up with what you measure on the scale of a ruler, which can obviously cause some confusion. For example a 1/2 inch BSP thread (see above) actually measures more like 3/4 inch with a ruler. Our stainless steel hose tail adaptors can be used to connect a hose to a threaded pipe, providing a high-quality, reliable join. Sizes range from 1/4” to 4”.