NPT - National Pipe Thread - is the US standard. Most of the rest of the world uses BSP - British Standard Pipe. 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”. The standard ISO 228 - Pipe threads where pressure-tight joints are not made on the threads consists of the following parts: The standard ISO 7 - Pipe threads where pressure-tight joints are made on the threads consists of the following parts:

Malleable iron fittings are perfect for a wide variety of uses. They are highly durable and very popular in the plumbing industry as they can be used in commercial and residential applications. RS have a great range of pipe fittings which are easy to use and can change the direction of the water flow. Pipe fittings offer watertight seals making them essential for plumbing and pipeline applications. What are threaded pipe 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. 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. One of the most commonly used pipe fittings, stainless steel tees are used to adjust the flow rate and change direction. Our steel tees come in sizes ranging from 1/8” to 4”. The right steel fittings for your needs

PIPE, FITTINGS & VALVES

At certain sizes, NPT and BSP share the same number of threads per inch - at ½" and ¾" - but at all other sizes the two are quite different. The table below lists the TPI for both NPT and BSP at sizes commonly used with domestic radiators. Nominal Taper threads, British Standard Pipe Taper thread ( BSPT), whose diameter increases or decreases along the length of the thread; denoted by the letter R. We are often asked why malleable iron fittings are so popular. Malleable iron fittings are heavier than standard pipe fittings; they have good thermal expansion and vibration damping properties and do not break during assembly. Malleable iron fittings at your door in no time At least 41 thread sizes have been defined, ranging from 1⁄ 16 to 18, although of these only 15 are included in ISO 7 and 24 in ISO 228. [3] [4] [5] [6] The size number was originally based on the inner diameter (measured in inches) of a steel tube for which the thread was intended, but contemporary pipes tend to use thinner walls to save material, and thus have an inner diameter larger than this nominal size. In the modern standard metric version, it is simply a size number, where listed diameter size is the major outer diameter of the external thread. For a taper thread, it is the diameter at the "gauge length" (plus/minus one thread pitch) from the small end of the thread. The taper is 1:16, meaning that for each 16 units of measurement increase in the distance from the end, the diameter increases by 1 unit of measurement.

Please use a suitable tool to fasten and remove the fittings through the outer hexagon or inner hexagon of the fitting body. When tightening the fittings threads, please refer to the recommended torque amount listed in the recommended torque values information above. If the torque amount exceeds the recommended value, it can cause stress to the threads and may cause the fitting to break, or the gasket to deform and cause the fitting to leak. The nominal size refers not to the outside of the pipe, nor even to the outside of the thread, but to its internal bore - the inside of the tube where the fluid flows. It makes sense when sizing pipes for flow rate but it makes things confusing when measuring for replacement parts. The threads are rounded equally at crests and roots by circular arcs ending tangentially with the flanks where r ≈ 0.1373 P In Japan JIS tapered and parallel threads are common and are interchangable with the respective BSPT and BSPP threads,

The threaded part(s) of plumbing fittings are usually made to a British Standard Pipe Thread size (BSP).

The hexagon bush collection includes stainless steel reducing bush suitable for various applications. Sizes range from 1/4” to 4”. 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? this can vary. Smaller sizes can be 1.0mm thread pitch, and larger sizes can be 2.0mm thread pitch. Other variations 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.)Brass pipe fittings are suitable for connecting copper tubes, stainless steel tubes and plastic pipes that have compatible outside diameters. Pipe fittings have various connection types including compression, push fit, threaded and solder and are ideal for all plumbing work. BES has all the steel fittings you need, from screwed stainless steel elbows to hose tail adaptors. Some of the most popular product types within this range would include: British Standard Pipe is the standard thread used on plumbing fittings across most of the world (but not in North America). Below, you'll find tables showing BSP sizes in mm; tables detailing the difference between BSP and the American standard NPT; an explanation of straight and tapered thread types; and a handy thread size ruler and template to print out and use at home. 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”. Taper threads, British Standard Pipe Taper thread (BSPT). These are sometimes denoted by the letter R, for example R 1/2" means a taper 1/2 inch BSP thread.

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.

Below is a summary of the common BSP thread sizes in used with cast iron radiators and their corresponding actual outside diameters in millimetres. The actual outside diameter is what you can measure when looking at a valve tail, a threaded nipple, reducing bush or an opening in the radiator. BSP Sizes In Millimetres Nominal