Thread form tap12/8/2023 ![]() ![]() Just to confuse things, often the T in BSPT refers to Thread and doesn't indicate either Taper or Parallel.ġ/4 Inch BSP - Compressed air connectors.ģ/8 Inch BSP - Central heating oil line connectors, some European toilet cistern fill valves (not common in UK).ġ/2 Inch BSP - Bathroom basin taps and kitchen sink taps, radiator connections, shower hoses, old outside tap outlets, toilet cistern fill / float valves.ĥ/8 Inch BSP - Old outside tap outlets (we have an adaptor for this size).ģ/4 Inch BSP - Bath taps, washing machine inlet hose connections, modern outside tap outlets.ħ/8 Inch BSP - Outlet thread on 3/4 inch outside tap (we have a 7/8 inch BSP brass garden hose connector).ġ Inch BSP - Domestic heating boilers and hot water cylinders, urinal flush valves.ġ-1/4 Inch BSP - Wash hand basin (bathroom sink) wastes.ġ-1/2 Inch BSP - Kitchen sink wastes, bath wastes, toilet syphon outlets, central heating pumps.Ģ-1/4 Inch BSP - Immersion water heater elements. For technical drawings and 3-D models, click on a part number. This short chamfer lets them thread holes closer to the bottom than other taps, but they require more torque to start threads. These are sometimes denoted by the letter R, for example R 1/2" means a taper 1/2 inch BSP thread. Bottoming-chamfer taps form threads in the workpiece with just 1-2 chamfered threads. Lube Grooves for lubrication and venting in blind holes. Taper threads, British Standard Pipe Taper thread (BSPT). Below are 8 unique facts of Thread Forming Taps (and some may surprise you). Thread forming taps have no flutes or cutting edges and provide chipless tapping. These are sometimes denoted by the letter G, for example G 1/2" means a parallel 1/2 inch BSP thread. Parallel (straight) threads, British Standard Pipe Parallel thread (BSPP). This is the source of the confusion, as people incorrectly think the size refers to the outside diameter of the male thread. When cutting this thread the recommended tap H limit value is H-5 but when roll forming the same thread the recommended value is H-7. The size was originally based on the inside diameter, measured in inches, of a steel pipe for which the thread was intended. For example a 1/2 inch BSP thread (see above) actually measures more like 3/4 inch with a ruler. ![]() With the roll taps of our DURAMAX-family, we offer you a. The threaded part(s) of plumbing fittings are usually made to a British Standard Pipe Thread size (BSP).īSP sizes don't match up with what you measure on the scale of a ruler, which can obviously cause some confusion. As forming tools, they use the processed materials flowing properties to form the internal thread. ![]()
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