![]() ![]() Thread count (also known as Threads Per Inch – TPI) and pitch are also important factors when identifying threads and are usually stated along with the thread size. ![]() Imperial thread sizes are expressed in inches and metric thread sizes in millimetres paired with “M” (e.g. The actual measurement is generally slightly lesser than the nominal thread size. Thread size is designated by the external major diameter of a thread that can easily be measured using a calliper. Soft seal connectors can be seen on the face of male fittings and adaptors (such as ORFS) which will establish a seal with a flat surface on a female fitting of the same size. This type of sealing method is common with adaptors intended for port use, where a soft seal on the base of the adaptor will seal with the flat surface of a port. Some connectors are designed to seal using elastomeric seals, natural or synthetic to prevent leakage. 30° cone seat ( BSPP, some Metric fittings).Connectors that have this sealing method will include a machined cone seat (convex or concave) that will seal with the corresponding male / female connector. Metal seal type was developed to maximise sealing of a connector under pressure. Tapered threads are designed to seal on the thread surface.Īlong with tapered threads, other sealing methods include: BSPP, UN are examples for parallel threads. Some threads have a tapered thread surface, such as BSPT, NPT (denoted by letter T) whereas others are parallel. To avoid damage to hydraulic systems, selecting the right type of thread is very important.Ĭommon variation in fitting designs are outlined below that is useful in thread identification. BSP (British Standard Pipe), NPT (National Pipe Tapered), UN (Unified Inch Screw Threads) and Metric to name some of the most common. There are many thread standards in the industry primarily based on the country / region of origin. Internal and external threaded connectors are also known as female and male, respectively. Hydraulic connectors can be grouped into three main types: As the name suggests, hydraulic connectors are used to connect hydraulic circuits by joining two different end terminations together and creating a flow passage to ensure fluid transfer. ![]()
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