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How to measure threads |
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Compare these three measurements to the tables below to find the closest match. |
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BSP - British Standard Pipe (BSPP Parallel & BSPT Taper) |
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The British BSP connections include two types of thread, BSPP which are straight (or parallel) and BSPT which are tapered. The BSPT tapered male will mate with a BSPT tapered female (usually a port) and seals on the thread. The BSPP parallel male has a 30° chamfered seat which seals with a BSPP female on its 30° cone seat. |
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JIC - SAE J514 37° Flare |
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Commonly referred to as 37° JIC, this connection is widely used in hydraulic systems. When the straight threads are engaged, the 377° male seat seals on the 377° female flare seat. |
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ORFS - SAE J1453 O-Ring Face Seal |
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This connection is designed for leak-free use to 6000 PSI. The o-ring in the face of the straight thread male end seals against the flat face female seat and is mechanically held in place by a swivel nut. |
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Metric DIN 3902 |
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This connection style consists of a common male and three different female halves. The male has a straight metric thread, a 24° included angle and a recessed couterbore that matches the tube O.D. used with it. The female may be a tube, nut and olive, a tapered nose /Globeseal flareless swivel or a tapered nose/Globeseal flareless swivel with an O-Ring in the nose. |
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NPTF - National Pipe Tapered Fuel |
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This connection is used in America and may be found on machines/equipment from that country. The thread is tapered and the seal takes place by deformation of the threads. It is also sometimes known as A.P.I. |
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