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welcome to this Swagelok how-to video in this segment we will look at identifying thread pitch and size thread pitch concerns are very important to anyone who uses fittings or any threaded components heres what youll need to perform the procedure shown in this brief video a caliper a pitch gauge and a thread pitch identification guide lets take a look threads have peaks and valleys referred to as crest and roots the surface between the crest and the root is called a flank tapered threads which may also be referred to as dynamic threads are designed to seal as the flanks of the mating threads are drawn together thread sealant is required to fill in the gaps between the crest and the roots to prevent system fluids from penetrating the connection straight threads which may also be referred to as parallel threads are not designed to seal they must rely on other factors such as a gasket o-ring or some kind of metal to metal contact to create a leak tight seal the first step to