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Fred A. Lennon and Cullen B. Crawford founded Crawford Fitting Company in Cleveland, Ohio, in July 1947 to manufacture the Swagelok tube fitting, which used a two-ferrule design to “swage” or form the tube and lock it into place. One year later, Lennon bought out Crawford and continued to grow the business.
European convention uses DN (nominal diameter) to denote a nominal size of each fitting. Various manufacturers specify series or styles for each profile. Fittings are commonly referred to by their manufacturer name/series, i.e., "Rectus 25" for the common European standard.
Lokring designs patented, [4] weld equivalent pipe and tube fittings such as couplings, flanges, elbows, adapters, and more. The unique technology of the patented [ 4 ] Lokring fittings utilize "Elastic Strain Preload" [ 5 ] (ESP), and possesses a metal to metal leak-free seal that compresses or swages the pipe/tube wall.
Engineering fits are generally used as part of geometric dimensioning and tolerancing when a part or assembly is designed. In engineering terms, the "fit" is the clearance between two mating parts, and the size of this clearance determines whether the parts can, at one end of the spectrum, move or rotate independently from each other or, at the other end, are temporarily or permanently joined.
Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...
A 37° flare type end fitting for flexible hose The AN thread (also A-N ) is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid. It is a US military-derived specification that dates back to World War II and stems from a joint standard agreed upon by the Army Air Corps and Navy, hence AN.