The Comparison of Metric Thread Bite Type Tube Fitting and Flared Fitting

The metric thread bite type tube fitting is used in many fields, such like the petrochemical, oil & gas, water, hydraulic, high pressure systems, pneumatics, etc., in order to meet such huge market demand, a number of manufacturers of this product type around the world are emerging correspondingly.

Some major fastener manufacturers do not welcome users of metric fitting type to inter-change other products, because there is difference in original designs, even if two come from the same designer, they may differ in details. On the other hand, interchangeability in this product is advertised as a positive by some companies. Those same companies quite often offer part number cross referencing in their product literature.

China aluminium adapters are produced in a vast range of styles with manufacturers offering tees, elbows, unions, male connectors, female connectors and many others. Reducers allow the installers to change from one tube size to another, even from metric to imperial. Unlike the flared fitting, there is no set standard to manufacture the ferrule fittings. However, certain unwritten rules apply and all producers use the same method of distinguishing between metric and imperial fittings. A step, or shoulder, is machined on to the metric fitting body below the hexagon portion, and on the front end of the nut. This is also clearly seen in all the manufacturers' literature.