non-threaded pipe thread sealing

Non-threaded sealing pipe thread is not primarily for low pressure , gas pipeline , connecting it with packing or sealing mass ( flax, lead, Teflon tape, etc. ) , in order to prevent leakage. 5 non-threaded sealing pipe threads and threaded pipe thread sealing point is the same : both are the same tooth type 55 °, the same size thread pitch , tooth height , basically the same diameter . 6 non-threaded sealing  Hydraulic hose fittingsand sealing threaded pipe thread difference is Sealed with a screw thread inside a cylindrical pipe thread thread and taper thread in two forms , male taper thread only one form .
 Non-threaded sealing pipe thread and external thread either have only one form of cylindrical thread .Two kinds of threaded portion size tolerances are differentNon-threaded inner cylindrical pipe thread sealing can be sealed with a threaded outer tapered pipe thread connected , but non-threaded outer cylindrical pipe thread sealing can not use thread sealing pipe threads forming the inner thread sealing connections.