Common unit of thread
-Inch : (UTS) the United States and Canada
-Millimeter : ISO, (BSP) British, (JIS) Japan
Standard threads
Standers for machine threads have existed since the mid nineteenth century, to facilitate
Compatibility between different manufacturers and user.
ISO standard threads :
The metric ISO screw thread are the world-wide most commonly used type of general-purpose
Screw thread. They were one of the first international agreed when the international Organization For Standardization was set up in 1947
Unified thread standard (UTS) :
The Unified Thread Standard (UTS), which is still in common use in the Unitedstates and CanadaIt has
the same 60 degree profile as the ISO metric screw thread used in the rest of the world, but The characteristic dimensions of each UTS thread were chosen as an inchfraction rather a round.Millimeter value. This standard include
-Unified Coarse (UNC)
-Unified Fine (UNF)-unified Extra Fine ( UNEF)
-Unified Special (UNS)
-National pipe thread (NPT)
British standard pipe thread (BSP) :
The British standard pipe thread is a family of standard screw thread types that has been
Adopted internationality for interconnecting and sealing ends by mating and external (male)
With and internal (female) thread.
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