THREAD JOINTS

 Different Types of Threads Used in Casing and Screen:

Trapezoidal Thread - to DIN 2999 with a modify depth of DIN 4925 pitch 0.5 inch(11mm).
Trapezoida l with  Rounded   soulder-cut to   DIN103 or  BS 1104  with  a   modify  debth   to   complement pitch. Pitch 0.6 inch(11mm).
Rounded Thread- A special thread for use    on  special  duty  large  diameter  casing  with  a 14mm pitch.
Special Buttress Thread*-14mm pitch.

 

Illustrations of the various Thread Joints:
Trapezoidal Thread DIN 4925.

 

 

Flush Joint Trapezoidal Thread.
Trapezoidal Round Shoulder Thread.

 

 

Flush  Joint   with  Trapezoidal  Round       Shoulder Thread.
Buttress Thread.