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      Hilong Super High Torque Connection
      


      

      

      Product Introduction
      

      


      

      HLST®& HLIST®are new generation super high torque double shoulder connection developed based on the structure of HLIDS®. 
      
HLST®& HLIST®are more suitable used in deep well drilling, ERD, HDD, sour service and critical well etc.
      
Comparing with API connection, HLST®& HLIST®have the features as follows:
      
• Improved double shoulder structure
      
• Improved thread root radius designation
      
• Optimized thread pitch and taper
      

      

      

      

            
      



            
      
                
      

       Product Advantage
      


      

      ·Super High Torsional Strength: 70% extra torsional strength over API connection;
      
·Increased anti-fatigue performance;.
      


      · While maintaining required torsional strength, it can:
      
- minimize the tool joint OD;
      
- maximize the ID;
      


      ·Reduced the internal erosion and improved hydraulic efficiency.
      


      


       
      

      

      

            
      


            
      
                
      

      Product Specification
      


      

      (a)HLST®series including HLST®24, HLST®26, HLST®31, HLST®36, HLST®39, HLST®40, HLST®46, HLST®52, HLST®54, HLST®57, HLST®66 and etc.
      
(b)HLST®connection performance, please see table A.7 or table B.7.
      


      (c)HLIST® series including HLIST®38, HLIST®39, HLIST®46, HLIST®50, HLIST®54, HLIST®57 and etc.
      
(d)HLIST®connection performance, please see table A.8 or Atable B.8.