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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.