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    Products & services
    
                            
    
                        
    
                    
    
            
    
            
    
        
    
    
    


    
    
    
        
            
    
                
    

    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.