Could you please clarify what you mean by "NPT threads"? Are you referring to the National Pipe Thread standard, which is a type of thread used for piping and fittings? If so, the standard size of NPT threads can vary depending on the specific size and class of the pipe or fitting. For example, a 1/2" NPT thread would have a different size and pitch than a 1" NPT thread. Additionally, the standard size may also vary based on the specific type of NPT thread, such as tapered or straight. Could you provide more context or specify which type and size of NPT thread you are inquiring about?
            
            
            
            
            
            
           
          
          
            7 answers
            
            
  
    
    SophieJones
    Thu Aug 15 2024
   
  
    Suppliers typically offer pipes and fittings in these standard dimensions.
  
  
 
            
            
  
    
    Arianna
    Thu Aug 15 2024
   
  
    For specialized purposes, such as compressed air systems, smaller sizes below 1⁄8 inch may be utilized.
  
  
 
            
            
  
    
    Martino
    Thu Aug 15 2024
   
  
    In the realm of plumbing and piping, standardized sizes are crucial for compatibility and efficiency. 
  
  
 
            
            
  
    
    Giuseppe
    Thu Aug 15 2024
   
  
    Conversely, for larger-scale projects requiring pipes exceeding 6 inches in diameter, alternative joining methods are often employed due to practical considerations.
  
  
 
            
            
  
    
    amelia_jackson_environmentalist
    Thu Aug 15 2024
   
  
    The most commonly employed sizes in the United States range from 1⁄8 inch to 6 inches.