| Machine 
                    Screw Sizes | 
                 
                 
                  | Size | 
                  @ | 
                  Thread per 
                    inch | 
                  @ | 
                 
                 
                  | No. | 
                  (u)NC | 
                  (u)NF | 
                  (u)NS | 
                 
                 
                   0 
                    1 
                    2 
                    3 
                    4  | 
                    
                    64 
                    56 
                    48 
                    40 | 
                  80 
                    72 
                    64 
                    56 
                    48 | 
                    
                    56 
                     
                     
                    32¥336 | 
                 
                 
                  5 
                    6 
                    8 
                    10 
                    12 
                     | 
                   40 
                    32 
                    32 
                    24 
                    24 | 
                  44 
                    40 
                    36 
                    32 
                    28 | 
                   
                    36 
                    40 
                    30 
                    32 | 
                 
                 
                  | 14 | 
                  20 | 
                  24 | 
                  @ | 
                 
               
             | 
           
         
       | 
       
        
           
             
              
                 
                  | Metric 
                    Sizes | 
                 
                 
                  | Size | 
                  Pitch  
                    Coarse  | 
                   
                     Pitch 
                      Fine 
                   | 
                 
                 
                  1.0 
                    1.1 
                    1.2 
                    1.4 
                    1.6 | 
                  0.25 
                    0.25 
                    0.25 
                    0.3 
                    0.35 | 
                   
                     0.2 
                      0.2 
                      0.2 
                      0.2 
                      0.2 
                   | 
                 
                 
                  1.7 
                    1.8 
                    2.0 
                    2.2 
                    2.3  | 
                  0.35 
                    0.35 
                    0.4 
                    0.4/0.45 
                    0.4 | 
                  0.2 
                    0.2 
                    0.25 
                    0.25 
                    0.25 | 
                 
                 
                  2.5 
                    2.6 
                    3.0 
                    3.5 
                    4.0 | 
                  0.45 
                    0.45 
                    0.5 
                    0.6 
                    0.7 | 
                   
                     0.25 
                      0.25 
                      0.35 
                      0.35 
                      0.50  
                   | 
                 
               
             | 
           
         
       | 
       
        
           
             
              
                 
                  | BA Sizes | 
                 
                 
                  BA NO.14 
                    BA NO.13 
                    BA NO.12 
                    BA NO.11 
                    BA NO.10 | 
                 
                 
                  BA NO.9 
                    BA NO.8 
                    BA NO.7 
                    BA NO.6 
                    BA NO.5 | 
                 
                 
                  BA NO.4 
                    BA NO.3 
                    BA NO.2 
                    BA NO.1 
                    BA NO.0 | 
                 
               
             | 
           
         
       | 
       
        
           
             
              
                 
                  | Sewing 
                    Machine Sizes | 
                 
                 
                  | Nomal | 
                  Thread | 
                 
                 
                  | Diameter 
                    inch | 
                  per inch | 
                 
                 
                  SM1/16 
                    SM5/64 
                    SM3/32 
                    SM3/32 
                    SM1/8  | 
                  80 
                    64  
                    100 
                    56 
                    48  | 
                 
                 
                  SM1/8 
                    SM9/64 
                    SM11/64 
                    SM11/64 
                    SM11/64 | 
                  44 
                    40 
                    40 
                    40 
                    32  | 
                 
                 
                  SM3/16 
                    SM3/16 
                    SM3/16 
                    SM3/16 
                    SM13/64 | 
                   
                     40 
                      32 
                      28 
                      24 
                      32  
                   | 
                 
                 
                  SM7/32 
                    SM15/64 
                    SM1/4 
                    SM1/4 
                    SM1/4 | 
                  32 
                    28 
                    40 
                    28 
                    24  | 
                 
               
             | 
           
         
       |