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Size And Thread Reference Table

Basic Major Diameter
Metric
American
Nominal Dia. in mm
Screw
Pitch In mm
Nominal Diameter
Threads / Inch
Inch
mm
Coarse
Fine
MPT
UNC
UNF
UNEF
NPT
0.010 0.25 0.25   0.075              
0.012 0.30 0.3   0.075              
0.014 0.35 0.35   0.09              
0.016 0.40 0.4   0.1              
0.018 0.45 0.45   0.1              
0.020 0.50 0.5   0.125              
0.024 0.60 0.6   0.15              
0.028 0.70 0.7   0.175              
0.031 0.79                    
0.032 0.80 0.8   0.2              
0.035 0.90 0.9   0.225              
0.039 1.00 1
YES
 0.25
0.2
            
0.047 1.20 1.2
YES
 0.25
0.2
            
0.051 1.30                    
0.055 1.40 1.4
YES
 0.3
0.2, 0.25
            
0.059 1.50                    
0.060 1.52          
0
   80    
0.063 1.60 1.6
YES
 0.35
0.2
            
0.067 1.70 1.7
YES
 0.35
0.2, 0.25
            
0.071 1.80 1.8
YES
 0.35
0.2
            
0.073 1.85          
1
 64 72    
0.075 1.90                    
0.079 2.00 2
YES
 0.4
0.25, 0.35
            
0.086 2.18          
2
 56 64    
0.091 2.30 2.3
YES
 0.4
0.25, 0.35
            
0.098 2.50 2.5
YES
 0.45
0.35
            
0.990 2.51          
3
 48 56    
0.102 2.60 2.6
YES
 0.45
0.25, 0.35
            
0.110 2.80                    
0.112 2.84          
4
 40 48    
0.118 3.00 3
YES
 0.5
0.35, 0.6
            
0.125 3.18          
5
 40 44    
0.126 3.20                    
0.138 3.50 3.5
YES
 0.6
0.35, 0.5
  
6
 32 40    
0.142 3.60                    
0.157 4.00 4
YES
 0.7
0.5, 0.75
            
0.161 4.10                    
0.164 4.17          
8
 32 36    
0.177 4.50 4.5   0.75
0.5
            
0.185 4.70                    
0.188 4.76                    
0.190 4.83          
10
 24 32    
0.197 5.00 5
YES
 0.8
0.5, 0.75, 0.9
            
0.209 5.30                    
0.216 5.49          
12
 24 28 32  
0.219 5.56                    
0.236 6.00 6
YES
 1
0.5, 0.75
            
0.250 6.35          
1/4
 20 28 32  
0.276 7.00 7
YES
 1
0.5, 0.75
            
0.281 7.14                    
0.313 7.94          
5/16
 18 24 32  
0.313 7.94          
1/16
       27
0.315 8.00 8
YES
 1.25
0.5, 0.75, 1
 1          
0.354 9.00 9   1.25
0.75, 1
            
0.375 9.53          
3/8
 16 24 32  
0.383 9.73                    
0.394 10.00 10
YES
 1.5
1.25, 1, 0.75
 1          
0.405 10.29          
1/8
       27
0.433 11.00 11   1.5
1, 0.75, 1.25
            
0.438 11.11          
7/16
 14 20 28  
0.472 12.00 12
YES
 1.75
1, 1.25, 1.5
 1.5          
0.500 12.70          
1/2
 13 20 28  
0.518 13.16                    
0.540 13.72          
1/4
       18
0.551 14.00 14
YES
 2
1.25, 1.5
            
0.563 14.29          
9/16
 12 18 24  
0.625 15.88          
5/8
 11 18 24  
0.630 16.00 16
YES
 2
1, 1.25, 1.5
 1.5          
0.656 16.66                    
0.675 17.15          
3/8
       18
0.688 17.46          
11/16
     24  
0.709 18.00 18
YES
 2.5
1, 1.5, 2
 1.5          
0.750 19.05          
3/4
 10 16 20  
0.787 20.00 20
YES
 2.5
2, 1.5
 1.5          
0.813 20.64          
13/16
     20  
0.825 20.96                    
0.840 21.34          
1/2
       14
0.866 22.00 22
YES
 2.5
2, 1.5, 1
 1.5          
0.875 22.23          
7/8
 9 14 20  
0.902 22.91                    
0.938 23.81          
15/16
     20  
0.945 24.00 24
YES
 3
2, 1.5, 1
            
1.000 25.40          
1
 8 12 20  
1.041 26.44                    
1.050 26.67          
3/4
       14
1.063 27.00 27
YES
 3
2, 1.5, 1
  
1 1/16
   12 18  
1.102 28.00 28    
2, 1.5, 1
            
1.125 28.58          
1 1/8
 7 12 18  
1.181 30.00 30
YES
 3.5
3, 2, 1.5
            
1.188 30.16          
1 3/16
     18  
1.189 30.20                    
1.250 31.75          
1 1/4
 7 12 18  
1.260 32.00 32    
2, 1.5, 1
            
1.299 33.00 33
YES
 3.5
3, 2, 1.5
            
1.309 33.25                    
1.313 33.34          
1 5/16
     18  
1.315 33.40          
1
      
11/12
1.339 34.00 34    
2, 1.5, 1
            
1.375 34.93          
1 3/8
 6 12 18  
1.378 35.00 35    
1.5, 1, 2
            
1.417 36.00 36
YES
 4
3, 2, 1.5
            
1.438 36.51          
1 7/16
     18  
1.457 37.00 37    
1.5
            
1.492 37.90                    
1.496 38.00 38    
1.5, 2
            
1.500 38.10          
1 1/2
 6 12 18  
1.535 39.00 39
YES
 4
3, 2, 1.5
            
1.563 39.69          
1 9/16
     18  
1.575 40.00 40    
3, 2, 1.5
            
1.625 41.28          
1 5/8
     18  
1.650 41.91                    
1.654 42.00 42
YES
 4.5
4, 3, 2, 1.5
            
1.660 42.16          
1 1/4
       11 1/2
1.688 42.86          
1 11/16
     18  
1.732 44.00      
1.5
            
1.745 44.32                    
1.750 44.45          
1 3/4
 5      
1.772 45.00 45
YES
 4.5
4, 3, 2, 1.5
            
1.811 46.00 46    
1.5
            
1.882 47.80                    
1.890 48.00 48
YES
 5
4, 3, 2, 1.5
  
       
1.900 48.26           1 1/2       11 1/2
1.969 50.00 50    
3, 2, 1.5
            
2.000 50.80          
2
 4 1/2      
2.047 52.00 52
YES
 5
4, 3, 2, 1.5
            
2.205 56.00 56
YES
 5.5
4, 3, 2, 1.5
            
2.250 57.15          
2 1/4
 4 1/2      
2.362 60.00 60
YES
 5.5
4, 3, 2, 1.5
            
2.375 60.33          
2
       11 1/2
2.500 63.50          
2 1/2
 4      
2.520 64.00 64
YES
 6
4, 3, 2, 1.5
            
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