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Drill Tap Chart

 
 

Inch thread chart

Metric tap thread chart
 

Coarse Thread

  

Fine Thread

  

Coarse Thread

 Fine Thread 
  Tap  Drill   Tap Drill   Tap Drill   Tap Drill
  #0-80 3/64"   #1-72 #53   1mm x .25 .75mm   4 mm x .35 3.6mm
  #1-64 #53   #2-64 #50   1.1 x .25 .85   4 x .5 3.5
  #2-56 #51   #3-56 #46   1.2 x .25 .95   5 x .5 4.5
  #3-48 5/64"   #4-48 #42   1.4 x .3 1.1   6 x .5 5.5
  #4-40 #43   #5-44 #37   1.6 x .35 1.25   6 x .75 5.25
  #5-40 #39   #6-40 #33   1.7 x .35 1.3   7 x .75 6.25
  #6-32 #36   #8-36 #29   1.8 x .35 1.45   8 x .5 7
  #8-32 #29   #10-32 #21   2 x .4 1.6   8 x .75 7.25
  #10-24 #25   #12-28 #15   2.2 x .45 1.75   8 x 1 7.5
  #12-24 #17   1/4-28 #3   2.5 x .45 2.05   9 x 1 8
  1/4-20 #7   5/16-24 I   3 x .5 2.5   10 x .75 9.25
  5/16-18 F   3/8-24 Q   3.5 x .6 2.9   10 x 1 9
  3/8-16 5/16   7/16-20 W   4 x .7 3.3   10 x 1.25 8.8
  7/16-14 U   1/2-20 29/64   4.5 x .75 3.7   11 x 1 10
  1/2-13 27/64   9/16-18 33/64   5 x .8 4.2   12 x .75 11.25
  9/16-12 31/64   5/8-18 37/64   6 x 1 5   12 x 1 11
  5/8-11 17/32   3/4-16 11/16   7 x 1 6   12 x 1.5 10.5
  3/4-10 21/32   7/8-14 13/16   8 x 1.25 6.8   14 x 1 13
  7/8-9 49/64   1"-12 15/16   9 x 1.25 7.8   14 x 1.25 12.8
  1"-8 7/8   1-1/8-12 1-3/64   10 x 1.5 8.5   14 x 1.5 12.5
  1-1/8-7 63/64   1-1/4-12 1-11/64   11 x 1.5 9.5   16 x 1 15
  1-1/4-7 1-7/64   1-1/2-12 1-27/64   12 x 1.75 10.2   16 x 1.5 14.5
  1-1/2-6 1-11/32   1-3/4-12 1-43/64   14 x 2 12   18 x 1 17
  1-3/4-5 1-35/64   2"-12 1-59/64   16 x 2 14   18 x 2 16
  2"-4-1/2 1-25/32   18 x 2.5 15.5   20 x 1 19
    20 x 2.5 17.5   20 x 1.5 18.5
      22 x 2.5 19.5   20 x 2 18
  24 x 3 21   22 x 1 21
  27 x 3 24   22 x 1.5 20.5
  30 x 3.5 26.5   22 x 2 20
  33 x 3.5 29.5   24 x 1.5 22.5
  36 x 4 32   24 x 2 22
  39 x 4 35   26 x 1.5 24.5
    27 x 1.5 25.5
    27 x 2 25
    28 x 1.5 26.5
    30 x 1.5 28.5
    30 x 2 28
    33 x 2 31
 

Pipe Tap Thread Sizes

   36 x 3 33
  39 x 3 36
  Taper Pipe NPT   Straight Pipe sizes NPS    
  Tap  Drill   Tap Drill    
  1/8-27 R   1/8-27 S    
  1/4-18 7/16   1/4-18 29/64    
  3/8-18 37/64   3/8-18 19/32    
  1/2-14 23/32   1/2-14 47/64    
  3/4-14 59/64   3/4-14 15/16    
  1"-11-1/2 1-5/32   1"-11-1/2 1-3/16    
  1-1/4-11-1/2 1-1/2   1-1/4-11-1/2 1-33/64    
  1-1/2-11-1/2 1-47/64   1-1/2-11-1/2 1-3/4    
  2"-11-1/2 2-7/32   2"-11-1/2 2-7/32    
  2-1/2-8 2-5/8   2-1/2-8 2-21/32    
  3"-8 3-1/4   3"-8 3-9/32    
  3-1/2-8 3-3/4   3-1/2-8 3-25/32    
  4"-8 4-1/4   4"-8 4-9/32    
     
Drill Tap size chart