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Drill and Tap & Die Sizes with Metric and Decimal Equivalents

1/64 17/64 33/64 49/64 .1mm 8mm 17mm
3/64 19/64 35/64 51/64 1mm 9mm 18mm
5/64 21/64 37/64 53/64 2mm 10mm 19mm
7/64 23/64 39/64 55/64 3mm 11mm 20mm
9/64 25/64 41/64 57/64 4mm 12mm 21mm
11/64 27/64 43/64 59/64 5mm 13mm 22mm
13/64 29/64 45/64 61/64 6mm 14mm 23mm
15/64 31/64 47/64 63/64 7mm 15mm 24mm
          16mm 25mm
             
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Minimum and maximum drill sizes are indicated for many taps.  A smaller hole will have tighter threads, but will be more work to tap in hard materials.  A smaller hole (Where 75% of the thread surfaces will make contact) is a good idea in soft metals such as copper or brass.  Not responsible for errors and omissions regarding the content of this page.
Read "This Old House Magazine" for Home Improvement Tips and Ideas
Fraction
(Inches)
Decimal
(Inches)
Milli-
meters
Drill
Number
or Letter
Tap
(Size of
Screw &
Threads
per Inch)
Tap
Drill
Size
Fine
Pitch
Coarse
Pitch
  .003937 .1mm          
.0059055 .15
  .007874 .2          
  .0098425 .25          
  .011811 .3          
  .0135   80        
  .0145   79        
1/64 .015625 .39688          
  .015748 .4          
  .0160   78        
  .0177165 .45          
  .0180   77        
  .019685 .5          
  .0200   76        
  .0210   75        
  .0216535 .55          
  .0225   74        
  .023622 .6          
  .0240   73        
  .0250   72        
  .0255905 .65          
  .0260   71        
  .0280   70        
  .027559 .7          
  .0292   69        
  .0295275 .75          
  .0310   68        
1/32 .031250 .79375          
  .031496 .8          
  .0320   67        
  .0330   66        
  .0334645 .85          
  .0350   65        
  .035433 .9          
  .0360   64        
  .0370   63        
  .0374015 .95          
  .0380   62        
  .0390   61        
               
Try Amazon Prime 30-Day Free Trial
 
 
A Tap and Die Tool Set Comes in Handy Now and Then
Fraction
(Inches)
Decimal
(Inches)
Milli-
meters
Drill
Number
or Letter
Tap
(Size of
Screw &
Threads
per Inch)
Tap
Drill
Size
Fine
Pitch
Coarse
Pitch
  .03937 1mm       .2 .25
  .04   60        
  .041   59        
  .0413385 1.05          
  .042   58        
  .043   57        
  .043307 1.1         .25
  .0452755 1.15          
  .0465   56 0-80      
3/64 .046875 1.19063   0-80 75%     .318
  .047244 1.2mm       .2 .25
  .048     0-80      
  .0492125 1.25          
  .051181 1.3          
  .052   55 8-80 50%      
  .0531495 1.35          
  .055   54        
  .055118 1.4mm       .2 .3
  .057     1-64      
  .0570865 1.45          
  .059     1-72      
  .059055 1.5mm         .3
  .0595   53 1-64,1-72
75%
     
  .0610235 1.55          
1/16 .062500 1.58750   1-64 50%      
  .062992 1.6mm       .2 .35
  .0635   52 0      
  .0635   52 1-72 50%      
  .0649605 1.65          
  .066929 1.7mm       .2, .25 .35
  .0670   51 2-56      
  .068     2-56      
  .0688975 1.75          
  .0700   50 2-64      
  .070866 1.8mm       .2 .35
  .0728345 1.85          
  .0730   49        
  .074803 1.9          
  .0760   48 1      
  .0767715 1.95          
  .078     3-48      
5/64 .078125 1.98438   3-48      
  .0785   47 3-48      
               
 
 
"Fine Homebuilding Magazine" has Excellent Articles for Do-It-Yourselfers
 
Fraction
(Inches)
Decimal
(Inches)
Milli-
meters
Drill
Number
or Letter
Tap
(Size of
Screw &
Threads
per Inch)
Tap
Drill
Size
Fine
 Pitch
Coarse
Pitch
Threads
per
Inch
(TPI)
  .07874 M2       .25, .35 .4  
  .0807085 2.05            
  .0810   46 3-56        
  .0820   45 3-56        
  .082677 2.1            
  .0846455 2.15            
  .0860   44 4-40        
  .086614 2.2mm         .45  
  .087     4-40        
  .0885825 2.25            
  .0890   43 4-40        
  .090551 2.3mm       .25, .35 .4  
  .091     4-48        
  .0925195 2.35            
  .0935   42 4-48        
3/32 .093750 2.38125   4-48        
  .094488 2.4            
  .0960   41          
  .0964565 2.45            
  .0980   40 5-40        
  .098425 2.5mm       .35 .45  
  .0995   39 5-40        
  .100     5-40        
  .1015   38 5-44        
  .102     5-44        
  .102362 2.6mm       .25, .35 .45  
  .1040   37          
  .106299 2.7            
  .1065   36 6-32        
  .107              
  .1082675 2.75            
7/64 .109375 2.77813   6-32        
  .1100   35 6-32        
  .110236 2.8            
  .1110   34 6-32        
  .1130   33 6-32, 6-40        
  .114173 2.9            
  .1160   32 6-32, 6-40        
  .11811 M3     41, 2.6mm
75%
.35   73 TPI
  .11811 M3     2.5mm 75%   .5 51 TPI
  .1200   31 6-40        
  .122047 3.1            
1/8 .125000 3.17500            
  .125984 3.2            
  .1279525 3.25            
  .1285 3.26390 30          
  .129921 3.3            
  .133              
  .133858 3.4            
  .1360 3.45440 29 8-32, 8-36
75%
       
  .137795 3.5mm       .35 .6  
  .1405 3.56870 28 8-32, 8-36        
9/64 .140625 3.571875            
  .141732 3.6            
  .1440   27 8-32 50%        
  .145669 3.7            
  .1470   26 8-36 50%        
  .1476375 3.75            
  .148              
  .1495   25 10-24        
  .149606 3.8            
  .1520   24 10-24        
  .153543 3.9            
  .1540   23 10-24        
5/32 .156250 3.96875   10-24        
  .1570   22 10-24        
                 
 
Use a Heavy Duty 4,000 LB Bolt Cutter for Chores Around the House
 
Fraction
(Inches)
Decimal
(Inches)
Milli-
meters
Drill
Number
or Letter
Tap
(Size of
Screw &
Threads
per Inch)
Tap
Drill
Size
Fine
Pitch
Coarse
Pitch
  .15748 M4       .5 .7
  .1590   21 10-24, 10-32      
  .1610   20 10-24, 10-32      
  .161417 4.1          
  .165354 4.2          
  .1660   19 10-32      
  .1673225 4.25          
  .169291 4.3          
  .1695   18 10-32      
11/64 .171875 4.36563          
  .1730   17        
  .173228 4.4          
  .174            
  .1770   16 12-24      
  .177165 4.5mm         .75
  .1800   15 12-24      
  .181102 4.6          
               
               
  .1820   14 12-28      
  .1850 4.7 13 12-28, 12-32      
  .1870075 4.75          
3/16 .187500 4.76250          
  .188976 4.8 12 12-24, 12-28      
  .1910   11 12-28      
  .192913 4.9          
  .1935   10        
  .1960   9        
  .196850 M5       .5 .8
  .1990   8        
  .200            
  .200787 5.1          
13/64 .203125 5.15938   1/4-20      
  .204724 5.2          
  .2055   5 1/4-20      
  .2066925 5.25          
               
  .208661 5.3          
  .2090   4 1/4-20      
  .212598 5.4          
  .2130   3 1/4-28      
  .214     1/4-28      
  .216535 5.5          
7/32 .218750 5.55625   1/4-20, -28, -32       
  .220472 5.6          
  .2210   2        
  .224409 5.7          
  .2263775 5.75          
  .2280   1 1/4-28, 1/4-32      
  .228346 5.8          
  .232283 5.9          
  .2340   A        
15/64 .234375  5.95313          
               
 
1/64 3/64 5/64 7/64 9/64 11/64 13/64 15/64 17/64 19/64 21/64 23/64 25/64 27/64 29/64 31/64
33/64 35/64 37/64 39/64 41/64 43/64 45/64 47/64 49/64 51/64 53/64 55/64 57/64 59/64 61/64 63/64
 
Metric Screw Taps, Sizes 3mm to 12mm with Coarse and Fine Thread Pitches
 
Fraction
(Inches)
Decimal
(Inches)
Milli-
meters
Drill
Number
or Letter
Tap
(Size of
Screw &
Threads
per Inch)
Tap
Drill
Size
Fine
Pitch
Coarse
Pitch
  .23622 M6       .75 1
  .238   B        
  .240157 6.1          
  .242   C        
  .244094 6.2          
  .246 6.25 D        
  .248031 6.3          
1/4 .25 6.35000 E        
  .251968 6.4          
  .255905 6.5          
  .257   F 5/16-18      
  .259842 6.6          
  .261   G 5/16-18      
  .263779 6.7          
17/64 .265625 6.74688          
  .2657475 6.75          
  .266   H 5/16-24      
  .267716 6.8          
  .271     5/16-24      
  .271653 6.9          
  .272   I 5/16-24      
  .27559 7mm         1
  .277   J        
  .279527 7.1          
  .2811   K        
9/32 .28125 7.14375          
  .283464 7.2          
  .2854325 7.25          
  .287401 7.3          
  .29   L        
  .291338 7.4          
  .295   M        
  .295275 7.5          
19/64 .296875 7.54063          
  .299212 7.6          
  .302   N        
  .303149 7.7          
  .3051175 7.75          
  .307086 7.8          
  .311023 7.9          
  .312     3/8-16      
5/16 .3125 7.9375   3/8-16      
               
 
 
 
 
Fraction
(Inches)
Decimal
(Inches)
Milli-
meters
Drill
Number
or Letter
Tap
(Size of
Screw &
Threads
per Inch)
Tap
Drill
Size
Fine
Pitch
Coarse
Pitch
  .31496 M8       1 1.25
  .316   O 3/8-16      
  .318897 8.1          
  .322834 8.2          
  .323   P        
  .3248025 8.25          
  .326771 8.3          
21/64 .328125 8.33438   3/8-24      
  .330708 8.4          
  .332   Q 3/8-24      
  .333     3/8-24      
  .334645 8.5          
  .338582 8.6          
  .339   R        
  .342519 8.7          
11/32 .34375 8.73125          
  .3444875 8.75          
  .346456 8.8          
  .348   S        
  .350393 8.9          
  .35433 9mm         1.25
  .358   T        
  .358267 9.1          
23/64 .359375 9.12813   7/16-14      
  .362204 9.2          
  .3641725 9.25          
  .366     7/16-14      
  .366141 9.3          
  .368   U 7/16-14      
  .370078 9.4          
  .374015 9.5          
3/8 .375 9.525          
  .377   V        
  .377952 9.6          
  .381889 9.7          
  .385826 9.8          
  .386   W 7/16-20      
  .388     7/16-20      
  .389763 9.9          
25/64 .390625 9.92188   7/16-20      
               
 
 
This Wall Mounted Thread Checker Measures Pitch & Diameter of Nuts & Bolts
 
Fraction
(Inches)
Decimal
(Inches)
Milli-
meters
Drill
Number
or Letter
Tap
(Size of
Screw &
Threads
per Inch)
Tap
Drill
Size
Fine
Pitch
Coarse
Pitch
  .3937 M10       1.25 1.5
  .397   X        
  .404   Y        
13/32 .40625 10.31875          
  .413   Z        
  .413385 10.5          
27/64 .421875 10.71563   1/2-13      
  .423     1/2-13      
  .43307 11mm       1 1.5
7/16 .4375 11.1125          
  .45     1/2-20      
  .452755 11.5          
29/64 .453125 11.50938   1/2-20      
15/32 .46875 11.90625          
  .47244 M12       1.25, 1.5 1.75
  .479     9/16-12      
31/64 .484375 12.30313   9/16-12      
  .492125 12.5          
1/2" .5" 12.7   9/16-18      
  .507     9/16-18      
  .51181 13mm          
33/64 .515625 13.09688          
17/32 .53125 13.49375   5/8-11      
  .531495 13.5          
  .534     5/8-11      
35/64 .546875 13.89063          
               
 
 
 
 
Fraction
(Inches)
Decimal
(Inches)
Milli-
meters
Drill
Number
or Letter
Tap
(Size of
Screw &
Threads
per Inch)
Tap
Drill
Size
Fine
Pitch
Coarse
Pitch
  .55118 M14       1.5 2
9/16 .5625 14.28750   5/8-18      
  .569     5/8-18      
  .570865 14.5          
37/64 .578125 14.68438          
  .59055 15mm          
19/32 .59375 15.08125          
39/64 .609375 15.47813          
  .610235 15.5          
5/8 .625 15.875          
  .62992 M16       1.5  
41/64 .640625 16.27188          
  .649605 16.5          
  .65     3/4-10      
21/32 .65625 16.66875   3/4-10      
  .66929 17mm          
43/64 .671875 17.06563          
11/16 .6875 17.4625   3/4-16      
  .688     3/4-16      
  .688975 17.5          
45/64 .703125 17.85938          
  .70866 M18       1.5  
23/32 .71875 18.25625          
  .728345 18.5          
47/64 .734375 18.65313          
  .74803 19mm          
3/4 .75 19.05          
  .764     7/8-9      
49/64 .765625 19.44668   7/8-9      
  .767715 19.5          
25/32 .78125 19.84375          
               
 
 
Search for a Screw Thread Gauge
Fraction
(Inches)
Decimal
(Inches)
Milli-
meters
Drill
Number
or Letter
Tap
(Size of
Screw &
Threads
per Inch)
Tap
Drill
Size
Fine
Pitch
Coarse
Pitch
  .7874 M20       1.5  
51/64 .796875 20.24063   7/8-14      
  .804     7/8-14      
13/16 .8125 20.6375          
  .82677 21mm          
53/64 .828125 21.03438          
27/32 .84375 21.43125          
  .846455 21.5          
               
               
55/64 .859375 21.83813          
  .86614 22mm          
7/8 .875 22.225   1"-8      
  .885825 22.5          
57/64 .890625 22.62187   1"-8      
  .905510 23mm          
29/32 .90625 23.01875          
59/64 .921875 23.41563   1"-12, 1"-14      
  .925195 23.5          
  .929     1"-14      
15/16 .9375 23.81250   1"-14      
  .94488 M24       1.5  
61/64   24.209          
  .964565 24.5          
  .982 25mm   1 1/8"-7      
63/64 .984375 25.00312   1 1/8"-7      
1" 1.000" 25.40000   1 1/8"-7      
               
 
 
 
More Data
Not responsible for errors and omissions regarding the content of this page

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Updated December 13, 2015

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