Tap and Drill Chart

 

 

 
Decimal Equivalents and Tap Sizes of Fraction, Number, Letter and Metric Sizes
Recommended tap drill sizes for approximately 75% depth of thread
Click the following link for a drill sizes for special tap sizes 
SIZES
DEC.
INCHES
TAP SIZES
To be used with
drills as indicated
 SIZES
DEC.
INCHES
TAP SIZES
To be used with
drills as indicated
 SIZES
DEC.
INCHES
TAP SIZES
To be used with
drills as indicated
 SIZES
DEC.
INCHES
TAP SIZES
To be used with
drills as indicated
 SIZES
DEC.
INCHES
TAP SIZES
To be used with
drills as indicated
97 .0059     58 .0420     27 .1440     H .2660     17/32 .5312 5/8-11
.15mm .0059     57 .0430     3.7mm .1457     6.8mm .2677     13.5mm .5315  
96 .0063     1.1mm .0433     26 .1470 3/16-24NS   6.9mm .2717     35/64 .5469  
.16mm .0063     1.15mm .0453     3.75mm .1476 m4.5x0.75   I 2720 5/16-24 NF   14mm 5512 m16x2
95 .0067     56 .0465     25 .1495 #10-24   7mm .2756 m8x1   9/16 .5625  
.17mm .0067     3/64 .0469 #0-80   3.8mm .1496     J .2770     14.5mm .5709 m16x1.50
94 .0071     1.2mm .0472     24 .1520     7.1mm .2795     37/64 .5781 3/8-18  NPT PIPE  5/8-18 NF
.18mm .0071     1.25mm .0492 m1.6x0.35   3.9mm .1535     K .2810     15mm .5906  
93 .0075     1.3mm .0512     23 .1540     9/32 .2812 5/16-32 NS   19/32 .5938 3/8-18  NPS PIPE
.19mm .0075     55 .0520     5/32 .1562     7.2mm .2835     39/64 .6094  
92 .0079     1.35mm .0531     22 .1570 3/16-32 NS   7.25mm .2854     15.5mm .6102 m18x2.5
.2mm .0079     54 .0550     4mm .1575     7.3mm .2874     5/8 .6250 11/16-16 NS
91 .0083     1.4mm .0551     21 .1590 #10-32   L .2900     16mm .6299 n18x2.0
.21mm .0083     1.45mm .0571 m1.8x0.35   20 .1610     7.4mm .2913     41/64 .6406  
90 .0087     1.5mm .0591     4.1mm .1614     M .2950     16.5mm .6496  
.22mm .0087     53 .0595 #1-64,72   4.2mm .1654 m5x0.8   7.5mm .2953     21/32 .6562 3/4-10 NC
89 .0091     1.55mm .0610     19 .1660     19/64 .2969     17mm .6693  
.23mm .0091     1/16 .0625     4.25mm .1673     7.6mm .2992     43/64 .6719  
.24mm .0094     1.6mm .0630 m2x0.4   4.3mm .1693     N .3020     11/16 .6875 3/4-16 NF
88 .0095     52 .0635     18 .1695     7.7mm .3031     17.5mm .6890 m20x2.5
.25mm .0098     1.65mm .0650     11/64 .1719     7.75mm .3051 m9x1.25   45/64 .7031  
87 .0100     1.7mm .0669     17 .1730     7.8mm .3171     18mm .7087 m20x2.0
.26mm .0102     51 .0670 #2-56   4.4mm .1732     7.9mm .3110     23/32 .7188 1/2-14  NPT PIPE
86 .0105     1.75mm .0689 m2.2x0.45   16 .1770 #12-24   5/16 .3125 3/8-16 NC   18.5mm .7283 m20x1.5
.27mm .0106     50 .0700 #2-64   4.5mm .1772     8mm .3150     47/64 .7344 1/2-14  NPS PIPE
85 .0110     1.8mm .0709     15 .1800     O .3160     19mm .7480  
.28mm .0110     1.85mm .0728     4.6mm .1811     8.1mm .3189     3/4 .7500  
.29mm .0114     49 .0730     14 .1820 #12-28   8.2mm .3228     49/64 .7656 7/8-9 NC
84 .0115     1.9mm .0748 m2.3x0.4   13 .1850     P .3230     19.5mm .7677 m22x2.5
.3mm .0118     48 .0760     4.7mm .1850     8.25mm .3248     25/32 .7812  
83 .0120     1.95mm .0768     4.75mm .1870     8.3mm .3268     20mm .7874 m22x2.0
82 .0125     5/64 .0781     3/16 .1875     21/64 .3281     51/64 .7969  
.32mm .0126     47 .0785 #3-48   4.8mm .1890     8.4mm .3307     20.5mm .8071 m22x1.5
81 .0130     2mm .0787     12 .1890 7/32-32 NS   Q .3320 3/8-24 NF   13/16 .8125 7/8-14 NF
.34mm .0134     2.05mm .0807 m2.5x45   11 .1910     8.5mm .3346 m10x1.5   21mm .8268 m24-3
80 .0135     46 .0810     4.9mm .1929     8.6mm .3386     53/64 .8281  
.35mm .0138     45 .0820 #3-56   10 .1935     R .3390 1/8-27   NPT PIPE   27/32 .8438  
.36mm .0142     2.1mm .0827     9 .1960     8.7mm .3425     21.5mm .8465  
79 .0145     2.15mm .0846 m2.6x0.45   5mm .1969 m6x1   11/32 .3438     55/64 .8594  
.38mm .0150     44 .0860 #4-36   8 .1990     8.75mm .3445 m10x1.25   22mm .8661 m24x2
1/64 .0156     2.2mm .0866     5.1mm .2008     8.8mm .3465     7/8 .8750 1-8 NC
.4mm .0157     2.25mm .0886     7 .2010 1/4-20   S .3480 1/8-27   NPS PIPE   22.25mm .8760  
78 .0160     43 .0890 #4-40   13/64 .2031     8.9mm .3504     22.5mm .8858 m24x1.50
.42mm .0165     2.3mm .0906     6 .2040     9mm .3543 m10.x1.00   57/64 .8906  
.44mm .0173     2.35mm .0925     5.2mm .2047     T .3580     23mm .9055  
.45mm .0177     42 .0935 #4-48   5 .2055     9.1mm .3583     29/32 .9062  
77 .0180     3/32 .0938     5.25mm .2067 m6x0.75   23/64 .3594     59/64 .9219 3/4-14  NPT PIPE
.46mm .0181     2.4mm .0945     5.3mm .2087     9.2mm .3622     23.5mm .9252  
.48mm .0189     41 .0960     4 .2090 1/4-20   9.25mm .3642     15/16 .9375 3/4-14  NPS PIPE  1-1/4 NF
.5mm .0197     2.45mm .0965     5.4mm .2126     9.3mm .3661     24mm .9449  
76 .0200     40 .0980     3 .2130 1/4-28   U .3680 7/16-14 NC   61/64 .9531  
75 .0210     2.5mm .0984 m3-0.5   5.6mm .2165     9.4mm .3701     24.5mm .9646  
.55mm .0217     39 .0995     7/32 .2188     9.5mm .3740 m11x1.5   31/32 .9688  
74 .0225     38 .1015 #5-40   5.6mm .2205     3/8 .3750     25mm .9843 m27-2
.6mm .0236     2.6mm .1024     2 .2210     V .3770     63/64 .9844 1-1/8-7 NC
73 .0240     37 .1040 #5-44   5.7mm .2244     9.6mm .3780     1 1.0000  
72 .0250     2.7mm .1063     5.75mm .2264     9.7mm .3819     25.5mm 1.0039  
.65mm .0256     36 .1065 #6-32   1 .2280     9.75mm .3839     1-1/64 1.0156  
71 .0260     2.75mm .1083     5.8mm .2283     9.8mm .3858     26mm 1.0236  
.7mm .0276     7/64 .1094     5.9mm .2323     W .3860     1-1/32 1.0312  
70 .0280     35 .1100     A .2340     9.9mm .3898     26.5mm 1.0433 m30x3.5
69 .0292     2.8mm .1102     15/64 .2344     25/64 .3906 7/16-20   1-3/64 1.0469 1-1/8-12 NF
.75mm .0295     34 .1110     6mm .2362 m7x1   10mm .3937 m12x1.75   1-1/16 1.0625  
68 .0310     33 .1130 #6-40   B .2380     X .3970     27mm 1.0630  
1/32 .0312     2.9mm .1142 m3.5x0.6   6.1mm .2402     Y .4040     1-5/64 1.0781  
.8mm .0315     32 .1160     C .2420     13/32 .4062     27.5mm 1.0827  
67 .0320     3mm .1181     6.2mm .2441     Z .4130     1-3/32 1.0928  
66 .0330     31 .1200     D .2460 1/16-27 NPT PIPE   10.5mm .4134 m12x1.25   28mm 1.1024 m30x2.0
.85mm .0335     3.1mm .1220     6.25mm .2461     27/64 .4219 1/2-13   1-7/64 1.1094 1-1/4-7 NC
65 .0350     1/8 .1250 5/32-32 NS   6.3mm .2480     11mm .4331     28.5mm 1.1220  
.9mm .0354     3.2mm .1260     E .2500     7/16 .4375 1/4-18   NPT PIPE   1-1/8 1.1250  
64 .0360     3.25mm .1280     1/4 .2500 1/16-27 NPS PIPE   11.5mm .4528     1-9/64 1.1406  
63 .0370     30 .1285 5/32-36 NS   6.4mm .2520     29/64 .4531 1/4-18   NPS PIPE  1/2-20   29mm 1.1417  
.95mm .0374     3.3mm .1299 m4x0.7   6.5mm .2559     15/32 .4688     1-5/32 1.1562 1-11-1/2  NPT PIPE
62 .0380     3.4mm .1339     F .2570 5/16-18 NC   12mm .4724 m14x2   29.5mm 1.1614  
61 .0390     29 .1360 #8-32   6.6mm .2598     31/64 .4844 9/16-12   1-11/64 1.1719 1-1/4-12 NF
1mm .0394     3.5mm .1378     G .2610     12.5mm .4921 m14x1.5        
60 .0400     28 .1405     6.7mm .2638     1/2 .5000          
59 .0410     9/64 .1406     17/64 .2638     13mm .5118 m14x1.25        
1.05mm .0413     3.6mm .1417     6.75mm .2656 m8x1.25   33/64 .5156 9/16-18        
                                     

 

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