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Decimal Equivalents and Tap Sizes of Fraction, Number, Letter and Metric Sizes
Recommended tap drill sizes for approximately 75% depth of thread
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   NPS 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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