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INCH/METRIC TAP DRILL SIZES

INCH/METRIC TAP DRILL SIZES & DECIMAL EQUIVALENTS
FRACTION OR
DRILL SIZE		 DECIMAL
EQUIVALENT		 TAP SIZE   FRACTION OR
DRILL SIZE		 DECIMAL
EQUIVALENT		 TAP SIZE   FRACTION OR
DRILL SIZE		 DECIMAL
EQUIVALENT		 TAP SIZE
NUMBER   SIZE DRILLS   80 0.0135     9/64 ------------- 0.1406     U 0.3680 7/16 - 14
79 0.0145     27 0.1440     3/8 --------------- 0.3750  
1/64 ------------------ 0.0156     26 0.1470     V 0.3770  
78 0.0160     25 0.1495 10 - 24   W 0.3860  
77 0.0180     24 0.1520     25/64 ------------ 0.3906 7/16 - 20
76 0.0200     23 0.1540     X 0.3970  
75 0.0210     5/32 ------------- 0.1562     Y 0.4040  
74 0.0225     22 0.1570     13/32 ------------ 0.4062  
73 0.0240     21 0.1590 10 - 32   Z 0.4130  
72 0.0250     20 0.1610     27/64 ------------ 0.4219 1/2 - 13
71 0.0260     19 0.1660     7/16 ------------- 0.4375  
70 0.0280     18 0.1695     29/64 ------------ 0.4531 1/2 - 20
69 0.0292     11/64 ------------ 0.1719     15/32 ------------ 0.4688  
68 0.0310     17 0.1730     31/64 ------------ 0.4844 9/16 - 12
1/32 ------------------ 0.0312     16 0.1770 12 - 24   1/2 --------------- 0.5000  
67 0.0320     15 0.1800     33/64 ------------ 0.5156 9/16 - 18
66 0.0330     14 0.1820 12 - 28   17/32 ------------ 0.5312 5/8 - 11
65 0.0350     13 0.1850     35/64 ------------ 0.5469  
64 0.0360     3/16 ------------- 0.1875     9/16 ------------- 0.5625  
63 0.0370     12 0.1890     37/64 ------------ 0.5781 5/8 - 18
62 0.0380     11 0.1910     19/32 ------------ 0.5938  
61 0.0390     10 0.1935     39/64 ------------ 0.6094  
60 0.0400     9 0.1960     5/8 --------------- 0.6250  
59 0.0410     8 0.1990     41/64 ------------ 0.6406  
58 0.0420     7 0.2010 1/4 - 20   21/32 ------------ 0.6562 3/4 - 10
57 0.0430     13/64 ------------ 0.2031     43/64 ------------ 0.6719  
56 0.0465     6 0.2040     11/16 ------------ 0.6875 3/4 - 16
3/64 ------------------ 0.0469 0 - 80   5 0.2055     45/64 ------------ 0.7031  
55 0.0520     4 0.2090     23/32 ------------ 0.7188  
54 0.0550     3 0.2130 1/4 - 28   47/64 ------------ 0.7344  
53 0.0595 1-64, 72   7/32 ------------- 0.2188     3/4 --------------- 0.7500  
1/16 ------------------ 0.0625     2 0.2210     49/64 ------------ 0.7656 7/8 - 9
52 0.0635     1 0.2280     25/32 ------------ 0.7812  
51 0.0670     LETTER SIZE DRILLS A 0.2340     51/64 ------------ 0.7969  
50 0.0700 2-56, 64   15/64 ------------ 0.2344     13/16 ------------ 0.8125 7/8 - 14
49 0.0730     B 0.2380     53/64 ------------ 0.8281  
48 0.0760     C 0.2420     27/32 ------------ 0.8438  
5/64 ------------------ 0.0781     D 0.2460     55/64 ------------ 0.8594  
47 0.0785 3 - 48   1/4----------- E 0.2500     7/8 --------------- 0.8750 1 - 8
46 0.0810     F 0.2570 5/16 - 18   57/64 ------------ 0.8906  
45 0.0820 3 - 56   G 0.2610     29/32 ------------ 0.9062  
44 0.0860     17/64 ------------ 0.2656     59/64 ------------ 0.9219 1 - 12
43 0.0890 4 - 40   H 0.2660     15/16 ------------ 0.9375  
42 0.0935 4 - 48   I 0.2720 5/16 - 24   61/64 ------------ 0.9531  
3/32 ------------------ 0.0938     J 0.2770     31/32 ------------ 0.9688  
41 0.0960     K 0.2810     63/64 ------------ 0.9844 1 1/8 - 7
40 0.0980     9/32 ------------- 0.2812     1 ----------------- 1.0000  
39 0.0995     L 0.2900     1 3/64----------- 1.0459 1 1/8 - 12
38 0.1015 5 - 40   M 0.2950     1 7/64----------- 1.1094 1 1/4 - 7
37 0.1040 5 - 44   19/64 ------------ 0.2969     1 1/8------------- 1.1250  
36 0.1065 6 - 32   N 0.3020     1 11/64 ---------- 1.1719 1 1/4 - 12
7/64 ------------------ 0.1094     5/16 ------------- 0.3125 3/8 - 16   1 7/32 ----------- 1.2186 1 3/8 - 6
35 0.1100     O 0.3160     1 1/4------------- 1.2500  
34 0.1110     P 0.3230     1 19/64---------- 1.2969 1 3/8 - 12
33 0.1130 6 - 40   21/64 ------------ 0.3281     1 11/32---------- 1.3433 1 1/2 - 6
32 0.1160     Q 0.3320 3/8 - 24   1 3/8------------- 1.3750  
31 0.1200     R 0.3390     1 27/64---------- 1.4219 1 1/2 - 12
1/8 ------------------- 0.1250     11/32 ------------ 0.3438     1 1/2------------- 1.5000  
30 0.1285     S 0.3480          
29 0.1360 8-32, 36   T 0.3580          
28 0.1405     23/64 ------------ 0.3594          
                       
PIPE THREAD SIZES (NPSC)   METRIC TAP DRILL SIZES   METRIC TAP DRILL SIZES
THREAD DRILL THREAD DRILL   METRIC TAP TAP DRILL mm DECIMAL
EQUIVALENT		   METRIC TAP TAP DRILL mm DECIMAL
EQUIVALENT
1/8 - 27 11/32 1 1/2 - 11 1/2 1 3/4   M1.6 x 0.35 1.25 0.0492   M16 x 2 14.00 0.5512
1/4 - 18 7/16 2 - 11 1/2 2 7/32   M1.8 x 0.35 1.45 0.0571   M16 x 1.5 14.50 0.5709
3/8 - 18 37/64 2 1/2 - 8 2 21/32   M2 x 0.4 1.60 0.0630   M18 x 2.5 15.50 0.6102
1/2 - 14 23/32 3 - 8 3 1/4   M2.2 x 0.45 1.75 0.0689   M18 x 1.5 16.50 0.6496
3/4 - 14 59/64 3 1/2 - 8 3 3/4   M2.5 x 0.45 2.05 0.0807   M20 x 2.5 17.50 0.6890
1 - 11 1/2 1 5/32 4 - 8 4 1/4   M3 x 0.5 2.50 0.0984   M20 x 1.5 18.50 0.7283
1 1/4 - 11 1/2 1 1/2       M3.5 x 0.8 2.90 0.1142   M22 x 2.5 19.50 0.7677
          M4 x 0.7 3.30 0.1299   M22 x 1.5 20.50 0.8071
          M4.5 x 0.75 3.70 0.1457   M24 x 3 21.00 0.8268
          M5 x 0.8 4.20 0.1654   M24 x 2 22.00 0.8661
          M6 x 1 5.00 0.1958   M27 x 3 24.00 0.9449
          M7 x 1 6.00 0.2362   M27 x 2 25.00 0.9813
          M8 x 1.25 6.70 0.2638   M30 x 3.5 26.50 1.0433
          M8 x 1 7.00 0.2756   M30 x 2 28.00 1.1024
          M10 x 1.5 8.50 0.3350   M33 x 3.5 29.50 1.1614
          M10 x 1.25 8.70 0.3425   M33 x 2 31.00 1.2205
          M12 x 1.75 10.20 0.4016   M36 x 4 32.00 1.2598
          M12 x 1.25 10.80 0.4252   M36 x 3 33.00 1.2992
          M14 x 2 12.00 0.4724   M39 x 4 35.00 1.3780
          M14 x 1.5 12.50 0.4921   M39 x 3 36.00 1.4173
                       
About Us

Advanced Integrated Technologies is essentially a manufacturing service company with two major divisions. The resistance welding and reflow soldering tool division grew out of our early work building micro tools for Hughes Aircraft. About the time that Microsoft was turning computers into a household item, computer hardware manufacturers were looking for companies to build reflow tools used in the assembly of hard drives and other components.

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