Drill and Tap Sizes

size dia                  
#80 0.0135  
#79 0.0145  
1/64" 0.0156  
#78 0.0160  
#77 0.0180  
#76 0.0200  
#75 0.0210  
#74 0.0225  
#73 0.0240  
#72 0.0250  
#71 0.0260  
#70 0.0280  
#69 0.0292  
#68 0.0310  
1/32" 0.0313  
#67 0.0320  
#66 0.0330  
#65 0.0350  
#64 0.0360  
#63 0.0370  
#62 0.0380  
#61 0.0390  
#60 0.0400 0-80  
#59 0.0410 0.060                
#58 0.0420 0.0465  
#57 0.0430 tap                
#56 0.0465 100% 1-64 1-72  
3/64" 0.0469 97% 0.073 0.073            
#55 0.0520 59% 0.0561 0.0580  
#54 0.0550   tap tap 2-56          
#53 0.0595 clear 80% 90% 0.086 2-64        
1/16" 0.0625 0.0025 62% 70% 0.0667 0.086        
#52 0.0635 0.0035 56% 63% tap 0.0691  
#51 0.0670 0.0070     98% tap 3-48      
#50 0.0700 0.0100     83% 95% 0.099  
#49 0.0730 0.0130 clear clear 67% 77% 0.0764 3-56    
#48 0.0760 0.0160 0.0030 0.0030 52% 59% tap 0.099  
5/64" 0.0781   0.0051 0.0051 41% 47% 93% 0.0797 4-40  
#47 0.0785 0.0055 0.0055   44% 91% tap 0.112  
#46 0.0810   0.0080 0.0080     80% 93% 0.0849 4-48
#45 0.0820 0.0090 0.0090     75% 88% tap 0.112
#44 0.0860   0.0130 0.0130 clear clear 58% 67% 96% 0.0894
#43 0.0890 5-40 0.0030 0.0030 44% 52% 85% tap
#42 0.0935 0.125     0.0075 0.0075     68% 82%
3/32" 0.0938 0.0979 5-44 0.0078 0.0078     67% 81%
#41 0.0960 tap 0.125   0.0100 0.0100     59% 71%
#40 0.0980 100% 0.1004 6-32 0.0120 0.0120 clear clear 52% 62%
#39 0.0995 94% tap 0.138   0.0135 0.0005 0.0005 46% 55%
#38 0.1015 87% 96% 0.1042 0.0155 0.0025 0.0025   47%
#37 0.1040 78% 85% tap 6-40   0.0050 0.0050    
#36 0.1065 68% 75% 93% 0.138 0.0075 0.0075    
7/64" 0.1094 58% 64% 85% 0.1109   0.0104 0.0104    
#35 0.1100 55% 61% 83% tap 0.0110 0.0110    
#34 0.1110 52% 57% 80% 100%     0.0120 clear clear
#33 0.1130 44% 49% 74% 92% 0.0140 0.0010 0.0010
#32 0.1160     65% 81% 8-32 8-36 0.0170 0.0040 0.0040
#31 0.1200     53% 67% 0.164 0.164 0.0080 0.0080
1/8" 0.1250 clear clear   48% 0.1302 0.1339   0.0130 0.0130
#30 0.1285 0.0035 0.0035     tap tap 0.0165 0.0165
#29 0.1360 0.0110 0.0110 clear clear 83% 93% 10-24    
#28 0.1405 0.0155 0.0155 0.0025 0.0025 69% 78% 0.190  
9/64" 0.1406 0.0156 0.0156 0.0026 0.0026 69% 78% 0.1449    
#27 0.1440 0.0190 0.0190 0.0060 0.0060 59% 67% tap  
#26 0.1470 0.0220 0.0220 0.0090 0.0090 50% 57% 95% 10-32  
#25 0.1495 0.0245 0.0245 0.0115 0.0115 43% 48% 90% 0.190  
#24 0.1520     0.0140 0.0140     84% 0.1562  
#23 0.1540 0.0160 0.0160     80% tap  
5/32" 0.1563     0.0183 0.0183     75% 100%  
#22 0.1570 0.0190 0.0190     73% 98%  
#21 0.1590 12-24   0.0210 0.0210     69% 92%  
#20 0.1610 0.216 0.0230 0.0230 clear clear 64% 86%  
#19 0.1660 0.1709       0.0020 0.0020 53% 71%  
#18 0.1695 tap 12-28 0.0055 0.0055 45% 61%  
11/64" 0.1719 98% 0.216     0.0079 0.0079 40% 54%  
#17 0.1730 95% 0.1773 0.0090 0.0090   50%  
#16 0.1770 86% tap     0.0130 0.0130      
#15 0.1800 80% 93% 14-20 0.0160 0.0160      
#14 0.1820 75% 88% 0.242     0.0180      
#13 0.1850 69% 80% 0.1879 0.0210      
3/16" 0.1875 63% 74% tap   1/4"-20 0.0235      
#12 0.1890 60% 70% 98% 14-24 0.250 0.0250 clear clear  
#11 0.1910 55% 65% 94% 0.242 0.1959 0.0270 0.0010 0.0010  
#10 0.1935 50% 58% 90% 0.1969 tap 0.0295 0.0035 0.0035  
#9 0.1960 44% 52% 85% tap 100% 0.0320 0.0060 0.0060  
#8 0.1990   44% 79% 95% 94% 0.0090 0.0090  
#7 0.2010     76% 91% 91%   0.0110 0.0110  
13/64" 0.2031     72% 86% 87% 1/4"-28 0.0131 0.0131  
#6 0.2040     70% 84% 85% 0.250 0.0140 0.0140  
#5 0.2055     67% 81% 82% 0.2113 0.0155 0.0155  
#4 0.2090     61% 73% 76% tap 0.0190 0.0190  
#3 0.2130 clear clear 54% 64% 68% 96% 0.0230 0.0230  
7/32" 0.2188 0.0028 0.0028 43% 52% 58% 81% 0.0288 0.0288  
#2 0.2210 0.0050 0.0050   47% 54% 75% 0.0310 0.0310  
#1 0.2280 0.0120 0.0120     41% 57%      
A 0.2340 0.0180 0.0180       41%  
15/64" 0.2344 0.0184 0.0184       40%      
B 0.2380 0.0220 0.0220          
C 0.2420 0.0260 0.0260 clear clear     5/16"-18    
D 0.2460 0.0300 0.0300 0.0040 0.0040     0.313  
E 0.2500 0.0340 0.0340 0.0080 0.0080     0.2524    
1/4" 0.2500 0.0340 0.0340 0.0080 0.0080 clear clear tap  
F 0.2570 0.0410 0.0410 0.0150 0.0150 0.0070 0.0070 92% 5/16"-24  
G 0.2610 0.0190 0.0190 0.0110 0.0110 86% 0.313  
17/64" 0.2656     0.0236 0.0236 0.0156 0.0156 78% 0.2674  
H 0.2660 0.0240 0.0240 0.0160 0.0160 77% tap  
I 0.2720     0.0300 0.0300 0.0220 0.0220 67% 90%  
J 0.2770 0.0350 0.0350 0.0270 0.0270 59% 79%  
K 0.2811       0.0391 0.0311 0.0311 52% 70%  
9/32" 0.2813 0.0393 0.0313 0.0313 52% 69%  
L 0.2900     3/8"-16 0.0480 0.0400 0.0400   50%  
M 0.2950 0.375 0.0450 0.0450      
19/64" 0.2969     0.3073   0.0469 0.0469      
N 0.3020 tap      
5/16" 0.3125     92% 3/8"-24     clear clear  
O 0.3160 87% 0.375 0.0035 0.0035  
P 0.3230     77% 0.3299     0.0105 0.0105  
21/64" 0.3281 69% tap 0.0156 0.0156  
Q 0.3320     64% 95%     0.0195 0.0195  
R 0.3390 53% 80% 0.0265 0.0265  
11/32" 0.3438     46% 69% 7/16"-14   0.0313 0.0313  
S 0.3480   60% 0.438 0.0355 0.0355  
T 0.3580         0.3602   0.0455 0.0455  
23/64" 0.3594     tap 7/16"-20 0.0469 0.0469  
U 0.3680         90% 0.438 0.0555 0.0555  
3/8" 0.3750 clear clear 81% 0.3834  
V 0.3770     0.0020 0.0020 78% tap      
W 0.3860 0.0110 0.0110 67% 95%  
25/64" 0.3906     0.0156 0.0156 61% 87%      
X 0.3970 0.0220 0.0220 52% 75% 1/2"-13  
Y 0.4040     0.0290 0.0290 43% 62% 0.500    
13/32" 0.4063 0.0313 0.0313 40% 58% 0.4167 1/2"-20  
Z 0.4130     0.0380 0.0380   45% tap 0.500  
27/64" 0.4219 9/16"-12 0.0469 0.0469     94% 0.4459  
7/16" 0.4375 0.563     0.0625 clear clear 75% tap  
29/64" 0.4531 0.4723 9/16"-18 0.0156 0.0156 56% 87%  
15/32" 0.4688 tap 0.563 5/8"-11   0.0313 0.0313   58%  
31/64" 0.4844 87% 0.5024 0.625 0.0469 0.0469      
1/2" 0.5000 69% tap 0.5266   0.0625 0.0625 clear clear  
33/64" 0.5156 52% 78% tap 5/8"-18 0.0781 0.0781 0.0156 0.0156  
17/32" 0.5313   52% 95% 0.625     0.0313 0.0313  
35/64" 0.5469     79% 0.5649 0.0469 0.0469  
9/16" 0.5625 clear clear 64% tap     0.0625 0.0625  
37/64" 0.5781 0.0156 0.0156 48% 78% 0.0781 0.0781  
19/32" 0.5938 0.0313 0.0313   52% 3/4"-10   0.0938 0.0938  
39/64" 0.6094 0.0469 0.0469     0.750  
5/8" 0.6250 0.0625 0.0625 clear clear 0.6417 3/4"-16      
41/64" 0.6406 0.0781 0.0781 0.0156 0.0156 tap 0.750  
21/32" 0.6563 0.0938 0.0938 0.0313 0.0313 87% 0.6823      
43/64" 0.6719 0.1094 0.1094 0.0469 0.0469 72% tap  
11/16" 0.6875     0.0625 0.0625 58% 92%      
45/64" 0.7031 0.0781 0.0781 43% 69% 7/8"-9  
23/32" 0.7188     0.0938 0.0938   46% 0.875    
47/64" 0.7344 0.1094 0.1094     0.7547  
3/4" 0.7500         clear clear tap 7/8"-14  
49/64" 0.7656 0.0156 0.0156 91% 0.875  
25/32" 0.7813         0.0313 0.0313 78% 0.7977  
51/64" 0.7969 0.0469 0.0469 65% tap  
13/16" 0.8125 1"-8       0.0625 0.0625 52% 81%  
53/64" 0.8281 1 0.0781 0.0781   61%  
27/32" 0.8438 0.8647       0.0938 0.0938   40%  
55/64" 0.8594 tap 1"-12 0.1094 0.1094      
7/8" 0.8750 92% 1     0.1250 0.1250 clear clear  
57/64" 0.8906 81% 0.9098 0.1406 0.1406 0.0156 0.0156  
29/32" 0.9063 69% tap         0.0313 0.0313  
59/64" 0.9219 58% 87% 0.0469 0.0469  
15/16" 0.9375 46% 69%         0.0625 0.0625  
61/64" 0.9531   52% 0.0781 0.0781  
31/32" 0.9688             0.0938 0.0938  
63/64" 0.9844     0.1094 0.1094  
1" 1.0000             0.1250 0.1250  
Bold tap sizes from Machinery's Handbook, 28th Ed, Tapping, tables 3 & 4, pp 1934-5
Bold clearance holes from Machinery's Handbook, 28th Ed, Tapping, table 4, p 1935