SAE Tap Drill Table
Machine Screw Size Number of Threads Per Inch Minor Dia Tap Drills Clearance Hole Drills
Aluminum, Brass & Plastics
75% Thread 		Stainless Steel,
Steels & Iron
50% Thread 		All Materials
Close Fit Free Fit
Nbr or Dia Major Dia Drill Size Decimal
Equivalent 		Drill Size Decimal
Equivalent 		Drill Size Decimal Equivalent Drill Size Decimal
Equivalent
0 .0600 80 .0447 3/64 .0469 55 .0520 52 .0635 50 .0700
1 .0730 64
72 		.0538
.0560 		53
53 		.0595
.0595 		1/16
52 		.0625
.0635 		48 .0760 46 .0810
2 .0860 56
64 		.0641
.0668 		50
50 		.0700
.0700 		49
48 		.0730
.0760 		43 .0890 41 .0960
3 .0990 48
56 		.0734
.0771 		47
45 		.0785
.0820 		44
43 		.0860
.0890 		37 .1040 35 .1100
4 .1120 40
48 		.0813
.0864 		43
42 		.0890
.0935 		41
40 		.0960
.0980 		32 .1160 30 .1285
5 .1250 40
44 		.0943
.0971 		38
37 		.1015
.1040 		7/64
35 		.1094
.1100 		30 .1285 29 .1360
6 .1380 32
40 		.0997
.1073 		36
33 		.1065
.1130 		32
31 		.1160
.1200 		27 .1440 25 .1495
8 .1640 32
36 		.1257
.1299 		29
29 		.1360
.1360 		27
26 		.1440
.1470 		18 .1695 16 .1770
10 .1900 24
32 		.1389
.1517 		25
21 		.1495
.1590 		20
18 		.1610
.1695 		9 .1960 7 .2010
12 .2160 24
28
32 		.1649
.1722
.1777 		16
14
13 		.1770
.1820
.1850 		12
10
9 		.1890
.1935
.1960 		2 .2210 1 .2280
1/4 .2500 20
28
32 		.1887
.2062
.2117 		7
3
7/32 		.2010
.2130
.2188 		7/32
1
1 		.2188
.2280
.2280 		F .2570 H .2660
5/16 .3125 18
24
32 		.2443
.2614
.2742 		F
I
9/32 		.2570
.2720
.2812 		J
9/32
L 		.2770
.2812
.2900 		P .3230 Q .3320
3/8 .3750 16
24
32 		.2983
.3239
.3367 		5/16
Q
11/32 		.3125
.3320
.3438 		Q
S
T 		.3320
.3480
.3580 		W .3860 X .3970
7/16 .4375 14
20
28 		.3499
.3762
.3937 		U
25/64
Y 		.3680
.3906
.4040 		25/64
13/32
Z 		.3906
.4062
.4130 		29/64 .4531 15/32 .4687
1/2 .5000 13
20
28 		.4056
.4387
.4562 		27/64
29/64
15/32 		.4219
.4531
.4688 		29/64
15/32
15/32 		.4531
.4688
.4688 		33/64 .5156 17/32 .5312
 
Machine Screw Size Number of Threads Per Inch Minor Dia Tap Drills Clearance Hole Drills
Aluminum, Brass & Plastics
75% Thread 		Stainless Steel,
Steels & Iron
50% Thread 		All Materials
Close Fit Free Fit
Nbr or Dia Major Dia Drill Size Decimal
Equivalent 		Drill Size Decimal
Equivalent 		Drill Size Decimal Equivalent Drill Size Decimal
Equivalent
9/16 .5625 12
18
24 		.4603
.4943
.5114 		31/64
33/64
33/64 		.4844
.5156
.5156 		33/64
17/32
17/32 		.5156
.5312
.5312 		37/64 .5781 19/32 .5938
5/8 .6250 11
18
24 		.5135
.5568
.5739 		17/32
37/64
37/64 		.5312
.5781
.5781 		9/16
19/32
19/32 		.5625
.5938
.5938 		41/64 .6406 21/32 .6562
11/16 .6875 24 .6364 41/64 .6406 21/32 .6562 45/64 .7031 23/32 .6562
3/4 .7500 10
16
20 		.6273
.6733
.6887 		21/32
11/16
45/64 		.6562
.6875
.7031 		11/16
45/64
23/32 		.6875
.7031
.7188 		49/64 .7656 25/32 .7812
13/16 .8125 20 .7512 49/64 .7656 25/32 .7812 53/64 .8281 27/32 .8438
7/8 .8750 9
14
20 		.7387
.7874
.8137 		49/64
13/16
53/64 		.7656
.8125
.8281 		51/64
53/64
27/32 		.7969
.8281
.8438 		57/64 .8906 29/32 .9062
15/16 .9375 20 .8762 57/64 .8906 29/32 .9062 61/64 .9531 31/32 .9688
1 1.000 8
12
20 		.8466
.8978
.9387 		7/8
15/16
61/64 		.8750
.9375
.9531 		59/64
61/64
31/32 		.9219
.9531
.9688 		1-1/64 1.0156 1-1/32 1.0313
1-1/16 1.0625 18 .9943 1.000 1.000 1-1/64 1.0156 1-5/64 1.0781 1-3/32 1.0938
1-1/8 1.1250 7
12
18 		.9497
1.0228
1.0568 		63/64
1-3/64
1-1/16 		.9844
1.0469
1.0625 		1-1/32
1-5/64
1-5/64 		1.0313
1.0781
1.0781 		1-9/64 1.1406 1-5/32 1.1562
1-3/16 1.1875 18 1.1193 1-1/8 1.1250 1-9/64 1.1406 1-13/64 1.2031 1-7/32 1.2188
1-1/4 1.2500 7
12
18 		1.0747
1.1478
1.1818 		1-7/64
1-11/64
1-3/16 		1.1094
1.1719
1.1875 		1-5/32
1-13/64
1-13/64 		1.1562
1.2031
1.2031 		1-17/64 1.2656 1-9/32 1.2812
1-5/16 1.3125 18 1.2443 1-1/4 1.2500 1-17/64 1.2656 1-21/64 1.3281 1-11/32 1.3438
1-3/8 1.3750 6
12
18 		1.1705
1.2728
1.3068 		1-7/32
1-19/64
1-5/16 		1.2187
1.2969
1.3125 		1-17/64
1-21/64
1-21/64 		1.2656
1.3281
1.3281 		1-25/64 1.3906 1-13/32 1.4062
1-7/16 1.4375 18 1.3693 1-3/8 1.3750 1-25/64 1.3906 1-29/64 1.4531 1-15/32 1.4688
1-1/2 1.500 6
12
18 		1.2955
1.3978
1.4318 		1-11/32
1-27/64
1-7/16 		1.3437
1.4219
1.4375 		1-25/64
1-7/16
1-29/64 		1.3906
1.4375
1.4531 		1-33/64 1.5156 1-17/32 1.5312
1-9/16 1.5625 18 1.4943 1-1/2 1.500 1-33/64 1.5156 1-37/64 1.5781 1-19/32 1.5938
1-5/8 1.625 18 1.5568 1-9/16 1.5625 1-37/64 1.5781 1-41/64 1.6406 1-21/32 1.6562
1-11/16 1.6875 18 1.6193 1-5/8 1.6250 1-41/64 1.6406 1-45/64 1.7031 1-23/32 1.7188
1-3/4 1.750 5 1.5046 1-9/16 1.5625 1-5/8 1.6250 1-49/64 1.7659 1-25/32 1.7812