Tap Drill Sizes
dec-eq
Tap
NC
Drill
Inch
Drill
Metric
1-64
#53
1.55
2-56
#50
1.85
3-48
#47
2.10
4-40
#43
2.35
5-40
#38
2.65
6-32
#36
2.85
8-32
#29
3.50
10-24
#25
3.90
12-24
#16
4.50
1/4-20
#7
5.10
5/16-18
"F"
6.60
3/8-16
5/16
8.00
7/16-14
"U"
9.40
1/2-13
27/64
10.80
9/16-12
31/64
12.20
5/8-11
17/32
13.50
3/4-10
21/32
16.50
7/8-9
49/64
19.50
1"-8
7/8
22.25
1-1/8 7
63/64
25.00
1-1/4 7
1-7/64
28.00
1-3/8 6
1-7/32
30.75
1-1/2 6
1-11/32
34.00
1-3/4 5
1-9/16
39.50
2" 4-1/2
1-25/32
45.00
Tap
NF
Drill
Inch
Drill
Metric
0-80
3/64
1.25
1-72
#53
1.55
2-64
#50
1.90
3-56
#45
2.15
4-48
#42
2.40
5-44
#37
2.70
6-40
#33
2.95
8-36
#29
3.50
10-32
#21
4.10
12-28
#14
4.70
1/4-28
#3
5.50
5/16-24
"I"
6.90
3/8-24
"Q"
8.50
7/16-20
25/64
9.90
1/2-20
29/64
11.50
9/16-18
33/64
12.90
5/8-18
37/64
14.50
3/4-16
11/16
17.50
7/8-14
13/16
20.40
1"-12
59/64
23.25
1"-14NS
15/16
23.50
1-1/8 12
1-3/64
26.50
1-1/4 12
1-11/64
29.50
1-3/8 12
1-19/64
32.75
1-1/2 12
1-27/64
36.00

Tap
MM
Drill
Inch
Drill
Metric
M1.0 X 0.25
#68
0.75
M1.1 X 0.25
#65
0.85
M1.2 X 0.25
#62
0.95
M1.4 X 0.30
#57
1.10
M1.6 X 0.35
3/64
1.25
M1.8 X 0.35
#53
1.45
M2.0 X 0.40
1/16
1.60
M2.2 X 0.45
#50
1.75
M2.5 X 0.45
#46
2.05
M3.0 X 0.50
#40
2.50
M3.5 X 0.60
#32
2.90
M4.0 X 0.70
#30
3.30
M4.5 X 0.75
#26
3.70
M5.0 X 0.80
#19
4.20
M6.0 X 1.00
#9
5.00
M7.0 X 1.00
15/64
6.00
M8.0 X 1.25
17/64
6.80
M9.0 X 1.25
5/16
7.80
M10 X 1.50
"Q"
8.50
M11 X 1.50
"V"
9.50
M12 X 1.75
"Y"
10.20
M14 X 2.00
15/32
12.00
M16 X 2.00
35/64
14.00
M18 X 2.50
39/64
15.50
M20 X 2.50
11/16
17.50
M22 X 2.50
49/64
19.50
M24 X 3.00
53/64
21.00
M27 X 3.00
61/64
24.00
M30 X 3.50
1-3/64
26.50
M33 X 3.50
1-11/64
29.50
M36 X 4.00
1-1/4
32.00
M39 X 4.00
1-3/8
35.00
M42 X 4.50
1-31/64
37.50
M45 X 4.50
1-19/32
40.50
M48 X 5.00
1-45/64
43.00
M52 X 5.00
1-55/64
47.00
M56 X 5.50
1-63/64
50.50
Tap
MF/MS
Drill
Inch
Drill
Metric
MF3.0 X 0.35
#37
2.65
MF3.5 X 0.35
1/8
3.15
MF4.0 X 0.50
#28
3.50
MF4.5 X 0.50
#21
4.00
MF5.0 X 0.50
#16
4.50
MF6.0 X 0.75
#5
5.20
MF7.0 X 0.75
"D"
6.20
MF8.0 X 1.00
"J"
7.00
MS8.0 X 0.75
"L"
7.20
MS9.0 X 1.00
"O"
8.00
MF10 X 1.25
11/32
8.80
MS10 X 1.00
"T"
9.00
MS10 X 0.75
"U"
9.20
MS11 X 0.75
"Y"
10.20
MS12 X 1.50
"Z"
10.50
MF12 X 1.25
27/64
10.80
MS12 X 1.00
7/16
11.00
MF14 X 1.50
31/64
12.50
MS14 X 1.25
33/64
12.80
MF16 X 1.50
9/16
14.50
MS16 X 1.00
19/32
15.00
MF18 X 1.50
41/64
16.50
MS18 X 1.00
43/64
17.00
MF20 X 1.50
23/32
18.50
MS20 X 1.00
3/4
19.00
MF22 X 1.50
13/16
20.50
MF24 X 2.00
55/64
22.00
MS24 X 1.50
57/64
22.50
MS25 X 1.50
59/64
23.50
MF27 X 2.00
63/64
25.00
MF30 X 2.00
1-7/64
28.00
MS32 X 1.50
1-13/64
30.50
MF33 X 2.00
1-7/32
31.00
MF36 X 3.00
1-19/64
33.00
MF39 X 3.00
1-27/64
36.00

Tap
NPT
Drill
Inch
Drill
Metric
1/16-27
"D"
6.30
1/8-27
"Q"
8.50
1/4-18
7/16
11.10
3/8-18
9/16
14.70
1/2-14
45/64
18.25
3/4-14
29/32
23.40
1" 11-1/2
1-9/64
29.40
1-1/4 11-1/2
1-31/64
38.10
1-1/2 11-1/2
1-47/64
44.00
2" 11-1/2
2-13/64
56.30
Tap
NPS
Drill
Inch
Drill
Metric
1/16-27
1/4
6.80
1/8-27
11/32
9.10
1/4-18
7/16
11.90
3/8-18
37/64
15.25
1/2-14
23/32
19.00
3/4-14
59/64
23.75
1" 11-1/2
1-5/32
30.00
1-1/4 11-1/2
1-33/64
39.50
1-1/2 11-1/2
1-3/4
45.50
2" 11-1/2
2-7/32
62.00

Tap
BSW
Drill
MM
1/8-40
2.55
5/32-32
3.20
3/16-24
3.70
7/32-24
4.50
1/4-20
5.10
5/16-18
6.50
3/8-16
7.90
7/16-14
9.30
1/2-12
10.50
9/16-12
12.10
5/8-11
13.50
11/16-10
15.00
3/4-10
16.25
7/8-9
19.25
1"-8
22.00
1-1/8 7
24.75
1-1/4 7
28.00
1-1/2 6
33.50
1-3/4 5
39.00
2" 4-1/2
44.50
Tap
BSF
Drill
MM
3/16-32
4.00
7/32-28
4.60
1/4-26
5.30
9/32-26
6.10
5/16-22
6.80
3/8-20
8.30
7/16-18
9.70
1/2-16
11.10
9/16-16
12.70
5/8-14
14.00
11/16-14
15.50
3/4-12
16.75
7/8-11
19.75
1"-10
22.75
1-1/8 9
25.50
1-1/4 9
28.50
1-3/8 8
31.50
1-1/2 8
34.50
1-3/4 7
40.50
2"-7
47.00
Tap
BSPT
Drill
Inch
1/8-28
8.40
1/4-19
11.20
3/8-19
14.75
1/2-14
18.25
3/4-14
23.75
1"-11
30.00
1-1/4 11
38.50
1-1/2 11
44.50
2"-11
56.00
2-1/2 11
71.00

Tap
BSP
Drill
Inch
1/8-28
8.60
1/4-19
11.50
3/8-19
15.00
1/2-14
18.75
5/8-14
20.75
3/4-14
24.25
7/8-14
28.00
1"-11
30.40
1-1/2 11
45.00
2"-11
56.75