Tap & Drill Sizes
|
USA
Threads
|
|
|
Thread
Size |
Tap
Drill Size |
|
#0-80
|
3/64
|
|
#2-56
|
#50
|
|
#2-64
|
#50
|
|
#4-40
|
#43
|
|
#4-48
|
#42
|
|
#5-40
|
#38
|
|
#5-44
|
#37
|
|
#6-32
|
#36
|
|
#6-40
|
#33
|
|
#8-32
|
#29
|
|
#8-36
|
#29
|
|
#10-24
|
#25
|
|
#10-32
|
#21
|
|
1/4-20
|
#7
|
|
1/4-28
|
#3
|
|
5/16-18
|
F
|
|
5/16-24
|
I
|
|
3/8-16
|
5/16
|
|
3/8-24
|
Q
|
|
7/16-14
|
U
|
|
7/16-20
|
25/64
|
|
1/2-13
|
27/64
|
|
1/2-20
|
29/64
|
|
9/16-12
|
31/64
|
|
9/16-18
|
33/64
|
|
5/8-11
|
17/32
|
|
5/8-18
|
37/64
|
|
3/4-10
|
21/32
|
|
3/4-16
|
11/16
|
|
7/8-9
|
49/64
|
|
7/8-14
|
13/16
|
|
1-8
|
7/8
|
|
1-14
|
15/16
|
|
1 1/8-7
|
63/64
|
|
1 1/8-12
|
1 3/64
|
|
Metric
Threads
|
|
|
Thread
Size |
Tap
Drill Size |
|
M1.6x0.35
|
1.25 mm
or #55
|
|
M2x0.4
|
1.60mm or
#52
|
|
M2.5x0.45
|
2.05mm or
#46
|
|
M3x0.5
|
2.5mm or
#39
|
|
M3.5x0.6
|
2.90mm or
#32
|
|
M4x0.7
|
3.30mm or
#30
|
|
M5x0.8
|
4.20mm or
#19
|
|
M6x1
|
5.00mm or
#8
|
|
M8x1.25
|
6.80mm or
H
|
|
M8x1
|
7.00mm or
J
|
|
M10x1.5
|
8.50mm or
R
|
|
M10x1.25
|
8.80mm or
11/32
|
|
M12x1.75
|
10.20mm
or 13/32
|
|
M12x1.25
|
10.80mm
or 27/64
|
|
M14x2
|
12.00mm
or 15/32
|
|
M14x1.5
|
12.50mm
or 1/2
|
|
M16x2
|
14.00mm
or 35/64
|
|
M16x1.5
|
14.50mm
or 37/64
|
|
M18x2.5
|
15.50mm
or 39/64
|
|
M18x1.5
|
16.50mm
or 21/32
|
|
M20x2.5
|
17.50mm
or 11/16
|
|
M20x1.5
|
18.50mm
or 47/64
|
|
M22x2.5
|
19.50mm
or 49/64
|
|
M22x1.5
|
20.50mm
or 13/16
|
|
M24x3
|
21.00mm
or 53/64
|
|
M24x2
|
22.00mm
or 7/8
|
|
M27x3
|
24.00mm
or 15/16
|
|
M27x2
|
25.00mm
or 1
|
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