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Advantage Machine and Tool
923 2nd Avenue North
Billings MT 59101
Phone: (406) 896-0066
Toll-Free 877-852-0066
Fax: (406) 896-0077
Email
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TAP DRILL CHART
Tap
Drill Sizes (inch) for a 75% Thread
In
general, you can find the tap-drill for any size 60 degree thread, subtract one
pitch length from the major diameter.
Formula: Major Dia. minus One Pitch Length equals tap-drill size
English
Example: 3/8-16 thread: .375 - .0625 = .3125
tap-drill (5/16)
Metric Example: M6 X 1 thread: 6mm - 1mm
= 5mm tap-drill
| Tap Size
|
Thread Form
|
Tap Drill
|
|
Tap Size
|
Thread Form
|
Tap Drill
|
| 0-80
|
UNF
|
3/64
|
|
1/4-20 |
UNC |
7 |
| 1-64
|
UNC
|
53
|
|
1/4-28 |
UNF |
3 |
| 1-72
|
UNF
|
53
|
|
5/16-18 |
UNC |
F |
| 2-56
|
UNC
|
50
|
|
5/16-24 |
UNF |
I |
| 2-64
|
UNF
|
50
|
|
3/8-16 |
UNC |
5/16 |
| 3-48
|
UNC
|
47
|
|
3/8-24 |
UNF |
Q |
| 3-56
|
UNF
|
45
|
|
7/16-14 |
UNC |
U |
| 4-40
|
UNC
|
43
|
|
7/16-20 |
UNF |
25/64 |
| 4-48
|
UNF
|
42
|
|
1/2-13 |
UNC |
27/64 |
| 5-40
|
UNC
|
38
|
|
1/2-20 |
UNF |
29/64 |
| 5-44
|
UNF
|
37
|
|
9/16-12 |
UNC |
31/64 |
| 6-32 |
UNC |
36 |
|
9/16-18 |
UNF |
33/64 |
| 6-40 |
UNF |
33 |
|
5/8-11 |
UNC |
17/32 |
| 8-32 |
UNC |
29 |
|
5/8-18 |
UNF |
37/64 |
| 8-36 |
UNF |
29 |
|
11/16-11 |
UNS |
19/32 |
| 10-24 |
UNC |
25 |
|
11/16-16 |
UNS |
5/8 |
| 10-32 |
UNF |
21 |
|
3/4-10 |
UNC |
21/32 |
| 12-24 |
UNC |
16 |
|
3/4-16 |
UNF |
11/16 |
| 12-28 |
UNF |
14 |
|
7/8-9 |
UNC |
49/64 |
| 14-20 |
UNS |
10 |
|
7/8-14 |
UNF |
13/16 |
| 14-24 |
UNS |
7 |
|
1-8 |
UNC |
7/8 |
| |
|
|
|
1-12 |
UNF |
59/64 |
| |
|
|
|
1-14 |
UNS |
15/16 |
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