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Standard
Tap & Drill Sizes
American Std. and Unified Form Threads
Tap Drill Size is approximately 75%
Thread
(Printer
Friendly Version)
or click here >>>
for HUGE
10 PAGE - Expanded
Tap & Drill Chart:
includes USS, SAE, METRIC,
PIPE SIZES
& PILOT DRILL RECOMMENDATIONS IN HARD & SOFT WOOD ALSO |
| Thread |
Drill |
|
Thread |
Drill |
|
Thread |
Drill |
| 0-80 |
3/64 |
|
1/4-20 |
7 |
|
1-12 |
59/64 |
|
1-64
|
53 |
|
1/4-28 |
3 |
|
1
1/8-7 |
63/64 |
|
1-72
|
53 |
|
5/16-18 |
F |
|
1
1/8-12 |
1-3/64 |
| 2-56 |
50* |
|
5/16-24 |
I |
|
1
1/4-7 |
1-7/64 |
| 2-64 |
50 |
|
3/8-16 |
5/16 |
|
1
1/4-12 |
1-11/64 |
| 3-48 |
47* |
|
3/8-24 |
Q |
|
1
3/8 -6 |
1-7/32 |
| 3-56. |
45* |
|
7/16-14 |
U |
|
1
3/8-12 |
1-19/64 |
| 4-40 |
43 |
|
7/16-20 |
25/64* |
|
1
1/2 -6 |
1-11/32 |
| 4-48 |
42 |
|
1/2-13 |
27/64 |
|
1
1/2-12 |
1-27/64 |
| 5-40 |
38* |
|
1/2-20 |
29/64 |
|
1
3/4 -5 |
1-9/16 |
| 5-44 |
37 |
|
9/16-12 |
31/64 |
|
2"
- 4 1/2 |
1-25/32 |
| 6-32 |
36 |
|
9/16-18 |
33/64 |
|
2
1/4-4 1/2 |
2-1/32 |
| 6-40 |
33 |
|
5/8-11 |
17/32 |
|
2
1/2 - 4 |
2-1/4 |
| 8-32 |
29 |
|
5/8-18 |
37/64 |
|
2
3/4 - 4 |
2-1/2 |
| 8-36 |
29 |
|
3/4-10 |
21/32 |
|
3"
- 4 |
2-3/4 |
| 10-24 |
25 |
|
3/4-16 |
11/16 |
|
3
1/4-4 |
3
" |
| 10-32 |
21 |
|
7/8-9 |
49/64 |
|
3
1/2-4 |
3-1/4 |
| 12-24 |
16* |
|
7/8-14 |
13/16 |
|
3
3/4-4 |
3-1/2 |
| 12-28 |
14* |
|
1"
-8 |
7/8 |
|
4"
- 4 |
3-3/4 |
| |
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1"
-14 |
15/16 |
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*SOME SOURCES SUGGEST THE NEXT SIZE SMALLER THAN THESE
SIZES.
USE THE 10pg.
Expanded
Tap & Drill Chart TO FIND OUT THE NEXT / ALTERNATE SIZE SMALLER. |
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