To Tap This Size Screw Or Bolt: |
Use This Drill Bit: |
(Closest Fractional:) |
Decimal Inches |
0-80 NF |
3/64" |
3/64" |
.0469 |
1-64 NC |
#53 |
- |
.0595 |
1-72 NF |
#53 |
1/16" |
.0595 |
2-56 NC |
#50 |
- |
.0700 |
2-64 NF |
#50 |
- |
.0700 |
3-48 NC |
#47 |
5/64" |
.0785 |
3-56 NF |
#45 |
- |
.0820 |
4-36 NS |
#44 |
- |
.0860 |
4-40 NC |
#43 |
3/32" |
.0890 |
4-48 NF |
#42 |
3/32" |
.0935 |
3mm-.060mm |
2.5mm |
- |
.0984 |
1/8-40 NS |
#38 |
- |
.1015 |
5-40 NC |
#38 |
- |
.1015 |
5-44 NF |
#37 |
- |
.1040 |
6-32 NC |
#35 |
7/64" |
.1100 |
6-36 NS |
#34 |
- |
.1110 |
6-40 NF |
#33 |
- |
.1130 |
6-48 NS |
#31 |
- |
.1200 |
4mm-0.70mm |
3.4mm |
- |
.1338 |
4mm-.075mm |
3.4mm |
- |
.1338 |
8-32 NC |
#29 |
- |
.1360 |
8-36 NF |
#29 |
9/64" |
.1360 |
8-40 NS |
#28 |
- |
.1405 |
3/16-24 NS |
#26 |
- |
.1470 |
10-24 NC |
#25 |
5/32" |
.1495 |
3/16-32 NS |
#22 |
- |
.1570 |
10-32 NF |
#21 |
5/32" |
.1590 |
5mm-.090mm |
4.2mm |
- |
.1653 |
5mm-.080mm |
4.3mm |
- |
.1693 |
12-24 NC |
#16 |
11/64" |
.1770 |
12-28 NF |
#14 |
3/16" |
.1820 |
12-32 NEF |
#13 |
- |
.1850 |
14-20 NS |
#10 |
- |
.1935 |
1/4-20 NC |
#7 |
13/64" |
.2010 |
14-24 NS |
#7 |
- |
.2010 |
6mm-1.00mm |
5.2mm |
- |
.2047 |
1/4-24 NS |
#4 |
- |
.2090 |
1/4-28 NF |
#3 |
7/32" |
.2130 |
1/4-32 NEF |
7/32" |
7/32" |
.2188 |
1/4-40 NS |
#1 |
- |
.2280 |
7mm-1.00mm |
6.1mm |
15/64" |
.2401 |
5/16-18 NC |
Ltr.F |
17/64" |
.2570 |
8mm-1.25mm |
6.9mm |
17/64" |
.2716 |
5/16-24 NF |
Ltr.I |
- |
.2720 |
8mm-1.00mm |
7.1mm |
- |
.2795 |
5/16-32 NEF |
9/32" |
9/32" |
.2812 |
9mm-1.25mm |
7.9mm |
- |
.3110 |
3/8-16 NC |
5/16" |
5/16" |
.3125 |
|
|
To Tap This Size Screw Or Bolt: |
Use This Drill Bit: |
(Closest Fractional:) |
Decimal Inches |
9mm-1.00mm |
8.1mm |
- |
.3189 |
9mm-0.75mm |
8.3mm |
- |
.3268 |
3/8-24 NF |
Ltr.Q |
21/64" |
.3320 |
10mm-1.50mm |
8.7mm |
- |
.3425 |
10mm-1.25mm |
8.9mm |
11/32" |
.3503 |
10mm-1.00mm* |
9.1mm |
- |
.3583 |
7/16-14 NC |
Ltr.U |
23/64" |
.3680 |
11mm-1.50mm |
9.7mm |
- |
.3818 |
7/16-20 NF |
25/64" |
25/64" |
.3906 |
12mm-1.75mm |
10.5mm |
- |
.4133 |
12mm-1.50mm |
10.7mm |
27/64" |
.4212 |
1/2-13 NC |
27/64" |
27/64" |
.4219 |
12mm-1.25mm* |
10.9mm |
27/64" |
.4291 |
1/2-20 NF |
29/64" |
29/64" |
.4531 |
1/2-24 NS |
29/64" |
29/64" |
.4531 |
14mm-2.00mm |
12.2mm |
- |
.4803 |
9/16-12 NC |
31/64" |
31/64" |
.4844 |
14mm-1.50mm |
12.7mm |
- |
.4999 |
14mm-1.25mm* |
12.8mm |
- |
.5039 |
9/16-18 NF |
33/64" |
33/64" |
.5156 |
5/8-11 NC |
17/32" |
17/32" |
.5312 |
16mm-2.00mm |
14.2mm |
35/64" |
.5590 |
5/8-18 NF |
37/64" |
37/64" |
.5781 |
16mm-1.50mm |
14.7mm |
- |
.5787 |
11/16-11 NS |
19/32" |
19/32" |
.5938 |
18mm-2.50mm |
15.8mm |
39/64" |
.5220 |
11/16-16 NS |
5/8" |
5/8" |
.6250 |
3/4-10 NC |
21/32" |
21/32" |
.6562 |
18mm-1.50mm* |
16.8mm |
- |
.6614 |
3/4-16 NF |
11/16" |
11/16" |
.6875 |
20mm-2.50mm |
17.8mm |
11/16" |
.7008 |
7/8-9 NC |
49/64" |
49/64" |
.7656 |
7/8-14 NF |
13/16" |
13/16" |
.8125 |
22mm-1.50mm |
20.9mm |
- |
.8228 |
7/8-18 NS* |
53/64" |
53/64" |
.8281 |
24mm-3.00mm |
21.4mm |
53/64" |
.8425 |
1.8 NC |
7/8" |
7/8" |
.8750 |
24mm-2.00mm |
22.3mm |
- |
.8779 |
1.12 NF |
59/64" |
59/64" |
.9219 |
1-14 NS |
15/16" |
15/16" |
.9375 |
1 1/8-7 NC |
63/64" |
63/64" |
.9844 |
1 1/8-12 NF |
1 3/64" |
1 3/64" |
1.0469 |
1 1/4-7 NC |
1 7/64" |
1 7/64" |
1.1094 |
1 1/4-12 NF |
1 11/64" |
1 11/64" |
1.1719 |
1 3/8-6 NC |
1 7/32" |
1 7/32" |
1.2188 |
1 3/8-12 NF |
1 19/64" |
1 19/64" |
1.2969 |
1 1/2-6 NC |
1 11/32" |
1 11/32" |
1.3438 |
1 1/2"-12 NF |
1 27/64" |
1 27/64" |
1.4219 |
|