Tap And Drill Chart Page 2
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1
2
3Tap and Drill Chart
(Recommended tap drill to use for 75% depth of thread)
800-871-5022
To Tap this Size Screw
Use This
(Closest
Decimal
More information can be found at
Or Bolt:
Drill Bit:
Fractional:)
Inches
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
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
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