Tap Drill Size Chart

Bolt Size Drill Size Closest Fractional Decimal (in) Decimal (mm)
9mm-1.25mm 7.9mm 0.311 7.899
9mm-1.00mm 8.1mm 0.319 8.1
9mm-0.75mm 8.3mm 0.327 8.301
9/16-18 NF 33/64″ 33/64″ 0.516 13.096
9/16-12 NC 31/64″ 31/64″ 0.484 12.304
8mm-1.25mm 6.9mm 17/64″ 0.272 6.899
8mm-1.00mm 7.1mm 0.28 7.099
8-40 NS #28 0.141 3.569
8-36 NF #29 9/64″ 0.136 3.454
8-32 NC #29 0.136 3.454
7mm-1.00mm 6.1mm 15/64″ 0.24 6.099
7/8-9 NC 49/64″ 49/64″ 0.766 19.446
7/8-18 NS* 53/64″ 53/64″ 0.828 21.034
7/8-14 NF 13/16″ 13/16″ 0.813 20.638
7/16-20 NF 25/64″ 25/64″ 0.391 9.921
7/16-14 NC Ltr.U 23/64″ 0.368 9.347
6mm-1.00mm 5.2mm 0.205 5.199
6-48 NS #31 0.12 3.048
6-40 NF #33 0.113 2.87
6-36 NS #34 0.111 2.819
6-32 NC #35 7/64″ 0.11 2.794
5mm-0.90mm 4.2mm 0.165 4.199
5mm-0.80mm 4.3mm 0.169 4.3
5/8-18 NF 37/64″ 37/64″ 0.578 14.684
5/8-11 NC 17/32″ 17/32″ 0.531 13.492
5/16-32 NEF 9/32″ 9/32″ 0.281 7.142
5/16-24 NF Ltr.I 0.272 6.909
5/16-18 NC Ltr.F 17/64″ 0.257 6.528
5-44 NF #37 0.104 2.642
5-40 NC #38 0.102 2.578
4mm-0.75mm 3.4mm 0.134 3.399
4mm-0.70mm 3.4mm 0.134 3.399
4-48 NF #42 3/32″ 0.094 2.375
4-40 NC #43 3/32″ 0.089 2.261
4-36 NS #44 0.086 2.184
3mm-0.60mm 2.5mm 0.098 2.499
3/8-24 NF Ltr.Q 21/64″ 0.332 8.433
3/8-16 NC 5/16″ 5/16″ 0.313 7.938
3/4-16 NF 11/16″ 11/16″ 0.688 17.463
3/4-10 NC 21/32″ 21/32″ 0.656 16.667
3/16-32 NS #22 0.157 3.988
3/16-24 NS #26 0.147 3.734
3-56 NF #45 0.082 2.083
3-48 NC #47 5/64″ 0.079 1.994
24mm-3.00mm 21.4mm 53/64″ 0.843 21.4
24mm-2.00mm 22.3mm 0.878 22.299
22mm-1.50mm 20.9mm 0.823 20.899
20mm-2.50mm 17.8mm 11/16″ 0.701 17.8
2-64 NF #50 0.07 1.778
2-56 NC #50 0.07 1.778
18mm-2.50mm 15.8mm 39/64″ 0.622 15.799
18mm-1.50mm* 16.8mm 0.661 16.8
16mm-2.00mm 14.2mm 35/64″ 0.559 14.199
16mm-1.50mm 14.7mm 0.579 14.699
14mm-2.00mm 12.2mm 0.48 12.2
14mm-1.50mm 12.7mm 0.5 12.697
14mm-1.25mm* 12.8mm 0.504 12.799
14-24 NS #7 0.201 5.105
14-20 NS #10 0.194 4.915
12mm-1.75mm 10.5mm 0.413 10.498
12mm-1.50mm 10.7mm 27/64″ 0.421 10.698
12mm-1.25mm* 10.9mm 27/64″ 0.429 10.899
12-32 NEF #13 0.185 4.699
12-28 NF #14 3/16″ 0.182 4.623
12-24 NC #16 11/64″ 0.177 4.496
11mm-1.50mm 9.7mm 0.382 9.698
11/16-16 NS 5/8″ 5/8″ 0.625 15.875
11/16-11 NS 19/32″ 19/32″ 0.594 15.083
10mm-1.50mm 8.7mm 0.343 8.7
10mm-1.25mm 8.9mm 11/32″ 0.35 8.898
10mm-1.00mm* 9.1mm 0.358 9.101
10-32 NF #21 5/32″ 0.159 4.039
10-24 NC #25 5/32″ 0.15 3.797
1/8-40 NS #38 0.102 2.578
1/4-40 NS #1 0.228 5.791
1/4-32 NEF 7/32″ 7/32″ 0.219 5.558
1/4-28 NF #3 7/32″ 0.213 5.41
1/4-24 NS #4 0.209 5.309
1/4-20 NC #7 13/64″ 0.201 5.105
1/2-24 NS 29/64″ 29/64″ 0.453 11.509
1/2-20 NF 29/64″ 29/64″ 0.453 11.509
1/2-13 NC 27/64″ 27/64″ 0.422 10.716
1.8 NC 7/8″ 7/8″ 0.875 22.225
1.12 NF 59/64″ 59/64″ 0.922 23.416
1-72 NF #53 1/16″ 0.06 1.511
1-64 NC #53 0.06 1.511
1-14 NS 15/16″ 15/16″ 0.938 23.813
1 3/8-6 NC 1 7/32″ 1 7/32″ 1.219 30.958
1 3/8-12 NF 1 19/64″ 1 19/64″ 1.297 32.941
1 1/8-7 NC 63/64″ 63/64″ 0.984 25.004
1 1/8-12 NF 1 3/64″ 1 3/64″ 1.047 26.591
1 1/4-7 NC 1 7/64″ 1 7/64″ 1.109 28.179
1 1/4-12 NF 1 11/64″ 1 11/64″ 1.172 29.766
1 1/2″-12 NF 1 27/64″ 1 27/64″ 1.422 36.116
1 1/2-6 NC 1 11/32″ 1 11/32″ 1.344 34.133
0-80 NF 3/64″ 3/64″ 0.047 1.191

People Also Ask About the Tap Drill Size Chart

What size drill do I need for a tap?

What size drill do I need for a tap

To determine the size of the drill bit you need for tapping, you typically refer to a tap and drill chart or consult the manufacturer’s recommendations. The drill size depends on the specific thread size and type of tap you are using.

What size drill bit for a 7/8 tap?

What size drill bit for a 78 tap

To tap a hole for a 7/8-inch thread, you would typically use a drill bit that is slightly smaller in diameter than 7/8 inch. The exact size would depend on the type of tap (e.g., standard or metric) and the thread pitch.

What is the size of drill tap 8-32?

What is the size of drill tap 8-32

An 8-32 tap typically requires a drill bit sized #29 for a through-hole or #36 for a blind hole in standard fractional sizes. The specific size may vary depending on your application and the type of tap.

How big is a 10-32 hole?

How big is a 10-32 hole

A 10-32 threaded hole is designed for a screw or bolt with a 10-32 UNF (Unified National Fine) thread. The hole size for this thread is typically around 0.1900 inches in diameter.

What is a tap drill chart?

What is a tap drill chart

A tap drill chart is a reference tool that provides information on the recommended drill bit sizes for various tap sizes and thread types. It helps you determine the correct drill size to use when preparing a hole for tapping.

What size hole do I drill for a 1/2 tap?

What size hole do I drill for a 12 tap

To tap a hole for a 1/2-inch thread, you would typically use a drill bit that is slightly smaller in diameter than 1/2 inch. The exact size would depend on the type of tap and thread pitch you are using.

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