Drill Bit Sizes

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Engineering Slide Chart ANSI Drill Sizes & Hardware Selector

Machinist Drill Bit Size Table | Drill Bit Size Chart | ISO Metric Drill Bit Size Table

For typical mechanical tolerances that are achievable see: Drilling Tolerances Capabilities Chart

ANSI Size Drill Bit Chart

ISO (Metric Size Drills) & Conversion to Inches

Drill
(in.)

Decimal

Drill
(in.)

Decimal

Drill
(in.)

Decimal

Drill
(mm)

Decimal
(in.)

Drill
(mm)

Decimal
(in.)

Drill
(mm)

Decimal
(in.)

.0135

1/8

.1250

.3160

.35

.0138

3.4

.1339

8.0

.3150

.0145

.1285

.3230

.0157

3.5

.1378

8.1

.3189

1/64

.0156

.1360

21/64

.3281

.45

.0177

3.6

.1417

8.2

.3228

.0160

.1405

.3320

.0197

3.7

.1457

8.25

.3248

.0180

9/64

.1406

.3390

.55

.0217

3.75

.1477

8.3

.3267

.0200

.1440

11/32

.3437

.0236

3.8

.1496

8.4

.3307

.0210

.1470

.3480

.65

.0256

3.9

.1535

8.5

.3346

.0225

.1495

.3580

.0276

4.0

.1575

8.6

.3386

.0240

.1520

23/64

.3594

.75

.0295

4.1

.1614

8.7

.3425

.0250

.1540

.3680

.0315

4.2

.1654

8.75

.3445

.0260

5/32

.1562

3/8

.3750

.85

.0335

4.25

.1674

8.8

.3465

.0280

.1570

.3770

.0355

4.3

.1693

8.9

.3504

.0292

.1590

.3860

.95

.0374

4.4

.1732

9.0

.3543

.0310

.1610

25/64

.3906

1.0

.0394

4.5

.1771

9.1

.3583

1/32

.0313

.1660

.3970

1.05

.0413

4.6

.1811

9.2

.3622

.0320

.1695

.4040

1.1

.0433

4.7

.1850

9.25

.3642

.0330

11/64

.1719

13/32

.4062

1.15

.0453

4.75

.1870

9.35

.3661

.0350

.1730

.4130

1.2

.0472

4.8

.1890

9.4

.3701

.0360

.1770

27/64

.4219

1.25

.0492

4.9

.1929

9.5

.3740

.0370

.1800

7/16

.4375

1.3

.0512

5.0

.1968

9.6

.3780

.0380

.1820

29/64

.4531

1.35

.0531

5.1

.2008

9.7

.3819

.0390

.1850

15/32

.4687

1.4

.0551

5.2

.2047

9.75

.3839

.0400

3/16

.1875

31/64

.4844

1.45

.0571

5.25

.2067

9.8

.3858

.0410

.1890

1/2

.5000

1.5

.0591

5.3

.2087

9.9

.3898

.0420

.1910

33/64

.5156

1.55

.0610

5.4

.2126

10.0

.3937

.0430

.1935

17/32

.5312

1.6

.0629

5.5

.2165

10.5

.4133

.0465

.1960

35/64

.5469

1.65

.0650

5.6

.2205

11.0

.4331

3/64

.0469

.1990

9/16

.5625

1.7

.0669

5.7

.2244

11.5

.4528

.0520

.2010

37/64

.5781

1.75

.0689

5.75

.2264

12.0

.4724

.0550

13/64

.2031

19/32

.5937

1.8

.0709

5.8

.2283

12.5

.4921

.0595

.2040

39/64

.6094

1.85

.0728

5.9

.2323

13.0

.5118

1/16

.0625

.2055

5/8

.6250

1.9

.0748

6.0

.2362

13.5

.5315

.0635

.2090

41/64

.6406

1.95

.0768

6.1

.2401

14.0

.5512

.0670

.2130

21/32

.6562

2.0

.0787

6.2

.2441

14.5

.5708

.0700

7/32

.2187

43/64

.6719

2.05

.0807

6.25

.2461

15.0

.5906

.0730

.2210

11/16

.6875

2.1

.0827

6.3

.2480

15.5

.6102

.0760

.2280

45/64

.7031

2.15

.0846

6.4

.2520

16.0

.6300

5/64

.0781

.2340

23/32

.7187

2.2

.0866

6.5

.2559

16.5

.6496

.0785

15/64

.2344

47/64

.7344

2.25

.0886

6.6

.2598

17.0

.6693

.0810

.2380

3/4

.7500

2.3

.0905

6.7

.2638

17.5

.6889

.0820

.2420

49/64

.7656

2.35

.0925

6.75

.2658

18.0

.7087

.0860

.2460

25/32

.7812

2.4

.0945

6.8

.2677

18.5

.7283

.0890

.2500

51/64

.7969

2.45

.0965

6.9

.2716

19.0

.7480

.0935

1/4

.2500

13/16

.8125

2.5

.0984

7.0

.2756

19.5

.7677

3/32

.0937

.2570

53/64

.8281

2.55

.1004

7.1

.2795

20.0

.7874

.0960

.2610

27/32

.8437

2.6

.1024

7.2

.2835

20.5

.8071

.0980

17/64

.2656

55/64

.8594

2.65

.1043

7.25

.2855

21.0

.8268

.0995

.2660

7/8

.8750

2.7

.1063

7.3

.2874

21.5

.8465

.1015

.2720

57/64

.8906

2.75

.1083

7.4

.2913

22.0

.8661

.1040

.2770

29/32

.9062

2.8

.1102

7.5

.2953

22.5

.8858

.1065

.2811

59/64

.9219

2.9

.1142

7.6

.2990

23.0

.9055

7/64

.1093

9/32

.2812

15/16

.9375

3.0

.1181

7.7

.3031

23.5

.9252

.1100

.2900

61/64

.9531

3.1

.1220

7.75

.3051

24.0

.9449

.1110

.2950

31/32

.9687

3.2

.1260

7.8

.3071

24.5

.9646

.1130

19/64

.2968

63/64

.9844

3.25

.1280

7.9

.3110

25.0

.9843

.1160

.3020

1.000

3.3

.1299

.1200

5/16

.3125

Fractional and Metric Sizes per. ANSI/ASME B94.11M-1993

Drill Bits, also called Twist drills are available with straight or tapered shanks though the most common drill bits will have straight shanks.

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