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Drill Bushing Size Chart Download

Download Our Free Drill Bushing Size Chart

Drill bushings, also known as drill guides, are parts that you install into drill jigs, gun drills, reamers, counterbores, and other shank-mounted cutting tool types as forms of guidance, support, lubrication, and to allow for easier positioning.

They feature high-quality materials like tool steel, tungsten carbide and stainless steel, often with knurled surfaces, and stop your cutting tool from bending or wandering as they enter a workpiece. They also come with accessories like lock screws. 

They are quite common in industrial applications and various industries and suit hobbyists and professionals working on metalworking projects. There are many different types of bushing available, which means it can often be worthwhile to contact a supplier or even drill bushing manufacturers to find out what you need. Sometimes, that process can also involve sizing, which is where a drill bushing size chart comes in.

To know the drill bushing size you require, you first need to know the necessary drill bushing dimensions, including the hole size, drill size, outside diameters, inside diameters, and more.

Before going through a catalog to find what you think will be the right tools and accessories for the job, download our free drill bushing size chart and consider this information below.

 

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Drill Bushing Size Chart

How do you size a drill bushing?

There are several standard drill bushings, including permanent bushings, renewable bushings, and air-feed drill bushings. They are all identified by ANSI letters and numbers, which helps you understand the bushing type and dimensions, almost like a part number. The bushing I.D generally has four decimal positions to determine the standard sizes:

  • Bushing type
  • Bushing OD (outside diameter)
  • Lengths in 16ths of an inch
  • Bushing ID (inside diameter) as a four-place decimal

The bushing’s length is measured from the underside of the head to the bushing’s exit point. This measurement process is also suitable for headless press-fit bushings, head-press-fit bushings, and press-fit bushings that are pressed into the jig plate and used for drilling or reaming.

They can be mounted with their heads exposed or counterbored. If the jig plate is counterbored, only this body diameter needs to be reamed.

These bushing types are the most common and least expensive and also come with recommended hole sizes based on the nominal bushing OD and actual bushing OD. Press-fit bushings are known for offering less resistance to heavy axial loads.

 

Decimal Inch

 

Fraction Inch

 

Number/Letter

 

Metric

 

.0135

  

#80

  

.0138

    

.35mm

.0145

  

#79

  

.0150

    

.38mm

.0156

1/64

    

.0157

    

.40mm

.0160

  

#78

  

.0165

    

.42mm

.0177

    

.45mm

.0180

  

#77

  

.0189

    

.48mm

.0197

    

.50mm

.0200

  

#76

  

.0210

  

#75

  

.0217

    

.55mm

.0225

  

#74

  

.0236

    

.60mm

.0240

  

#73

  

.0250

  

#72

  

.0256

    

.65mm

.0260

  

#71

  

.0276

    

.70mm

.0280

  

#70

  

.0292

  

#69

  

.0295

    

.75mm

.0310

  

#68

  

.0312

1/32

    

.0315

    

.80mm

.0320

  

#67

  

.0330

  

#66

  

.0335

    

.85mm

.0350

  

#65

  

.0354

    

.90mm

.0360

  

#64

  

.0370

  

#63

  

.0374

    

.95mm

.0380

  

#62

  

.0390

  

#61

  

.0394

    

1.00mm

.0400

  

#60

  

.0410

  

#59

  

.0413

    

1.05mm

.0420

  

#58

  

.0430

  

#57

  

.0433

    

1.10mm

.0453

    

1.15mm

.0465

  

#56

  

.0469

3/64

    

.0472

    

1.20mm

.0492

    

1.25mm

.0512

    

1.30mm

.0520

  

#55

  

.0531

    

1.35mm

.0550

  

#54

  

.0551

    

1.40mm

.0571

    

1.45mm

.0591

    

1.50mm

.0595

  

#53

  

.0610

    

1.55mm

.0625

1/16

    

.0630

    

1.60mm

.0635

  

#52

  

.0650

    

1.65mm

.0669

    

1.70mm

.0670

  

#51

  

.0689

    

1.75mm

.0700

  

#50

  

.0709

    

1.80mm

.0728

    

1.85mm

.0730

  

#49

  

.0748

    

1.90mm

.0760

  

#48

  

.0768

    

1.95mm

.0781

5/64

    

.0785

  

#47

  

.0787

    

2.00mm

.0807

    

2.05mm

.0810

  

#46

  

.0820

  

#45

  

.0827

    

2.10mm

.0846

    

2.15mm

.0860

  

#44

  

.0866

    

2.20mm

.0886

    

2.25mm

.0890

  

#43

  

.0906

    

2.30mm

.0925

    

2.35mm

.0935

  

#42

  

.0938

3/32

    

.0945

    

2.40mm

.0960

  

#41

  

.0965

    

2.45mm

.0980

  

#40

  

.0984

    

2.50mm

.0995

  

#39

  

.1004

    

2.55mm

.1015

  

#38

  

.1024

    

2.60mm

.1040

  

#37

  

.1043

    

2.65mm

.1063

    

2.70mm

.1065

  

#36

  

.1083

    

2.75mm

.1094

7/64

    

.1100

  

#35

  

.1102

    

2.80mm

.1110

  

#34

  

.1130

  

#33

  

.1142

    

2.90mm

.1160

  

#32

  

.1181

    

3.00mm

.1200

  

#31

  

.1220

    

3.10mm

.1250

1/8

    

.1260

    

3.20mm

.1280

    

3.25mm

.1285

  

#30

  

.1299

    

3.30mm

.1339

    

3.40mm

.1360

  

#29

  

.1378

    

3.50mm

.1405

  

#28

  

.1406

9/64

    

.1417

    

3.60mm

.1440

  

#27

  

.1457

    

3.70mm

.1470

  

#26

  

.1476

    

3.75mm

.1495

  

#25

  

.1496

    

3.80mm

.1520

  

#24

  

.1535

    

3.90mm

.1540

  

#23

  

.1562

5/32

    

.1570

  

#22

—

.1575

    

4.00mm

.1590

  

#21

  

.1610

  

#20

  

.1614

    

4.10mm

.1654

    

4.20mm

.1660

  

#19

  

.1673

    

4.25mm

.1693

    

4.30mm

.1695

  

#18

  

.1719

11/64

    

.1730

  

#17

  

.1732

    

4.40mm

.1770

  

#16

  

.1772

    

4.50mm

.1800

  

#15

  

.1811

    

4.60mm

.1850

  

#13

4.70mm

.1870

    

4.75mm

.1875

3/16

    

.1890

  

#12

  

.1910

  

#11

  

.1929

    

4.90mm

.1935

  

#10

  

.1960

  

#9

  

.1969

    

5.00mm

.1990

  

#8

  

.2008

    

5.10mm

.2010

  

#7

  

.2031

13/64

    

.2040

  

#6

  

.2047

    

5.20mm

.2055

  

#5

  

.2067

    

5.25mm

.2087

    

5.30mm

.2090

  

#4

  

.2126

    

5.40mm

.2130

  

#3

  

.2165

    

5.50mm

.2188

7/32

    

.2205

    

5.60mm

.2210

  

#2

  

.2244

    

5.70mm

.2264

    

5.75mm

.2280

  

#1

  

.2283

    

5.80mm

.2323

    

5.90mm

.2340

  

A

  

.2344

15/64

    

.2362

    

6.00mm

.2380

  

B

  

.2402

    

6.10mm

.2420

  

C

  

.2441

    

6.20mm

.2460

  

D

  

.2461

    

6.25mm

.2480

    

6.30mm

.2500

1/4

E

  

.2520

    

6.40mm

.2559

    

6.50mm

.2570

  

F

  

.2598

    

6.60mm

.2610

  

G

  

.2638

    

6.70mm

.2656

17/64

    

.2657

    

6.75mm

.2660

  

H

  

.2677

    

6.80mm

.2717

    

6.90mm

.2720

  

I

  

.2756

    

7.00mm

.2770

  

J

  

.2795

    

7.10mm

.2810

  

K

  

.2812

9/32

    

.2835

    

7.20mm

.2854

    

7.25mm

.2874

    

7.30mm

.2900

  

L

  

.2913

    

7.40mm

.2950

  

M

  

.2953

    

7.50mm

.2969

19/64

    

.2992

    

7.60mm

.3020

  

N

  

.3031

    

7.70mm

.3051

    

7.75mm

.3071

    

7.80mm

.3110

    

7.90mm

.3125

5/16

    

.3150

    

8.00mm

.3160

  

O

  

.3189

    

8.10mm

.3228

    

8.20mm

.3230

  

P

  

.3248

    

8.25mm

.3268

    

8.30mm

.3281

21/64

    

.3307

    

8.40mm

.3320

  

Q

  

.3346

    

8.50mm

.3386

    

8.60mm

.3390

  

R

  

.3425

    

8.70mm

.3438

11/32

    

.3445

    

8.75mm

.3465

    

8.80mm

.3480

  

S

  

.3504

    

8.90mm

.3543

    

9.00mm

.3580

  

T

  

.3583

    

9.10mm

.3594

23/64

    

.3622

    

9.20mm

.3642

    

9.25mm

.3661

    

9.30mm

.3680

  

U

  

.3701

    

9.40mm

.3740

    

9.50mm

.3750

3/8

    

.3770

  

V

  

.3780

    

9.60mm

.3819

    

9.70mm

.3839

    

9.75mm

.3858

    

9.80mm

.3860

  

W

  

.3898

    

9.90mm

.3906

25/64

    

.3937

    

10.00mm

.3970

  

X

  

.4016

    

10.20mm

.4040

  

Y

  

.4062

13/32

    

.4130

  

Z

  

.4134

    

10.50mm

.4219

27/64

    

.4252

    

10.80mm

.4331

    

11.00mm

.4375

7/16

    

.4409

    

11.20mm

.4528

    

11.50mm

.4531

29/64

    

.4646

    

11.80mm

.4688

15/32

    

.4724

    

12.00mm

.4803

    

12.20mm

.4844

31/64

    

.4921

    

12.50mm

.5000

1/2

    

.5118

    

13.00mm

.5156

33/64

    

.5312

17/32

    

.5315

    

13.50mm

.5469

35/64

    

.5512

    

14.00mm

.5625

9/16

    

.5709

    

14.50mm

.5781

37/64

    

.5906

    

15.00mm

.5938

19/32

    

.6094

39/64

    

.6102

    

15.50mm

.6250

5/8

    

.6299

    

16.00mm

.6406

41/64

    

.6496

    

16.50mm

.6562

21/32

    

.6693

    

17.00mm

.6719

43/64

    

.6875

11/16

    

.6890

    

17.50mm

.7031

45/64

    

.7087

    

18.00mm

.7188

23/32

    

.7283

    

18.50mm

.7344

47/64

    

.7480

    

19.00mm

.7500

3/4

    

.7656

49/64

    

.7677

    

19.50mm

.7812

25/32

    

.7874

    

20.00mm

.7969

51/64

    

.8071

    

20.50mm

.8125

13/16

    

.8268

    

21.00mm

.8281

53/64

    

.8438

27/32

    

.8465

    

21.50mm

.8594

55/64

    

.8661

    

22.00mm

.8750

7/8

    

.8858

    

22.50mm

.8906

57/64

    

.9055

    

23.00mm

.9062

29/32

    

.9219

59/64

    

.9252

    

23.50mm

.9375

15/16

    

.9449

    

24.00mm

.9531

61/64

    

.9646

    

24.50mm

.9688

31/32

    

.9843

    

25.00mm

.9844

63/64

    

1.0000

1

    

1.0156

1-1/64

    

1.0236

    

26.00mm

1.0312

1-1/32

    

1.0469

1-3/64

    

1.0625

1-1/16

    

1.0630

    

27.00mm

1.0781

1-5/64

    

1.0938

1-3/32

    

1.1024

    

28.00mm

1.1094

1-7/64

    

1.1250

1-1/8

    

1.1406

1-9/64

    

1.1417

    

29.00mm

1.1562

1-5/32

    

1.1719

1-11/64

    

1.1811

    

30.00mm

1.1875

1-3/16

    

1.2031

1-13/64

    

1.2188

1-7/32

    

1.2205

    

31.00mm

1.2344

1-15/64

    

1.2500

1-1/4

    

1.2598

    

32.00mm

1.2656

1-17/64

    

1.2812

1-9/32

    

1.2969

1-19/64

    

1.2992

    

33.00mm

1.3125

1-5/16

    

1.3281

1-21/64

    

1.3386

    

34.00mm

1.3438

1-11/32

    

1.3594

1-23/64

    

1.3750

1-3/8

    

1.3780

    

35.00mm

1.3906

1-25/64

    

1.4062

1-13/32

    

1.4173

    

36.00mm

1.4219

1-27/64

    

1.4375

1-7/16

    

1.4531

1-29/64

    

1.4567

    

37.00mm

1.4688

1-15/32

    

1.4844

1-31/64

    

1.4961

    

38.00mm

1.5000

1-1/2

    

1.5156

1-33/64

    

1.5312

1-17/32

    

1.5354

    

39.00mm

1.5469

1-35/64

    

1.5625

1-9/16

    

1.5748

    

40.00mm

1.5781

1-37/64

    

1.5938

1-19/32

    

1.6094

1-39/64

    

1.6142

    

41.00mm

1.6250

1-5/8

    

1.6406

1-41/64

    

1.6535

    

42.00mm

1.6562

1-21/32

    

1.6719

1-43/64

    

1.6875

1-11/16

    

1.6929

    

43.00mm

1.7031

1-45/64

    

1.7188

1-23/32

    

1.7323

    

44.00mm

1.7344

1-47/64

    

1.7500

1-3/4

    

1.7656

1-49/64

    

1.7717

    

45.00mm

1.7812

1-25/32

    

1.7969

1-51/64

    

1.8110

    

46.00mm

1.8125

1-13/16

    

1.8281

1-53/64

    

1.8438

1-27/32

    

1.8504

    

47.00mm

1.8594

1-55/64

    

1.8750

1-7/8

    

1.8898

    

48.00mm

1.9685

    

50.00mm

2.0000

2

    

2.0312

2-1/32

    

2.0625

2-1/16

    

2.0938

2-3/32

    

2.1250

2-1/8

    

2.1562

2-5/32

    

2.1654

    

55.00mm

2.1875

2-3/16

    

2.2188

2-7/32

    

2.2500

2-1/4

    

2.3120

2-5/16

    

2.3622

    

60.00mm

2.4375

2-7/16

    

2.5000

2-1/2

    

2.5591

    

65.00mm

2.5625

2-9/16

    

2.625

2-5/8

    

2.6875

2-11/16

    

2.7500

2-3/4

    

2.7559

    

70.00mm

2.8125

2-13/16

    

2.8750

2-7/8

    

2.9375

2-15/16

    

2.9528

    

75.00mm

3.0000

3

    

3.0625

3-1/16

    

3.1250

3-1/8

    

3.1496

    

80.00mm

3.1875

3-3/16

    

3.2500

3-1/4

    

3.3125

3-15/16

    

3.3465

    

85.00mm

3.3750

3-3/8

    

3.4375

3-7/16

    

3.5000

3-1/2

    

3.5433

    

90.00mm

3.5625

3-9/16

    

3.625

3-5/8

    

3.6875

3-11/16

    

3.7402

    

95.00mm

3.7500

3-3/4

    

3.8125

3-13/16

    

3.8750

3-7/8

    

3.9370

    

100.00mm

3.9375

3-15/16

    

4.0000

4

    

4.0625

4-1/16

    

4.1250

4-1/8

    

4.1339

    

105.00mm

4.1875

4-3/16

    

4.2500

4-1/4

    

Bushing Dimensions Overview

Your specific application and needs, like whether you need special bushings such as type H, liner bushings, or thin wall bushings, can determine the dimensions you require. These include the total diameter, length-thru-bore, depth, and more.

However, bore size is the most commonly searched bushing dimension, with most metric bore sizes ranging from ½-inch to 4-5/8-inch. Fortunately, when you do your research and shop with reputable suppliers in the U.S., you get to make use of diagrams and drill bushing size charts to determine the dimensions and bushing installation requirements to suit your unique needs.

If you end up with a bushing that isn’t the right size and you’ve decided to grind it down, ensure that you use a grinding mandrel to get the necessary inside and outside diameter concentricity.

Download Our Drill Bushing Size Chart

There can be so much involved in the drill bushing purchasing process, particularly as you need to familiarize yourself with ID ranges, ID sizes, spacing, interference fits, and much more.

Before you end up with the wrong sized drill bushing for your needs, take a moment to download our free drill bushing size chart. You can then have all the knowledge you need to make an informed purchasing decision.

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