External Metric Thread Table Chart and Fastener Sizes M1.6 (2024)

External Metric Thread Table Chart and Fastener Sizes M1.6 - M18

ISO Hardware Engineering Data Fastener and Screw / Bolt Design, Formula and Calculations

The following table chart defines standard metric external thread size M1.6 to M18 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Do not use these values for standard metric internal thread design. All units in mm. These are the M Profile limiting Dimensionings.

External Metric Thread Table Chart and Fastener Sizes M1.6 (1)

Where:

H = P ( 31/2 / 2 ) = 0.866025 P or 0.125H = 0.108253P

ISO Metric
Thread
Designation

Pitch

External Threads

Tolerance
Class

Major Dia

Pitch Dia

Minor Dia

Max

Min

Max

Min

Max

Min

M1.6 x 0.35

0.35

6g

1.581

1.496

1.354

1.291

1.202

1.075

M1.6 x 0.35

0.35

4g6g

1.581

1.496

1.354

1.314

1.202

1.098

M1.6 x 0.3

0.3

6g

1.582

1.507

1.387

1.342

1.257

1.157

M1.6 x 0.3

0.3

4g6g

1.582

1.507

1.387

1.359

1.257

1.174

M1.6 x 0.2

0.2

6g

1.583

1.527

1.453

1.403

1.366

1.280

M1.6 x 0.2

0.2

4g6g

1.583

1.527

1.453

1.421

1.366

1.298

M1.7 x 0.35

0.35

6g

1.681

1.596

1.454

1.391

1.302

1.175

M1.7 x 0.35

0.35

4g6g

1.681

1.596

1.454

1.414

1.302

1.198

M1.8 x 0.35

0.35

6g

1.781

1.696

1.554

1.491

1.402

1.275

M1.8 x 0.35

0.35

4g6g

1.781

1.696

1.554

1.514

1.402

1.298

M1.8 x 0.2

0.2

6g

1.783

1.727

1.653

1.603

1.566

1.480

M1.8 x 0.2

0.2

4g6g

1.783

1.727

1.653

1.621

1.566

1.498

M2 x 0.4

0.4

6g

1.981

1.886

1.721

1.654

1.548

1.408

M2 x 0.4

0.4

4g6g

1.981

1.886

1.721

1.679

1.548

1.433

M2 x 0.25

0.25

6g

1.982

1.915

1.820

1.764

1.711

1.610

M2 x 0.25

0.25

4g6g

1.982

1.915

1.820

1.784

1.711

1.630

M2.2 x 0.45

0.45

6g

2.180

2.080

1.888

1.817

1.693

1.540

M2.2 x 0.45

0.45

4g6g

2.180

2.080

1.888

1.843

1.693

1.566

M2.2 x 0.25

0.25

6g

2.182

2.115

2.020

1.964

1.911

1.810

M2.2 x 0.25

0.25

4g6g

2.182

2.115

2.020

1.984

1.911

1.830

M2.3 x 0.45

0.45

6g

2.280

2.180

1.988

1.917

1.793

1.640

M2.3 x 0.45

0.45

4g6g

2.280

2.180

1.988

1.943

1.793

1.666

M2.3 x 0.4

0.4

6g

2.281

2.186

2.021

1.954

1.848

1.708

M2.3 x 0.4

0.4

4g6g

2.281

2.186

2.021

1.979

1.848

1.733

M2.5 x 0.45

0.45

6g

2.480

2.380

2.188

2.117

1.993

1.840

M2.5 x 0.45

0.45

4g6g

2.480

2.380

2.188

2.143

1.993

1.866

M2.5 x 0.35

0.35

6g

2.481

2.396

2.254

2.191

2.102

1.975

M2.5 x 0.35

0.35

4g6g

2.481

2.396

2.254

2.214

2.102

1.998

M2.6 x 0.45

0.45

6g

2.580

2.480

2.288

2.217

2.093

1.940

M2.6 x 0.45

0.45

4g6g

2.580

2.480

2.288

2.243

2.093

1.966

M3 x 0.5

0.5

6g

2.980

2.874

2.655

2.580

2.439

2.272

M3 x 0.5

0.5

4g6g

2.980

2.874

2.655

2.607

2.439

2.299

M3 x 0.35

0.35

6g

2.981

2.896

2.754

2.687

2.602

2.471

M3 x 0.35

0.35

4g6g

2.981

2.896

2.754

2.712

2.602

2.496

M3.5 x 0.6

0.6

6g

3.479

3.354

3.089

3.004

2.829

2.635

M3.5 x 0.6

0.6

4g6g

3.479

3.354

3.089

3.036

2.829

2.667

M3.5 x 0.35

0.35

6g

3.481

3.396

3.254

3.187

3.102

2.971

M3.5 x 0.35

0.35

4g6g

3.481

3.396

3.254

3.212

3.102

2.996

M4 x 0.7

0.7

6g

3.978

3.838

3.523

3.433

3.220

3.002

M4 x 0.7

0.7

4g6g

3.978

3.838

3.523

3.467

3.220

3.036

M4 x 0.5

0.5

6g

3.980

3.874

3.655

3.580

3.439

3.272

M4 x 0.5

0.5

4g6g

3.980

3.874

3.655

3.607

3.439

3.299

M4.5 x 0.75

0.75

6g

4.478

4.338

3.991

3.901

3.666

3.439

M4.5 x 0.75

0.75

4g6g

4.478

4.338

3.991

3.935

3.666

3.473

M4.5 x 0.5

0.5

6g

4.480

4.374

4.155

4.080

3.939

3.772

M4.5 x 0.5

0.5

4g6g

4.480

4.374

4.155

4.107

3.939

3.799

M5 x 0.8

0.8

6g

4.976

4.826

4.456

4.361

4.110

3.869

M5 x 0.8

0.8

4g6g

4.976

4.826

4.456

4.396

4.110

3.904

M5 x 0.5

0.5

6g

4.980

4.874

4.655

4.580

4.439

4.272

M5 x 0.5

0.5

4g6g

4.980

4.874

4.655

4.607

4.439

4.299

M5.5 x 0.5

0.5

6g

5.480

5.374

5.155

5.065

4.939

4.757

M5.5 x 0.5

0.5

4g6g

5.480

5.374

5.155

5.099

4.939

4.791

M6 x 1

1

6g

5.974

5.794

5.324

5.212

4.891

4.596

M6 x 1

1

4g6g

5.974

5.794

5.324

5.253

4.891

4.637

M6 x 0.8

0.8

6g

5.976

5.826

5.456

5.376

5.110

4.884

M6 x 0.8

0.8

4g6g

5.976

5.826

5.456

5.406

5.110

4.914

M6 x 0.75

0.75

6g

5.978

5.838

5.491

5.391

5.166

4.929

M6 x 0.75

0.75

4g6g

5.978

5.838

5.491

5.428

5.166

4.966

M6 x 0.7

0.7

6g

5.978

5.838

5.523

5.428

5.220

4.997

M6 x 0.7

0.7

4g6g

5.978

5.838

5.523

5.463

5.220

5.032

M6 x 0.5

0.5

6g

5.980

5.874

5.655

5.570

5.439

5.262

M6 x 0.5

0.5

4g6g

5.980

5.874

5.655

5.602

5.439

5.294

M7 x 1

1

6g

6.974

6.794

6.324

6.212

5.891

5.596

M7 x 1

1

4g6g

6.974

6.794

6.324

6.253

5.891

5.637

M7 x 0.75

0.75

6g

6.978

6.838

6.491

6.391

6.166

5.929

M7 x 0.75

0.75

4g6g

6.978

6.838

6.491

6.428

6.166

5.966

M7 x 0.5

0.5

6g

6.980

6.874

6.655

6.570

6.439

6.262

M7 x 0.5

0.5

4g6g

6.980

6.874

6.655

6.602

6.439

6.294

M8 x 1.25

1.25

6g

7.972

7.760

7.160

7.042

6.619

6.272

M8 x 1.25

1.25

4g6g

7.972

7.760

7.160

7.085

6.619

6.315

M8 x 1

1

6g

7.974

7.794

7.324

7.212

6.891

6.596

M8 x 1

1

4g6g

7.974

7.794

7.324

7.253

6.891

6.637

M8 x 0.8

0.8

6g

7.976

7.826

7.456

7.350

7.110

6.858

M8 x 0.8

0.8

4g6g

7.976

7.826

7.456

7.389

7.110

6.897

M8 x 0.75

0.75

6g

7.978

7.838

7.491

7.391

7.166

6.929

M8 x 0.75

0.75

4g6g

7.978

7.838

7.491

7.428

7.166

6.966

M8 x 0.5

0.5

6g

7.980

7.874

7.655

7.570

7.439

7.262

M8 x 0.5

0.5

4g6g

7.980

7.874

7.655

7.602

7.439

7.294

M9 x 1.25

1.25

6g

8.972

8.760

8.160

8.042

7.619

7.272

M9 x 1.25

1.25

4g6g

8.972

8.760

8.160

8.085

7.619

7.315

M9 x 1

1

6g

8.974

8.794

8.324

8.212

7.891

7.596

M9 x 1

1

4g6g

8.974

8.794

8.324

8.253

7.891

7.637

M9 x 0.75

0.75

6g

8.978

8.838

8.491

8.391

8.166

7.929

M9 x 0.75

0.75

4g6g

8.978

8.838

8.491

8.428

8.166

7.966

M9 x 0.5

0.5

6g

8.980

8.874

8.655

8.570

8.439

8.262

M9 x 0.5

0.5

4g6g

8.980

8.874

8.655

8.602

8.439

8.294

M10 x 1.5

1.5

6g

9.968

9.732

8.994

8.862

8.344

7.938

M10 x 1.5

1.5

4g6g

9.968

9.732

8.994

8.909

8.344

7.985

M10 x 1.25

1.25

6g

9.972

9.760

9.160

9.042

8.619

8.272

M10 x 1.25

1.25

4g6g

9.972

9.760

9.160

9.085

8.619

8.315

M10 x 1.12

1.12

6g

9.973

9.783

9.246

9.128

8.761

8.438

M10 x 1.12

1.12

4g6g

9.973

9.783

9.246

9.171

8.761

8.481

M10 x 1

1

6g

9.974

9.794

9.324

9.212

8.891

8.596

M10 x 1

1

4g6g

9.974

9.794

9.324

9.253

8.891

8.637

M10 x 0.75

0.75

6g

9.978

9.838

9.491

9.391

9.166

8.929

M10 x 0.75

0.75

4g6g

9.978

9.838

9.491

9.428

9.166

8.966

M10 x 0.5

0.5

6g

9.980

9.874

9.655

9.570

9.439

9.262

M10 x 0.5

0.5

4g6g

9.980

9.874

9.655

9.602

9.439

9.294

M11 x 1.5

1.5

6g

10.968

10.732

9.994

9.862

9.344

8.938

M11 x 1.5

1.5

4g6g

10.968

10.732

9.994

9.911

9.344

8.987

M11 x 1

1

6g

10.974

10.794

10.324

10.212

9.891

9.596

M11 x 1

1

4g6g

10.974

10.794

10.324

10.253

9.891

9.637

M11 x 0.75

0.75

6g

10.978

10.838

10.491

10.391

10.166

9.929

M11 x 0.75

0.75

4g6g

10.978

10.838

10.491

10.428

10.166

9.966

M11 x 0.5

0.5

6g

10.980

10.874

10.655

10.570

10.439

10.262

M11 x 0.5

0.5

4g6g

10.980

10.874

10.655

10.602

10.439

10.294

M12 x 1.75

1.75

6g

11.966

11.701

10.829

10.679

10.072

9.601

M12 x 1.75

1.75

4g6g

11.966

11.701

10.829

10.734

10.072

9.656

M12 x 1.5

1.5

6g

11.968

11.732

10.994

10.854

10.344

9.930

M12 x 1.25

1.25

6g

11.972

11.760

11.160

11.028

10.619

10.258

M12 x 1.25

1.25

4g6g

11.972

11.760

11.160

11.075

10.619

10.305

M12 x 1

1

6g

11.974

11.794

11.324

11.206

10.891

10.590

M12 x 1

1

4g6g

11.974

11.794

11.324

11.249

10.891

10.633

M12 x 0.75

0.75

6g

11.978

11.838

11.491

11.385

11.166

10.923

M12 x 0.75

0.75

4g6g

11.978

11.838

11.491

11.424

11.166

10.962

M12 x 0.5

0.5

6g

11.980

11.874

11.655

11.565

11.439

11.257

M12 x 0.5

0.5

4g6g

11.980

11.874

11.655

11.598

11.439

11.290

M14 x 2

2

6g

13.962

13.682

12.663

12.503

11.797

11.271

M14 x 2

2

4g6g

13.962

13.682

12.663

12.563

11.797

11.331

M14 x 1.5

1.5

6g

13.968

13.732

12.994

12.854

12.344

11.930

M14 x 1.5

1.5

4g6g

13.968

13.732

12.994

12.904

12.344

11.980

M14 x 1.25

1.25

6g

13.972

13.760

13.160

13.028

12.619

12.258

M14 x 1.25

1.25

4g6g

13.972

13.760

13.160

13.075

12.619

12.305

M14 x 1

1

6g

13.974

13.794

13.324

13.206

12.891

12.590

M14 x 1

1

4g6g

13.974

13.794

13.324

13.250

12.891

12.634

M14 x 0.75

0.75

6g

13.978

13.838

13.491

13.385

13.166

12.923

M14 x 0.75

0.75

4g6g

13.978

13.838

13.491

13.424

13.166

12.962

M14 x 0.5

0.5

6g

13.980

13.874

13.655

13.565

13.439

13.257

M14 x 0.5

0.5

4g6g

13.980

13.874

13.655

13.598

13.439

13.290

M15 x 1.5

1.5

6g

14.968

14.732

13.994

13.854

13.344

12.930

M15 x 1.5

1.5

4g6g

14.968

14.732

13.994

13.904

13.344

12.980

M15 x 1

1

6g

14.974

14.794

14.324

14.206

13.891

13.590

M15 x 1

1

4g6g

14.974

14.794

14.324

14.249

13.891

13.633

M16 x 2

2

6g

15.962

15.682

14.663

14.503

13.797

13.271

M16 x 2

2

4g6g

15.962

15.682

14.663

14.563

13.797

13.331

M16 x 1.6

1.6

6g

15.968

15.756

14.929

14.824

14.236

13.838

M16 x 1.6

1.6

4g6g

15.968

15.756

14.929

14.863

14.236

13.877

M16 x 1.5

1.5

6g

15.968

15.732

14.994

14.854

14.344

13.930

M16 x 1.5

1.5

4g6g

15.968

15.732

14.994

14.904

14.344

13.980

M16 x 1.25

1.25

6g

15.972

15.760

15.160

15.028

14.619

14.258

M16 x 1.25

1.25

4g6g

15.972

15.760

15.160

15.075

14.619

14.305

M16 x 1

1

6g

15.974

15.794

15.324

15.206

14.891

14.590

M16 x 1

1

4g6g

15.974

15.794

15.324

15.249

14.891

14.633

M16 x 0.75

0.75

6g

15.978

15.838

15.491

15.385

15.166

14.923

M16 x 0.75

0.75

4g6g

15.978

15.838

15.491

15.424

15.166

14.962

M16 x 0.5

0.5

6g

15.980

15.874

15.655

15.565

15.439

15.257

M16 x 0.5

0.5

4g6g

15.980

15.874

15.655

15.599

15.439

15.291

M17 x 1.5

1.5

6g

16.968

16.732

15.994

15.854

15.344

14.930

M17 x 1.5

1.5

4g6g

16.968

16.732

15.994

15.904

15.344

14.980

M17 x 1

1

6g

16.974

16.794

16.324

16.206

15.891

15.590

M17 x 1

1

4g6g

16.974

16.794

16.324

16.249

15.891

15.633

M18 x 2.5

2.5

6g

17.958

17.623

16.334

16.164

15.252

14.624

M18 x 2.5

2.5

4g6g

17.958

17.623

16.334

16.228

15.252

14.688

M18 x 2

2

6g

17.962

17.682

16.663

16.503

15.797

15.271

M18 x 2

2

4g6g

17.962

17.682

16.663

16.563

15.797

15.331

M18 x 1.5

1.5

6g

17.968

17.732

16.994

16.854

16.344

15.930

M18 x 1.5

1.5

4g6g

17.968

17.732

16.994

16.904

16.344

15.980

M18 x 1.25

1.25

6g

17.972

17.760

17.160

17.028

16.619

16.258

M18 x 1.25

1.25

4g6g

17.972

17.760

17.160

17.075

16.619

16.305

M18 x 1

1

6g

17.974

17.794

17.324

17.206

16.891

16.590

M18 x 1

1

4g6g

17.974

17.794

17.324

17.249

16.891

16.633

M18 x 0.75

0.75

6g

17.978

17.838

17.491

17.385

17.166

16.923

M18 x 0.75

0.75

4g6g

17.978

17.838

17.491

17.424

17.166

16.962

M18 x 0.5

0.5

6g

17.980

17.874

17.655

17.565

17.439

17.257

M18 x 0.5

0.5

4g6g

17.980

17.874

17.655

17.599

17.439

17.291

Related:

  • ANSI Inch Unit Hardware Design Guide
  • Length of Screw Thread Engagement per. ISO 965-1 Calculator, Formula and Table Length of engagement of mating threads is selected to utilize full tensile strength of a bolt prior to shearing and nut threads.
  • Fastener Thread Designations and Definitions Pitch, Minor, Major Diameters
  • Standard External Metric Thread and Fastener Sizes M 0.25 - M 1.4
  • Metric External Table Chart Thread Sizes M 20 - M 55
  • Metric External Table Chart Thread Sizes M 56 - M 78
  • Metric External Table Chart Thread Sizes M 80 - M 100
  • Metric External Table Chart Thread Sizes M 105 - M 135
  • Metric External Table Chart Thread Sizes M 140 to M 175
  • Metric External Table Chart Thread Sizes M 180 to M 255
  • Metric External Table Chart Thread Sizes M 260 to M 1060

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External Metric Thread Table Chart and Fastener Sizes M1.6 (2024)
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