Cálculo do torque admissível do aperto do parafuso

T = C.D .F F = t.AF onde:

T = C.D.t.AF T - Torque admissível [Kgf.mm]

F - Força admissível [Kgf]

C = Coeficiente de correção

C = 0,15 - com lubrificação t - Tensão admissível [Kgf/mm2]

C = 0,20 - sem lubrificação te - Tensão de escoamento [Kgf/mm2]

tr - Tensão de ruptura [Kgf/mm2]

Considerando C sem lubrificação, temos:  - 3,1415

D - Diâmetro nominal [mm]

T = 0,2.D .t.AF [Kgf.m] AF = Área do filete

1000 AF = ( (Ø NÚCLEO + Ø FLANCO)/2) 2 * /4

MA= (Rosca métrica grossa ou normal)

Torque admissível para aperto de parafusos MB= (Rosca métrica fina)

Para parafusos da série métrica temos:

- Classe 4.6

- Classe 5.8

- Classe 8.8

tr = 40 Kgf/mm2

tr = 50 Kgf/mm2

tr = 80 Kgf/mm2

te = 24 Kgf/mm2

te = 40 Kgf/mm2

te = 64 Kgf/mm2

- Classe 9.8

- Classe 10.9

- Classe 12.9

tr = 90 Kgf/mm2

tr = 100 Kgf/mm2

tr = 120 Kgf/mm2

te = 72 Kgf/mm2

te = 90 Kgf/mm2

te = 108 Kgf/mm2

Para parafusos da série polegada temos:

- Grau 1

- Grau 2

- Grau 5

tr = 42 Kgf/mm2

tr = 52 Kgf/mm2

tr = 84 Kgf/mm2

te = 25.3 Kgf/mm2

te = 40 Kgf/mm2

te = 64.7 Kgf/mm2

- Grau 7

- Grau 8

tr = 93.5 Kgf/mm2

tr = 105.4 Kgf/mm2

te = 80.8 Kgf/mm2

te = 91.4 Kgf/mm2

TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE MÉTRICA

ITEM

BITOLA

TENSÃO ADMISSÍVEL = 90% DA TENSÃO DE ESCOAMENTO

AF

CL 4.6

CL 5.8

CL 8.8

CL 9.8

CL 10.8

CL 12.9

01

MA

5

13,614

0,294

0,490

0,784

0,882

1,103

1,323

02

MB

5

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

03

MA

6

19,333

0,501

0,835

1,336

1,503

1,879

2,255

04

MB

6

21,661

0,561

0,935

1,497

1,684

2,105

2,526

05

MA

8

35,441

1,225

2,041

3,266

3,675

4,593

5,512

06

MB

8

38,062

1,315

2,192

3,507

3,946

4,933

5,919

07

MA

10

56,318

2,433

4,054

6,488

7,299

9,124

10,948

08

MB

10

63,074

2,724

4,541

7,266

8,174

10,218

12,262

09

MA

12

81,993

4,250

7,084

11,334

12,752

15,939

19,127

10

MB

12

85,997

4,458

7,430

11,888

13,374

16,718

20,061

11

MA

14

112,523

6,805

11,342

18,147

20,416

25,520

30,624

12

MB

14

122,012

7,379

12,298

19,678

22,138

27,672

33,207

13

MA

16

152,268

10,594

17,656

28,250

31,782

39,727

47,672

14

MB

16

164,311

11,357

18,928

30,286

34,072

42,589

51,107

15

MA

20

240,047

20,740

34,566

55,307

62,220

77,775

93,330

16

MB

20

267,757

23,134

38,557

61,691

69,403

86,753

104,104

TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE MÉTRICA

ITEM

BITOLA

TENSÃO ADMISSÍVEL = TENSÃO DE ESCOAMENTO

AF

CL 4.6

CL 5.8

CL 8.8

CL 9.8

CL 10.8

CL 12.9

01

MA

5

13,614

0,327

0,544

0,871

0,980

1,225

1,470

02

MB

5

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

03

MA

6

19,333

0,557

0,927

1,485

1,670

2,087

2,506

04

MB

6

21,661

0,624

1,038

1,664

1,872

2,338

2,807

05

MA

8

35,441

1,361

2,267

3,629

4,083

5,103

6,124

06

MB

8

38,062

1,462

2,435

3,898

4,385

5,481

6,577

07

MA

10

56,318

2,703

4,505

7,209

8,110

10,137

12,165

08

MB

10

63,074

3,027

5,045

8,073

9,083

11,353

13,624

09

MA

12

81,993

4,723

7,871

12,594

14,168

17,710

21,253

10

MB

12

85,997

4,948

8,255

13,209

14,860

18,575

22,290

11

MA

14

112,523

7,562

12,602

20,164

22,685

28,355

34,027

12

MB

14

122,012

8,199

13,665

21,865

24,598

30,746

36,896

13

MA

16

153,012

11,771

19,618

31,389

35,313

44,141

52,969

14

MB

16

164,311

12,619

21,031

33,651

37,857

47,321

56,786

15

MA

20

240,047

23,045

38,407

61,452

69,134

86,416

103,700

16

MB

20

267,757

25,705

42,841

68,546

77,114

96,392

115,671

TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE MÉTRICA

ITEM

BITOLA

TENSÃO ADMISSÍVEL = 80% DA TENSÃO DE RUPTURA

T.AD. = 90% DA T.R.

AF

CL 4.6

CL 5.8

CL 8.8

CL 9.8

CL 10.8

CL 12.9

01

MA

5

13,614

0,436

0,544

0,871

1,103

1,225

1,470

02

MB

5

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

03

MA

6

19,333

0,742

0,927

1,485

1,879

2,088

2,506

04

MB

6

21,661

0,832

1,039

1,664

2,215

2,339

2,807

05

MA

8

35,441

1,815

2,268

3,629

4,593

5,104

6,124

06

MB

8

38,062

1,949

2,435

3,898

4,933

5,481

6,577

07

MA

10

56,318

3,604

4,505

7,209

9,124

10,137

12,165

08

MB

10

63,074

4,037

5,045

8,073

10,218

11,353

13,624

09

MA

12

81,993

6,297

7,871

12,594

15,939

17,710

21,253

10

MB

12

85,997

6,605

8,255

13,209

16,718

18,575

22,290

11

MA

14

112,523

10,082

12,602

20,164

25,520

28,356

34,027

12

MB

14

122,012

10,932

13,665

21,865

27,672

30,747

36,896

13

MA

16

152,268

15,695

19,618

31,389

39,727

44,141

52,969

14

MB

16

164,311

16,825

21,031

33,651

42,589

47,322

56,786

15

MA

20

240,047

30,726

38,407

61,452

77,775

86,417

103,700

16

MB

20

267,757

34,273

42,841

68,546

86,753

96,393

115,671

TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE MÉTRICA

ITEM

BITOLA

TENSÃO ADMISSÍVEL = TENSÃO DE RUPTURA

AF

CL 4.6

CL 5.8

CL 8.8

CL 9.8

CL 10.8

CL 12.9

01

MA

5

13,614

0,545

0,680

1,089

1,225

1,361

1,634

02

MB

5

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

- - - - - -

03

MA

6

19,333

0,928

1,159

1,856

2,088

2,319

2,784

04

MB

6

21,661

1,040

1,299

2,079

2,339

2,599

3,119

05

MA

8

35,441

2,268

2,835

4,536

5,104

5,671

6,804

06

MB

8

38,062

2,436

3,044

4,872

5,481

6,090

7,308

07

MA

10

56,318

4,505

5,631

9,011

10,137

11,263

13,517

08

MB

10

63,074

5,046

6,307

10,092

11,353

12,614

15,138

09

MA

12

81,993

7,871

9,839

15,743

17,710

19,678

23,614

10

MB

12

85,997

8,256

10,319

16,511

18,575

20,639

24,767

11

MA

14

112,523

12,603

15,735

25,205

28,356

31,507

37,808

12

MB

14

122,012

13,665

17,081

27,331

30,747

34,163

40,996

13

MA

16

153,268

19,618

24,522

39,237

44,141

49,046

58,854

14

MB

16

164,311

21,032

26,289

42,064

47,322

52,580

63,096

15

MA

20

240,047

38,408

48,009

76,815

86,417

96,019

115,222

16

MB

20

267,757

42,841

53,551

85,682

96,393

107,103

128,523

TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE POLEGADA

ITEM

BITOLA

TENSÃO ADMISSÍVEL = 90% DA TENSÃO DE ESCOAMENTO

D

AF

G.1

G.2

G.5

G.7

G.8

01

3/16”

UNC

4,725

11,260

0,244

0,386

0,624

0,780

0,882

02

3/16”

UNF

4,725

12,817

0,278

0,439

0,711

0,888

1,004

03

1/4”

UNC

6,350

20,486

0,592

0,936

1,515

1,892

2,140

04

1/4”

UNF

6,350

23,351

0,675

1,067

1,727

2,157

2,439

05

5/16”

UNC

7,9375

33,766

1,221

1,930

3,122

3,898

4,409

06

5/16”

UNF

7,9375

37,315

1,349

2,133

3,450

4,308

4,873

07

3/8”

UNC

9,525

49,943

2,167

3,427

5,543

6,919

7,826

08

3/8”

UNF

9,525

56,474

2,451

3,875

6,268

7,823

8,850

09

7/16”

UNC

11,1125

68,590

3,470

5,486

8,874

11,086

12,540

10

7/16”

UNF

11,1125

76,379

3,864

6,109

9,882

12,344

13,964

11

1/2”

UNC

12,7

91,544

5,294

8,370

13,539

16,909

19,127

12

1/2”

UNF

12,7

102,937

6,792

10,739

17,371

19,013

21,508

13

1/2”

BSW

12,7

88,764

5,133

8,116

13,128

16,395

18,546

14

9/16”

UNC

14,2875

117,449

7,638

12,075

19,532

24,406

27,607

15

9/16”

UNF

14,2875

130,671

8,497

13,435

21,731

27,153

30,715

16

5/8”

UNC

15,875

145,994

10,558

16,692

27,000

33,708

38,130

17

5/8”

UNF

15,875

164,786

11,917

18,841

30,475

38,047

43,038

18

3/4”

UNC

19,05

215,981

18,737

29,624

47,916

59,840

67,691

19

3/4

UNF

19,05

240,264

20,843

32,954

53,304

66,568

75,301

20

7/8”

UNC

22,22

298,064

30,16098

47,68542

77,1311

96,3240

108,9608

21

7/8”

UNF

22,22

328,386

33,2289

52,53642

84,9776

106,123

120,0457

22

1”

UNC

25,40

390,966

45,76545

71,49942

115,651

144,4297

163,3766

23

1”

UNF

25,40

427,741

49,47696

78,22512

126,5289

158,0147

178,7444

24

1.1/8”

UNC

28,57

492,257

64,04643

101,2589

163,7864

204,5431

231,3768

25

1.1/8”

UNF

28,57

552,257

71,85276

113,6013

183,7503

229,4747

259,5793

26

1.1/4”

UNC

31,75

625,160

90,39132

142,9115

231,1592

288,6812

326,5524

27

1.1/4”

UNF

31,75

692,257

100,093

158,2496

255,9694

319,6646

361,6003

28

1.1/2”

UNC

38,10

906,449

157,2748

248,6566

402,2029

502,2867

568,1804

29

1.1/2”

UNF

38,10

1019,998

176,9768

279,8056

452,5857

565,207

639,3556

TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE POLEGADA

ITEM

BITOLA

TENSÃO ADMISSÍVEL = TENSÃO DE ESCOAMENTO

D

AF

G.1

G.2

G.5

G.7

G.8

01

3/16”

UNC

4,725

11,260

0,271

0,429

0,694

0,867

0,980

02

3/16”

UNF

4,725

12,817

0,309

0,488

0,790

0,986

1,116

03

1/4”

UNC

6,350

20,486

0,658

1,041

1,683

2,102

2,378

04

1/4”

UNF

6,350

23,351

0,750

1,186

1,919

2,396

2,711

05

5/16”

UNC

7,9375

33,766

1,356

2,144

3,468

4,331

4,900

06

5/16”

UNF

7,9375

37,315

1,499

2,370

3,833

4,786

5,414

07

3/8”

UNC

9,525

49,943

2,407

3,806

6,156

7,687

8,696

08

3/8”

UNF

9,525

56,474

2,719

4,303

6,961

8,693

9,833

09

7/16”

UNC

11,1125

68,590

3,857

6,098

9,863

12,317

13,933

10

7/16”

UNF

11,1125

76,379

4,295

6,790

10,983

13,716

15,515

11

1/2”

UNC

12,7

91,544

5,883

9,301

15,044

18,788

21,252

12

1/2”

UNF

12,7

102,937

6,615

10,485

16,916

21,126

23,897

13

1/2”

BSW

12,7

88,764

5,704

9,018

14,587

18,217

20,607

14

9/16”

UNC

14,2875

117,449

8,491

13,424

21,714

27,117

30,675

15

9/16”

UNF

14,2875

130,671

9,447

14,936

24,158

30,170

34,128

16

5/8”

UNC

15,875

145,994

11,727

18,541

29,990

37,453

42,367

17

5/8”

UNF

15,875

164,786

13,237

20,928

33,851

42,274

47,820

18

3/4”

UNC

19,05

215,981

20,819

32,916

53,241

66,489

75,212

19

3/4

UNF

19,05

240,264

23,160

36,616

59,227

73,965

83,668

20

7/8”

UNC

22,22

298,064

33,5122

52,9838

85,7013

107,0267

121,0676

21

7/8”

UNF

22,22

328,386

36,9210

58,3738

94,4196

117,9144

133,3841

22

1”

UNC

25,40

390,966

50,8505

79,4438

128,5011

160,4774

181,5295

23

1”

UNF

25,40

427,741

54,9744

86,9168

140,5877

175,5719

198,6049

24

1.1/8”

UNC

28,57

492,257

71,1627

112,5099

181,9849

227,2701

257,0853

25

1.1/8”

UNF

28,57

552,257

79,8364

126,2237

204,167

254,9719

288,4214

26

1.1/4”

UNC

31,75

625,160

100,4348

158,7906

256,8436

320,7569

362,836

27

1.1/4”

UNF

31,75

692,257

111,2144

175,8329

284,4104

355,1829

401,7781

28

1.1/2”

UNC

38,10

906,449

174,7498

276,2851

446,8921

558,0963

631,3116

29

1.1/2”

UNF

38,10

1019,998

196,6409

310,8951

502,873

628,0078

710,3951

TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE POLEGADA

ITEM

BITOLA

TENSÃO ADMISSÍVEL = 80% DA TENSÃO DE RUPTURA (T.R.)

TENSÃO ADM. = 90% DA T. RUPTURA

D

AF

G.1

G.2

G.5

G.7

G.8

01

3/16”

UNC

4,725

11,260

0,360

0,446

0,721

0,903

1,017

02

3/16”

UNF

4,725

12,817

0,410

0,508

0,820

1,027

1,158

03

1/4”

UNC

6,350

20,486

0,874

1,082

1,748

2,189

2,468

04

1/4”

UNF

6,350

23,351

0,996

1,234

1,993

2,496

2,813

05

5/16”

UNC

7,9375

33,766

1,801

2,230

3,602

4,511

5,085

06

5/16”

UNF

7,9375

37,315

1,990

2,464

3,981

4,985

5,619

07

3/8”

UNC

9,525

49,943

3,197

3,958

6,394

8,006

9,025

08

3/8”

UNF

9,525

56,474

3,615

4,475

7,230

9,053

10,205

09

7/16”

UNC

11,1125

68,590

5,122

6,342

10,244

12,828

14,461

10

7/16”

UNF

11,1125

76,379

5,704

7,062

11,407

14,285

16,103

11

1/2”

UNC

12,7

91,544

7,813

9,673

15,625

19,567

22,057

12

1/2”

UNF

12,7

102,937

8,785

10,877

17,579

22,002

24,802

13

1/2”

BSW

12,7

88,764

7,575

9,379

15,151

18,973

21,387

14

9/16”

UNC

14,2875

117,449

11,277

13,961

22,553

28,242

31,836

15

9/16”

UNF

14,2875

130,671

12,546

15,533

25,092

31,421

35,420

16

5/8”

UNC

15,875

145,994

15,575

19,283

31,149

39,006

43,971

17

5/8”

UNF

15,875

164,786

17,579

21,765

35,159

44,027

49,630

18

3/4”

UNC

19,05

215,981

27,649

34,232

55,298

69,246

78,059

19

3/4

UNF

19,05

240,264

30,758

38,081

61,515

77,031

86,835

20

7/8”

UNC

17,776

238,4512

44,5064

55,1032

89,0128

111,4641

125,6508

21

7/8”

UNF

17,776

262,7088

49,0336

60,7088

98,068

122,8032

138,4335

22

1”

UNC

20,32

312,7728

67,5328

82,6216

133,4664

167,1309

188,4015

23

1”

UNF

20,32

342,1928

73,0096

90,3936

146,02

182,8512

206,1234

24

1.1/8”

UNC

22,856

393,8056

94,5088

117,0104

189,0168

236,6928

266,8176

25

1.1/8”

UNF

22,856

441,8056

106,028

131,2728

212,056

265,5432

299,34

26

1.1/4”

UNC

25,4

500,128

133,384

165,1424

266,768

334,0557

376,5717

27

1.1/4”

UNF

25,4

553,8056

147,7

182,8664

295,4

369,909

416,988

28

1.1/2”

UNC

30,48

725,1592

232,0792

287,3368

464,16

581,2353

655,2108

29

1.1/2”

UNF

30,48

815,9984

261,152

323,3312

522,304

654,0453

737,2881

TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE POLEGADA

ITEM

BITOLA

TENSÃO ADMISSÍVEL = TENSÃO DE RUPTURA

D

AF

G.1

G.2

G.5

G.7

G.8

01

3/16”

UNC

4,725

11,260

0,450

0,558

0,901

1,003

1,130

02

3/16”

UNF

4,725

12,817

0,513

0,635

1,025

1,141

1,287

03

1/4”

UNC

6,350

20,486

1,093

1,353

2,185

2,433

2,742

04

1/4”

UNF

6,350

23,351

1,246

1,542

2,491

2,773

3,126

05

5/16”

UNC

7,9375

33,766

2,251

2,787

4,503

5,012

5,650

06

5/16”

UNF

7,9375

37,315

2,488

3,080

4,976

5,539

6,244

07

3/8”

UNC

9,525

49,943

3,996

4,947

7,992

8,896

10,028

08

3/8”

UNF

9,525

56,474

4,518

5,594

9,037

10,059

11,339

09

7/16”

UNC

11,1125

68,590

6,403

7,927

12,805

14,253

16,067

10

7/16”

UNF

11,1125

76,379

7,130

8,827

14,259

15,872

17,892

11

1/2”

UNC

12,7

91,544

9,766

12,487

19,532

21,741

24,508

12

1/2”

UNF

12,7

102,937

10,981

13,603

21,963

24,447

27,558

13

1/2”

BSW

12,7

88,764

9,469

11,724

18,939

21,081

23,764

14

9/16”

UNC

14,2875

117,449

14,096

17,452

28,191

31,380

35,373

15

9/16”

UNF

14,2875

130,671

15,682

19,164

31,365

34,912

39,356

16

5/8”

UNC

15,875

145,994

19,468

24,104

38,937

43,340

48,856

17

5/8”

UNF

15,875

164,786

21,974

27,206

43,948

48,919

55,145

18

3/4”

UNC

19,05

215,981

34,561

42,790

69,123

76,340

86,732

19

3/4

UNF

19,05

240,264

38,447

47,601

76,894

85,590

96,484

20

7/8”

UNC

22,22

298,064

55,633

68,879

111,266

123,849

139,612

21

7/8”

UNF

22,22

328,386

61,292

75,886

122,585

136,448

153,815

22

1”

UNC

25,40

390,966

84,416

103,277

166,833

185,701

209,335

23

1”

UNF

25,40

427,741

91,262

112,992

182,525

203,168

229,026

24

1.1/8”

UNC

28,57

492,257

118,136

146,263

236,271

262,992

296,464

25

1.1/8”

UNF

28,57

552,257

132,535

164,091

265,070

295,048

332,600

26

1.1/4”

UNC

31,75

625,160

166,730

206,428

333,460

371,173

418,413

27

1.1/4”

UNF

31,75

692,257

184,625

228,583

369,250

411,010

463,320

28

1.1/2”

UNC

38,10

906,449

290,099

359,171

580,200

645,817

728,012

29

1.1/2”

UNF

38,10

1019,998

326,440

404,164

652,880

726,717

819,209

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