TORQUE-TENSION REFERENCE GUIDE - Fastenal

[Pages:1]TORQUE-TENSION REFERENCE GUIDE

ASTM A307 GRADE A, SAE J429 GRADE 5 & 8, HOLO-KROME GRADE 9

ASTM A574 SOCKET HEAD CAP SCREWS

Nominal Dia. Threads per

(in.)

inch

307A

Clamp Load (Lbs.)

ASTM A307 Grade A Tightening Torque

K = 0.15

K = 0.20

1/4

20

859

32 in-lbs 43 in-lbs

5/16

18

1416

66

88

3/8

16

2092

10 ft-lbs 13 ft-lbs

7/16

14

2870

16

21

1/2

13

3831

24

32

9/16

12

4912

35

46

5/8

11

6102

48

64

3/4

10

9030

85

113

7/8

9

12467

136

182

1

8

16355

204

273

1-1/4

7

26166

409

545

1-3/8

6

31182

536

715

1-1/2

6

37942

711

949

1/4

28

5/16

24

3/8

24

7/16

20

1/2

20

9/16

18

5/8

18

3/4

16

7/8

14

1

14

1-1/4

12

1-3/8

12

1-1/2

12

Clamp Load (Lbs.)

2029 3342 4940 6777 9046 11599 14408 21322 29436 38616 53786 64096 77991

2319 3702 5599 7568 10197 12940 16317 23776 32479 43343 59548 72967 87747

SAE J429 Grade 5

Tightening Torque

EcoguardTM

K = 0.15

K = 0.20

Unified Coarse Thread Series

66 in-lbs 76 in-lbs 10 1in-lbs

136

157

209

20 ft-lbs 23 ft-lbs 31 ft-lbs

32

37

49

49

57

75

71

82

109

98

113

150

173

200

267

279

322

429

418

483

644

728

840

1121

955

1102

1469

1267

1462

1950

Fine Thread Series

75 in-lbs 87 in-lbs 116 in-lbs

150

174

231

23 ft-lbs 26 ft-lbs 35 ft-lbs

36

41

55

55

64

85

79

91

121

110

127

170

193

223

297

308

355

474

470

542

722

806

930

1241

1087

1254

1672

1426

1645

2194

Clamp Load (Lbs.)

SAE J429 Grade 8 Tightening Torque

EcoguardTM

K = 0.15

K = 0.20

HK

G9

Clamp Load (Lbs.)

Holo-Krome Grade 9

Tightening Torque

EcoguardTM

2864 4719 6974 9568 12771 16375 20340 30101 41556 54517 87220 103939 126473

3274 5226 7905 10684 14396 18268 23036 33566 45853 61190 96565 118324 142292

93 in-lbs 192

28 ft-lbs 45 69 100 138 245 394 591 1181 1548 2055

107 in-lbs 221

33 ft-lbs 52 80 115 159 282 455 681 1363 1786 2371

143 in-lbs 295

44 ft-lbs 70 106 154 212 376 606 909 1817 2382 3162

106 in-lbs 212

32 ft-lbs 51 78 111 156 273 435 663 1308 1763 2312

123 in-lbs 245

37 ft-lbs 58 90 128 180 315 502 765 1509 2034 2668

164 in-lbs 327

49 ft-lbs 78 120 171 240 420 669 1020 2012 2712 3557

3357 5531 8174 11214 14969 19193 23840 35281 48707 63899 102229 121826 148237

3837 6125 9265 12523 16873 21412 27000 39343 53743 71720 113182 138686 166778

109 in-lbs 225

33 ft-lbs 53 81 117 161 287 462 692 1384 1815 2224

125 in-lbs 249

38 ft-lbs 59 91 130 183 320 509 777 1533 2066 2710

ISO 898-1 METRIC FASTENERS

Nominal Dia. (mm)

Pitch

4

0.7

5

0.8

6

1

7

1

8

1.25

10

1.5

12

1.75

14

2

16

2

18

2.5

20

2.5

22

2.5

24

3

27

3

30

3.5

33

3.5

36

4

Clamp Load (lbs) 333 538 763 1095 1389 2200 3197 4379 5943 7301 9286 11509 13372 17428 21266 26310 30982

4.6 Class 4.6

Tightening Torque

K = 0.15 K = 0.20

8 in-lbs 16 27 45 66

10.8 ft-bs 18.9 30.2 47 65 91 125 158 232 314 427 549

10 in-lbs 21 36 60 87

14.4 ft-lbs 25.2 40.2 62 86 122 166 211 309 419 570 732

Clamp Load (lbs) 858 1387 1968 2822 3580 5671 8240 11289 15320 19471 24763 30692 35659 46474 56709 70160 82620

8.8 Class 8.8

Tightening Torque

Ecoguard K = 0.15 K = 0.20

18 in-lbs 35 60 101 147

24.2 ft-lbs 42.2 67.4 105 149 211 288 365 535 726 987 1269

20 in-lbs 41 70 117 169

27.9 ft-lbs 48.7 77.8 121 172 244 332 421 618 837 1139 1464

27 in-lbs 55 93 156 226

37.2 ft-lbs 64.9 103.7 161 230 325 443 562 823 1116 1519 1952

Clamp Load (lbs) 1228 1985 2816 4039 5123 8115 11792 16154 21924 26934 34256 42457 49329 64288 78448 97055 114291

10.9 Class 10.9

Tightening Torque

Ecoguard K = 0.15 K = 0.20

25 in-lbs 51 86 145 210

34.6 ft-lbs 60.4 96.5 150 207 292 398 505 740 1004 1366 1755

29 in-lbs 59 100 167 242

39.9 ft-lbs 69.6 111.3 173 239 337 460 583 854 1158 1576 2025

39 in-lbs 78 133 223 323

53.2 ft-lbs 92.9 148.4 230 318 450 613 777 1139 1544 2102 2700

Clamp Load (lbs) 1436 2319 3291 4720 5987 9484 13781 18879 25622 31477 40034 49619 57649 75132 91680 113425 133569

12.9 Class 12.9

Tightening Torque

Ecoguard K = 0.15 K = 0.20

29 in-lbs 59 101 169 245

40.4 ft-lbs 70.5 112.7 175 242 341 466 590 865 1173 1596 2051

34 in-lbs 68 117 195 283

46.7 ft-lbs 81.4 130.1 202 279 394 537 681 998 1354 1842 2366

45 in-lbs 91 155 260 377

62.2 ft-lbs 108.5 173.4 269 372 525 716 908 1331 1805 2456 3155

Nominal Dia.

2 4 6

8

10 12 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1 1/4 1 1/2

Basic Screw

Dia.

0.0860 0.1120 0.1380

0.1640

0.1900 0.2160 0.2500 0.3125 0.3750 0.4375 0.500 0.563 0.625 0.750 0.875 1.000 1.250 1.500

Unified Coarse Thread Series

Threads per Inch

Clamp Load (lbs)

Tightening Torque

Ecoquard

Threads K = 0.15 K = 0.20 per Inch

56

388

5 in-lbs 7 in-lbs 64

40

633

11

14

48

32

954

20

26

40

32

1471

31 inlbs

36

48

36

24 1841 45

52

70

32

24 2537 71

82

110

28

20 3341 9 ft-lbs 10 ft-lbs 14 ft-lbs 28

18 5505 19

22

29

24

16 8136 33

38

51

24

14 11162 53

61

81

20

13 14899 81

93

124

20

12 18422 112 130 173

18

11 22883 155 179 238

18

10 33864 275 317 423

16

9 46751 443 511 682

14

8 61332 664 767 1022 14

7 98123 1329 1533 2044 12

6 142282 2312 2668 3557 12

Fine Thread Series

Clamp Load (lbs)

Tightening Torque

Ecoguard

K = 0.15 K = 0.20

413

5 in-lbs 7 in-lbs

693

12

16

1065

22

29

1546

33 inlbs

38

51

2099 52

60

80

2708 76

88

117

3819 10 ft-lbs 12 ft-lbs 16 ft-lbs

6097 21

24

32

9222 37

43

58

12465 59

68

91

16795 91

105

140

20552 125 145 193

25916 175 202 270

37762 307 354 472

51584 489 564 752

68839 746 860 1147

108636 1471 1697 2263

160079 2601 3001 4002

ASTM A193/A193M B7 AND B16 & A320/A320M L7 BOLTS AND STUDS

Nominal Dia. (in)

1/4

5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1 1/4 1 3/8 1 1/2

1 1/4 1 3/8 1 1/2 1 5/8 1 3/4 1 7/8

2 2 1/4 2 1/2

Threads per inch

Clamp Load (lbs)

Tightening Torque K=0.12 K = 0.15 K = 0.20

Coarse Thread Series

20

2506

75 in-lbs 94 in-lbs

125 inlbs

18

4129

155

194

258

16

6102 23 ft-lbs 29 ft-lbs 38 ft-lbs

14

8372

37

46

61

13

11175

56

70

93

12

14328

81

101

134

11

17798 111

139

185

10

26339 198

247

329

9

36362 318

398

530

8

47702 477

596

795

7

76318 954

1192 1590

6

90947 1251 1563 2084

6

110664 1660

2075 2767

UN8 Thread Series

8

78727

984

1230

1640

8

97138 1336 1670 2226

8

117483 1762 2203 2937

8

139760 2271 2839 3785

8

163970 2869 3587 4782

8

190112 3565 4456 5941

8

218188 4364 5455 7273

8

280138 6303 7879 10505

8

349819 8745 10932 14576

Threads per Inch

28

24 24 20 20 18 18 16 14 14 12 12 12

Clamp Load (lbs)

Tightening Torque K=0.12 K=0.15 K=0.20

Fine Thread Series

2864

86 in-lbs

107 inlbs

143 inlbs

4573

171

214

286

6916 26 ft-lbs 32 ft-lbs 43 ft-lbs

9349

41

51

68

12596

63

79

105

15985

90

112

150

20157 126

157

210

29371 220

275

367

40121 351

439

585

53541 535

669

892

84494 1056 1320 1760

103534 1424 1779 2373

124506 1868 2334 3113

? If using API bolting requirements, refer to applicable API specification for tightening torque values. ? These recommendations are for non-gasketed metal-to-metal joints.

ASTM F593 STAINLESS STEEL HEX CAP SCREW & ASTM F837 SOCKET HEAD CAP SCREW

A2-70 OR A4-70 METRIC STAINLESS STEEL FASTENERS

Nominal Dia. (mm)

Pitch

3

0.5

4

0.7

5

0.8

6

1

8

1.25

10

1.5

12

1.75

14

2

16

2

18

2.5

20

2.5

22

2.5

24

3

27

3

30

3.5

33

3.5

36

4

Lubricated Clamp Load

(N) 1698 2963 4787 6792 12355 19571 28440 38961 52876 64960 82618 102397 118970 155050 189198 234075 275644

Lubricated Clamp Load

(lbs) 382 666 1076 1527 2777 4400 6393 8758 11886 14603 18573 23019 26744 34855 42532 52620 61965

Tightening Torque

Lubricated K=0.16

(Nm)

US Units

(Nm)

0.81

7.2 in-lbs

0.95

1.90

16.8

2.21

3.83

33.9

4.47

6.52

57.7

7.61

15.8

140.0

18.5

31.3

23.1 ft-lbs

36.5

54.6

40.3

63.7

87.3

64.4

102

135

99.9

158

187

138

218

264

195

308

360

266

421

457

337

533

670

494

781

908

670

1060

1236

912

1442

1588

1172

1852

Dry K = 0.35 US Units 8.4 in-lbs 19.6 39.5 67.3 163.3 27.0 ft-lbs 47.0 75.1 116.5 161 228 310 393 577 782 1064 1367

Dry Clamp Load

(N) 906 1580 2553 3622 6590 10438 15168 20779 28200 34645 44063 54612 63451 82693 100906 124840 147010

Dry Clamp Load

(lbs) 204 355 574 814 1481 2346 3410 4671 6339 7788 9905 12277 14264 18589 22684 28064 33048

CAUTION: All material included in these charts is advisory only, and its use by anyone is voluntary. In developing this information, Fastenal has made a determined effort to present its contents accurately. Extreme caution should be used when using a formula for torque/tension relationships. Torque is only an indirect indication of tension. Under/over tightening of fasteners can result in costly equipment failure or personal injury.

NOTES: 1) The torque values can only be achieved if nut or tapped hole has a proof load greater than or equal to the bolt's minimum tensile strength.

2) For A307A, J429 Grade 5 and 8, H-K Grade 9, EcoGuardTM, A574, A193 B7, Class 4.6, 8.8, 10.9, and 12.9 externally thread fasteners and the torque values were calculated from the formula Torque=KDF, where K is the estimated torque coefficient (for full details contact engineer@). K = 0.13 when using EcoGuardTM coated nut, bolt and washer K = 0.15 for "lubricated" conditions including EcoGuardTM, some oil, tapping fluid, etc. K = 0.20 for zinc and dry conditions K = 0.12 is listed for A193 B7, which would be used for some general PTFE coatings When using zinc plated lubricated with wax prevailing torque lock nuts, the K value can vary between 0.12?0.18. D = Nominal Diameter F = Clamp Load For J429 Grade 5 and 8, H-K Grade 9, A574, Class 4.6, 8.8, 10.9 and 12.9, the clamp loads are listed at 75% of the proof loads specified by the standard. For A307 Grade A, 75% of 36,000 PSI is utilized. A193 B7 uses 75% of the yield strength.

4) Stainless Steel and Non-Ferrous are suggested maximum torque values based on actual lab testing.

5) Stainless steel fasteners tend to gall while being tightened. The risk of galling or thread seizing can be reduced by: using lubrication, tightening fasteners with low RPMs and without interruptions, applying only light pressure, and avoiding prevailing torque lock nuts when possible.

CONVERSION FACTORS: To convert inch-pounds (in-lbs) to Newton meters (Nm), multiply by 0.113 To convert foot-pounds (ft-lbs) to Newton meters (Nm), multiply by 1.35 To convert pounds (lbs) to Newtons (N), multiply by 4.448 To convert inches (in) to millimeters (mm), multiply by 25.4

Note: When using Zinc Plated (lubricated with wax) Top Lock Nuts, the K value can vary between 0.12-0.16.

3) Alloy Steel Socket Shoulder and Alloy Steel Low Head Socket Head Cap Screw, torque values for inch series charts up through and including 5/16-in diameter are in inch-pounds; diameters 3/8-in and larger are in foot-lbs. Torque values for metric fasteners up through and including M8 are in inch-pounds; diameters M10 and larger are in foot-lbs.

Nom Dia. (in.) or Nominal Size

2 4 6 8 10 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1 1/8 1 1/4 1 3/8 1 1/2

2 4 6 8 10 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1 1/8 1 1/4 1 3/8 1 1/2

Threads per inch

56 40 32 32 24 20 18 16 14 13 12 11 10 9 8 7 7 6 6

64 48 40 36 32 28 24 24 20 20 18 18 16 14 14 12 12 12 12

ASTM F593 Cold Worked

ASTM F837 Cold Worked

Lubricated Tightening Torque

Clamp Lubricated Dry Load (lbs) K=0.16 K=0.35

Dry Clamp Load (lbs)

Lubricated Clamp

Load (lbs)

Tightening Torque

Lubricated Dry K=0.16 K=0.35

Dry Clamp Load (lbs)

Coarse Thread Series

111 1.5 in-lbs 1.8 in-lbs 59

181

3.2

3.8

97

273

6

7

145

420

11

13

224

526

16

19

281

1551 62 in-lbs 72 in-lbs 827

955

38

45

509

2556

128

149

1363

1573

79

92

839

3778 19 ft-lbs 22 ft-lbs 2015

2325 12 ft-lbs 14 ft-lbs 1240

5183

30

35

2764

3189

19

22

1701

6918

46

54

3689

4257

28

33

2270

8870

67

78

4731

5458

41

48

2911

11018

92

107

5876

6780

57

66

3616

11288

113

132

6020

10034

100

117

5351

15584

182

212

8311

12121

141

165

6464

20444

273

318

10903 15901

212

247

8480

25761

386

451

13739 20036

301

351

10686

32708

545

636

17444 25439

424

495

13568

38977

715

834

20788 30316

556

648

16168

47427

949

1107

25295 36888

738

861

19674

Fine Thread Series

118 1.6 in-lbs 1.9 in-lbs 63

198

3.6

4.1

106

304

7

8

162

442

12

14

236

600

18

21

320

1773 71 in-lbs 83 in-lbs 946

1091

44

51

582

2831

142

165

1510

1742

87

102

929

4282 21 ft-lbs 25 ft-lbs 2284

2635 13 ft-lbs 15 ft-lbs 1405

5787

34

39

3087

3561

21

24

1899

7798

52

61

4159

4799

32

37

2559

9895

74

87

5277

6089

46

53

3248

12478

104

121

6655

7679

64

75

4095

12587

126

147

6713

11189

112

131

5967

17195

201

234

9171 133737 1560

182

7133

22946

306

357

12238 178470 2380

278

9518

28881

433

505

15403 224627 3369

393

11980

36212

604

704

19313 281648 4694

548

15021

44372

813

949

23665 345112 6327

738

18406

53360

1067

1245

28458 415019 8300

968

22134

Printed in U.S.A. ? Supply Part Number: 9702365 ? JP 05/19 Torque Poster

For additional technical information, contact Fastenal Engineering at engineer@.

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