MACHANICAL PROPERTIES OF BOLTS, SCREWS AND STUDS

Mechanical Properties

 

4.6

4.8

5.6

5.8

6.8

< M16

>  M16

9.8

10.9

12.9

Tensile Strength,R/M N/mm2

Nom

400

400

500

500

600

800

800

900

1000

1200

Min

400

420

500

520

600

800

830

900

1040

1220

Vickers hardened HV

Min

120

130

155

160

190

230

255

280

310

372

Max

220

220

220

220

250

300

336

360

382

434

Brinell hardness, F-30D2 HB

Min

114

124

147

152

181

219

242

266

295

353

Max

209

209

209

209

238

285

319

342

362

412

Min

HR

67

71

79

82

89

--

--

--

--

--

Roxkwell hardness HR

HRC

--

--

--

--

--

20

23

27

31

38

Max

HRB

95

95

95

95

99

--

--

--

--

--

 

HRC

--

--

--

--

--

30

34

36

39

44

surface hardness,HV Max

--

--

--

--

--

--

320

356

380

402

454

Yield Stress, Rel,N/mm2

NOM

240

320

300

400

480

--

--

--

--

--

Min

240

340

300

420

480

--

--

--

--

--

Stress at perman set N/mm2 limit,R

Nom

--

--

--

--

--

640

640

720

900

1080

Min

--

--

--

--

--

640

660

720

940

1100

Stress under proof load,S

Sp/Rel

0.94

0.91

0.94

0.91

0.91

0.91

0.91

0.91

0.88

0.88

N/mm2

225

310

280

380

440

580

600

650

830

970

Elongation after fracture A%

Min

22

14

20

10

8

12

12

10

9

8

Strength under wedge loadin

The values for full size bolts and screws (not studs) should equals the minimum values for

tensile strength shown in 4.2

Impact strength

Min

--

25

--

30

30

25

20

15

Head soundness

 

No fracture

Minimum height on non decarburized thread zone ,E

--

1/2H1                                      2/3H1

3/4H1

 

Maximum depth of complete decarburization, G

mm

0.015

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