ISO 898-1

Property class	Material and heat treatment	Chemical composition lⁱmit (cast analysis, %) ^a					Tempering temperature °C min.
		C		P max.	S max.	B^b max.
		min.	max.	P max.	S max.	B^b max.
4.6 ^{c d}	Carbon steel or carbon steel with additives	–	0,55	0,050	0,060	Not specified	–
4.8 ^d		–	0,55	0,050	0,060
5.6 ^c		0,13	0,55	0,050	0,060
5.8 ^d		–	0,55	0,050	0,060
6.8 ^d		0,15	0,55	0,050	0,060
8.8 ^f	Carbon steel with additives (e.g. Boron or Mn or Cr) quenched and tempered	0,15e	0,40	0,025	0,025	0,003	425
	Carbon steel quenched and tempered	0,25	0,55	0,025	0,025
	Alloy steel quenched and tempered^g	0,20	0,55	0,025	0,025
9.8 ^f	Carbon steel with additives (e.g. Boron or Mn or Cr) quenched and tempered	0,15 ^e	0,40	0,025	0,025	0,003	425
	Carbon steel quenched and tempered	0,25	0,55	0,025	0,025
	Alloy steel quenched and tempered^g	0,20	0,55	0,025	0,025
10.9 ^f	Carbon steel with additives (e.g. Boron or Mn or Cr) quenched and tempered	0,20 ^e	0,55	0,025	0,025	0,003	425
	Carbon steel quenched and tempered	0,25	0,55	0,025	0,025
	Alloy steel quenched and tempered^g	0,20	0,55	0,025	0,025
12.9 ^{f h i}	Alloy steel quenched and tempered^g	0,30	0,50	0,025	0,025	0,003	425
12.9 ^{f h i}	Carbon steel with additives (e.g. Boron or Mn or Cr or Molybdenum) quenched and tempered	0,28	0,50	0,025	0,025	0,003	380
a In case of dispute, the product analysis applies. b Boron content can reach 0,005 %, provided non-effective boron is controlled by the addition of titanium and/or aluminium. c For cold forged fasteners of property classes 4.6 and 5.6, heat treatment of the wire used for cold forging or of the cold forged fastener itself may be necessary to achieve required ductility. d Free cutting steel is allowed for these property classes with the following maximum sulfur, phosphorus and lead contents: S: 0,34 %; P: 0,11 %; Pb: 0,35 %. e In case of plain carbon boron steel with a carbon content below 0,25 % (cast analysis), the minimum manganese content shall be 0,6 % for property class 8.8 and 0,7 % for property classes 9.8 and 10.9. f For the materials of these property classes, there shall be a sufficient hardenability to ensure a structure consisting of approximately 90 % martensite in the core of the threaded sections for the fasteners in the “as-hardened” condition before tempering. g This alloy steel shall contain at least one of the following elements in the minimum quantity given: chromium 0,30 %, nickel 0,30 %, molybdenum 0,20 %, vanadium 0,10 %. Where elements are specified in combinations of two, three or four and have alloy contents less than those given above, the limit value to be applied for steel class determination is 70 % of the sum of the individual limit values specified above for the two, three or four elements concerned. h Fasteners manufactured from phosphated raw material shall be dephosphated before heat treatment; the absence of white phosphorus enriched layer shall be detected by a suitable test method. i Caution is advised when the use of property class 12.9/12.9 is considered. The capability of the fastener manufacturer, the service conditions and the wrenching methods should be considered. Environments can cause stress corrosion cracking of fasteners as processed as well as those coated

Mechanical or physical property	Property class
Tensile strength, R_m, MPa	nom.^c	400	500	600	800	900	1000	1200
min.	400	420	500	520	600	800	830	900	1040	1220
Lower yield strength, R_eL^d, MPa	nom.^c	240	–	300	–	–	–	–	–	–	–
min.	240	–	300	–	–	–	–	–	–	–
Stress at 0,2 % non-proportional elongation, R_p0,2, MPa	nom.^c	–	–	–	–	–	640	640	720	900	1080
min.	–	–	–	–	–	640	660	720	940	1100
Stress at 0,0048d non-proportional elongation for full-size fasteners, R_pf, MPa	nom.^c	–	320	–	400	480	–	–	–	–	–
min.	–	340 ^e	–	420 ^e	480 ^e	–	–	–	–	–
Stress under proof load, S_p^f, MPa	nom.	225	310	280	380	440	580	600	650	830	970
Proof strength ratio S_p,nom/R_eL,min or S_p,nom/R_{p0,2 min}or S_p,nom/R_pf,min	0,94	0,91	0,93	0,90	0,92	0,91	0,91	0,90	0,88	0,88
Percentage elongation after fracture for machined test pieces, A, %	min.	22	–	20	–	–	12	12	10	9	8
Percentage reduction of area after fracture for machined test pieces, Z, %	min.	–	52	48	48	44
Elongation after fracture for full-size fasteners, A_f (see also Annex C)	min.	–	0,24	–	0,22	0,20	–	–	–	–	–
Head soundness	No fracture
Vickers hardness, HV F ≥ 98 N	min.	120	130	155	160	190	250	255	290	320	385
max.	220 ^g	250	320	335	360	380	435
Brinell hardness, HBW F = 30 D²	min.	114	124	147	152	181	245	250	286	316	380
max.	209 ^g	238	316	331	355	375	429
Rockwell hardness, HRB	min.	67	71	79	82	89	–
max.	95,0 ^g	99,5	–
Rockwell hardness, HRC	min.	–	22	23	28	32	39
max.	–	32	34	37	39	44
Surface hardness, HV 0,3	max.	–	–	390	435
Non-carburization, HV 0,3	max.	–	^h	^h	^h
Height of non-decarburized thread zone, E, mm	min.	–	1/2 H₁	2/3 H₁	3/4 H₁
Depth of complete decarburization in the thread, G, mm	max.	–	15
Reduction of hardness after retempering, HV	max.	–	20
Breaking torque, M_B, Nm	min.	–	in accordance with ISO 898-7
Impact strength, K_V ^{i j}, J	min.	–	27	–	27	27	27	27	^k
Surface integrity in accordance with	ISO 6157-1^l	ISO 6157-3
a Values do not apply to structural bolting. b For structural bolting d ≥ M12. c Nominal values are specified only for the purpose of the designation system for property classes. See Clause 5. d In cases where the lower yield strength, ReL, cannot be determined, it is permissible to measure the stress at 0,2 % nonproportional elongation Rp0,2. e For the property classes 4.8, 5.8 and 6.8, the values for Rpf,min are under investigation. The values at the time of publication of this part of ISO 898 are given for calculation of the proof stress ratio only. They are not test values. f Proof loads are specified in Tables 5 and 7. g Hardness determined at the end of a fastener shall be 250 HV, 238 HB or 99,5 HRB maximum. h Surface hardness shall not be more than 30 Vickers points above the measured base metal hardness of the fastener when determination of both surface hardness and base metal hardness are carried out with HV 0,3 (see 9.11). i Values are determined at a test temperature of −20 °C (see 9.14). j Applies to d ≥ 16 mm. k Value for KV is under investigation. l Instead of ISO 6157-1, ISO 6157-3 may apply by agreement between the manufacturer and the purchaser.

Mechanical or physical property

Property class

4.6

4.8

5.6

5.8

6.8

8.8

9.8 d ≤ 16 mm

10.9

12.9/ 12.9

d ≤16 mm ^a

d > 16 mm ^b

Tensile strength, R_m, MPa

nom.^c

400

500

600

800

900

1000

1200

min.

400

420

500

520

600

800

830

900

1040

1220

Lower yield strength, R_eL^d, MPa

nom.^c

240

–

300

–

min.

240

–

300

–

Stress at 0,2 % non-proportional elongation, R_p0,2, MPa

nom.^c

–

640

720

900

1080

min.

–

640

660

720

940

1100

Stress at 0,0048d non-proportional elongation for full-size fasteners, R_pf, MPa

nom.^c

–

320

–

400

480

–

min.

–

340 ^e

–

420 ^e

480 ^e

–

Stress under proof load, S_p^f, MPa

nom.

225

310

280

380

440

580

600

650

830

970

Proof strength ratio
S_p,nom/R_eL,min
or S_p,nom/R_{p0,2 min}or
S_p,nom/R_pf,min

0,94

0,91

0,93

0,90

0,92

0,91

0,90

0,88

Percentage elongation after fracture for machined test pieces, A, %

min.

–

Percentage reduction of area after fracture for machined test pieces, Z, %

min.

–

Elongation after fracture for full-size fasteners, A_f (see also Annex C)

min.

–

0,24

–

0,22

0,20

–

Head soundness

No fracture

Vickers hardness, HV F ≥ 98 N

min.

120

130

155

160

190

250

255

290

320

385

max.

220 ^g

250

320

335

360

380

435

Brinell hardness, HBW F = 30 D²

min.

114

124

147

152

181

245

250

286

316

380

max.

209 ^g

238

316

331

355

375

429

Rockwell hardness, HRB

min.

–

max.

95,0 ^g

99,5

–

Rockwell hardness, HRC

min.

–

max.

–

Surface hardness, HV 0,3

max.

–

390

435

Non-carburization, HV 0,3

max.

–

Height of non-decarburized thread zone, E, mm

min.

–

1/2 H₁

2/3 H₁

3/4 H₁

Depth of complete decarburization in the thread, G, mm

max.

–

Reduction of hardness after retempering, HV

max.

–

Breaking torque, M_B, Nm

min.

–

in accordance with ISO 898-7

Impact strength, K_V ^{i j}, J

min.

–

Surface integrity in accordance with

ISO 6157-1^l

ISO 6157-3

a Values do not apply to structural bolting.
b For structural bolting d ≥ M12.
c Nominal values are specified only for the purpose of the designation system for property classes. See Clause 5.
d In cases where the lower yield strength, ReL, cannot be determined, it is permissible to measure the stress at 0,2 % nonproportional elongation Rp0,2.
e For the property classes 4.8, 5.8 and 6.8, the values for Rpf,min are under investigation. The values at the time of publication of this part of ISO 898 are given for calculation of the proof stress ratio only. They are not test values.
f Proof loads are specified in Tables 5 and 7.
g Hardness determined at the end of a fastener shall be 250 HV, 238 HB or 99,5 HRB maximum.
h Surface hardness shall not be more than 30 Vickers points above the measured base metal hardness of the fastener when determination of both surface hardness and base metal hardness are carried out with HV 0,3 (see 9.11).
i Values are determined at a test temperature of −20 °C (see 9.14).
j Applies to d ≥ 16 mm.
k Value for KV is under investigation.
l Instead of ISO 6157-1, ISO 6157-3 may apply by agreement between the manufacturer and the purchaser.

Thread^a d	Nominal stress area A_s,nom^b mm²	Property class
M3	5,03	2010	2110	2510	2620	3020	4020	4530	5230	6140
M3,5	6,78	2710	2850	3390	3530	4070	5420	6100	7050	8270
M4	8,78	3510	3690	4390	4570	5270	7020	7900	9130	10700
M5	14,2	5680	5960	7100	7380	8520	11350	12800	14800	17300
M6	20,1	8040	8440	10000	10400	12100	16100	18100	20900	24500
M7	28,9	11600	12100	14400	15000	17300	23100	26000	30100	35300
M8	36,6	14600 ^c	15400	18300 ^c	19000	22000	29200 ^c	32900	38100 ^c	44600
M10	58	23200 ^c	24400	29000 ^c	30200	34800	46400 ^c	52200	60300 ^c	70800
M12	84,3	33700	35400	42200	43800	50600	67400 ^d	75900	87700	103000
M14	115	46000	48300	57500	59800	69000	92000 ^d	104000	120000	140000
M16	157	62800	65900	78500	81600	94000	125000 ^d	141000	163000	192000
M18	192	76800	80600	96000	99800	115000	159000	–	200000	234000
M20	245	98000	103000	122000	127000	147000	203000	–	255000	299000
M22	303	121000	127000	152000	158000	182000	252000	–	315000	370000
M24	353	141000	148000	176000	184000	212000	293000	–	367000	431000
M27	459	184000	193000	230000	239000	275000	381000	–	477000	560000
M30	561	224000	236000	280000	292000	337000	466000	–	583000	684000
M33	694	278000	292000	347000	361000	416000	576000	–	722000	847000
M36	817	327000	343000	408000	425000	490000	678000	–	850000	997000
M39	976	390000	410000	488000	508000	586000	810000	–	1020000	1200000
a Where no thread pitch is indicated in a thread designation, coarse pitch is specified. b To calculate A_s,nom. c For fasteners with thread tolerance 6az in accordance with ISO 965-4 subject to hot dip galvanizing, reduced values in accordance with ISO 10684:2004, Annex A, apply. d For structural bolting 70 000 N (for M12), 95 500 N (for M14) and 130 000 N (for M16).

Thread^a d

Nominal stress area A_s,nom^b mm²

Property class

4.6

4.8

5.6

5.8

6.8

8.8

9.8

10.9

12.9/12.9

Minimum ultimate tensile load, F_m,min (A_s,nom x R_m,min), N

5,03

2010

2110

2510

2620

3020

4020

4530

5230

6140

M3,5

6,78

2710

2850

3390

3530

4070

5420

6100

7050

8270

8,78

3510

3690

4390

4570

5270

7020

7900

9130

10700

14,2

5680

5960

7100

7380

8520

11350

12800

14800

17300

20,1

8040

8440

10000

10400

12100

16100

18100

20900

24500

28,9

11600

12100

14400

15000

17300

23100

26000

30100

35300

36,6

14600 ^c

15400

18300 ^c

19000

22000

29200 ^c

32900

38100 ^c

44600

M10

23200 ^c

24400

29000 ^c

30200

34800

46400 ^c

52200

60300 ^c

70800

M12

84,3

33700

35400

42200

43800

50600

67400 ^d

75900

87700

103000

M14

115

46000

48300

57500

59800

69000

92000 ^d

104000

120000

140000

M16

157

62800

65900

78500

81600

94000

125000 ^d

141000

163000

192000

M18

192

76800

80600

96000

99800

115000

159000

–

200000

234000

M20

245

98000

103000

122000

127000

147000

203000

–

255000

299000

M22

303

121000

127000

152000

158000

182000

252000

–

315000

370000

M24

353

141000

148000

176000

184000

212000

293000

–

367000

431000

M27

459

184000

193000

230000

239000

275000

381000

–

477000

560000

M30

561

224000

236000

280000

292000

337000

466000

–

583000

684000

M33

694

278000

292000

347000

361000

416000

576000

–

722000

847000

M36

817

327000

343000

408000

425000

490000

678000

–

850000

997000

M39

976

390000

410000

488000

508000

586000

810000

–

1020000

1200000

a Where no thread pitch is indicated in a thread designation, coarse pitch is specified.
b To calculate A_s,nom.
c For fasteners with thread tolerance 6az in accordance with ISO 965-4 subject to hot dip galvanizing, reduced values in accordance with ISO 10684:2004, Annex A, apply.
d For structural bolting 70 000 N (for M12), 95 500 N (for M14) and 130 000 N (for M16).

Thread^a d	Nominal stress area A_s,nom^b mm²	Property class
M3	5,03	1130	1560	1410	1910	2210	2920	3270	4180	4880
M3,5	6,78	1530	2100	1900	2580	2980	3940	4410	5630	6580
M4	8,78	1980	2720	2460	3340	3860	5100	5710	7290	8520
M5	14,2	3200	4400	3980	5400	6250	8230	9230	11800	13800
M6	20,1	4520	6230	5630	7640	8840	11600	13100	16700	19500
M7	28,9	6500	8960	8090	11000	12700	16800	18800	24000	28000
M8	36,6	8240 ^c	11400	10200 ^c	13900	16100	21200 ^c	23800	30400 ^c	35500
M10	58	13000 ^c	18000	16200 ^c	22000	25500	33700 ^c	37700	48100 ^c	56300
M12	84,3	19000	26100	23600	32000	37100	48900 ^d	54800	70000	81800
M14	115	25900	35600	32200	43700	50600	66700 ^d	74800	95500	112000
M16	157	35300	48700	44000	59700	69100	91000 ^d	102000	130000	152000
M18	192	43200	59500	53800	73000	84500	115000	–	159000	186000
M20	245	55100	76000	68600	93100	108000	147000	–	203000	238000
M22	303	68200	93900	84800	115000	133000	182000	–	252000	294000
M24	353	79400	109000	98800	134000	155000	212000	–	293000	342000
M27	459	103000	142000	128000	174000	202000	275000	–	381000	445000
M30	561	126000	174000	157000	213000	247000	337000	–	466000	544000
M33	694	156000	215000	194000	264000	305000	416000	–	576000	673000
M36	817	184000	253000	229000	310000	359000	490000	–	678000	792000
M39	976	220000	303000	273000	371000	429000	586000	–	810000	947000
a Where no thread pitch is indicated in a thread designation, coarse pitch is specified. b To calculate A_s,nom c For fasteners with thread tolerance 6az in accordance with ISO 965-4 subject to hot dip galvanizing, reduced values in accordance with ISO 10684:2004, Annex A, apply. d For structural bolting 50 700 N (for M12), 68 800 N (for M14) and 94 500 N (for M16).

Thread^a d

Nominal stress area A_s,nom^b mm²

Property class

4.6

4.8

5.6

5.8

6.8

8.8

9.8

10.9

12.9/12.9

Proof load, F_p (A_s,nom x S_p,nom), N

5,03

1130

1560

1410

1910

2210

2920

3270

4180

4880

M3,5

6,78

1530

2100

1900

2580

2980

3940

4410

5630

6580

8,78

1980

2720

2460

3340

3860

5100

5710

7290

8520

14,2

3200

4400

3980

5400

6250

8230

9230

11800

13800

20,1

4520

6230

5630

7640

8840

11600

13100

16700

19500

28,9

6500

8960

8090

11000

12700

16800

18800

24000

28000

36,6

8240 ^c

11400

10200 ^c

13900

16100

21200 ^c

23800

30400 ^c

35500

M10

13000 ^c

18000

16200 ^c

22000

25500

33700 ^c

37700

48100 ^c

56300

M12

84,3

19000

26100

23600

32000

37100

48900 ^d

54800

70000

81800

M14

115

25900

35600

32200

43700

50600

66700 ^d

74800

95500

112000

M16

157

35300

48700

44000

59700

69100

91000 ^d

102000

130000

152000

M18

192

43200

59500

53800

73000

84500

115000

–

159000

186000

M20

245

55100

76000

68600

93100

108000

147000

–

203000

238000

M22

303

68200

93900

84800

115000

133000

182000

–

252000

294000

M24

353

79400

109000

98800

134000

155000

212000

–

293000

342000

M27

459

103000

142000

128000

174000

202000

275000

–

381000

445000

M30

561

126000

174000

157000

213000

247000

337000

–

466000

544000

M33

694

156000

215000

194000

264000

305000

416000

–

576000

673000

M36

817

184000

253000

229000

310000

359000

490000

–

678000

792000

M39

976

220000

303000

273000

371000

429000

586000

–

810000

947000

a Where no thread pitch is indicated in a thread designation, coarse pitch is specified.
b To calculate A_s,nom
c For fasteners with thread tolerance 6az in accordance with ISO 965-4 subject to hot dip galvanizing, reduced values in accordance with ISO 10684:2004, Annex A, apply.
d For structural bolting 50 700 N (for M12), 68 800 N (for M14) and 94 500 N (for M16).

Thread d x P	Nominal stress area A_s,nom^a mm²	Property class
M8x1	39,2	15700	16500	19600	20400	23500	31360	35300	40800	47800
M10x1,25	61,2	24500	25700	30600	31800	36700	49000	55100	63600	74700
M10x1	64,5	25800	27100	32300	33500	38700	51600	58100	67100	78700
M12x1,5	88,1	35200	37000	44100	45800	52900	70500	79300	91600	107000
M12x1,25	92,1	36800	38700	46100	47900	55300	73700	82900	95800	112000
M14x1,5	125	50000	52500	62500	65000	75000	100000	112000	130000	152000
M16x1,5	167	66800	70100	83500	86800	100000	134000	150000	174000	204000
M18x1,5	216	86400	90700	108000	112000	130000	179000	–	225000	264000
M20x1,5	272	109000	114000	136000	141000	163000	226000	–	283000	332000
M22x1,5	333	133000	140000	166000	173000	200000	276000	–	346000	406000
M24x2	384	154000	161000	192000	200000	230000	319000	–	399000	469000
M27x2	496	198000	208000	248000	258000	298000	412000	–	516000	605000
M30x2	621	248000	261000	310000	323000	373000	515000	–	646000	758000
M33x2	761	304000	320000	380000	396000	457000	632000	–	791000	928000
M36x3	865	346000	363000	432000	450000	519000	718000	–	900000	1055000
M39x3	1030	412000	433000	515000	536000	618000	855000	–	1070000	1260000
a To calculate A_s,nom

Thread d x P

Nominal stress area A_s,nom^a mm²

Property class

4.6

4.8

5.6

5.8

6.8

8.8

9.8

10.9

12.9/12.9

Minimum ultimate tensile load, F_m,min (A_s,nom ´ R_m,min), N

M8x1

39,2

15700

16500

19600

20400

23500

31360

35300

40800

47800

M10x1,25

61,2

24500

25700

30600

31800

36700

49000

55100

63600

74700

M10x1

64,5

25800

27100

32300

33500

38700

51600

58100

67100

78700

M12x1,5

88,1

35200

37000

44100

45800

52900

70500

79300

91600

107000

M12x1,25

92,1

36800

38700

46100

47900

55300

73700

82900

95800

112000

M14x1,5

125

50000

52500

62500

65000

75000

100000

112000

130000

152000

M16x1,5

167

66800

70100

83500

86800

100000

134000

150000

174000

204000

M18x1,5

216

86400

90700

108000

112000

130000

179000

–

225000

264000

M20x1,5

272

109000

114000

136000

141000

163000

226000

–

283000

332000

M22x1,5

333

133000

140000

166000

173000

200000

276000

–

346000

406000

M24x2

384

154000

161000

192000

200000

230000

319000

–

399000

469000

M27x2

496

198000

208000

248000

258000

298000

412000

–

516000

605000

M30x2

621

248000

261000

310000

323000

373000

515000

–

646000

758000

M33x2

761

304000

320000

380000

396000

457000

632000

–

791000

928000

M36x3

865

346000

363000

432000

450000

519000

718000

–

900000

1055000

M39x3

1030

412000

433000

515000

536000

618000

855000

–

1070000

1260000

a To calculate A_s,nom

Thread d x P	Nominal stress area A_s,nom^a mm²	Property class
M8x1	39,2	8820	12200	11000	14900	17200	22700	25500	32500	38000
M10x1,25	61,2	13800	19000	17100	23300	26900	35500	39800	50800	59400
M10x1	64,5	14500	20000	18100	24500	28400	37400	41900	53500	62700
M12x1,5	88,1	19800	27300	24700	33500	38800	51100	57300	73100	85500
M12x1,25	92,1	20700	28600	25800	35000	40500	53400	59900	76400	89300
M14x1,5	125	28100	38800	35000	47500	55000	72500	81200	104000	121000
M16x1,5	167	37600	51800	46800	63500	73500	96900	109000	139000	162000
M18x1,5	216	48600	67000	60500	82100	95000	130000	–	179000	210000
M20x1,5	272	61200	84300	76200	103000	120000	163000	–	226000	264000
M22x1,5	333	74900	103000	93200	126000	146000	200000	–	276000	323000
M24x2	384	86400	119000	108000	146000	169000	230000	–	319000	372000
M27x2	496	112000	154000	139000	188000	218000	298000	–	412000	481000
M30x2	621	140000	192000	174000	236000	273000	373000	–	515000	602000
M33x2	761	171000	236000	213000	289000	335000	457000	–	632000	738000
M36x3	865	195000	268000	242000	329000	381000	519000	–	718000	839000
M39x3	1030	232000	319000	288000	391000	453000	618000	–	855000	999000
a To calculate A_s,nom.

Thread d x P

Nominal stress area A_s,nom^a mm²

Property class

4.6

4.8

5.6

5.8

6.8

8.8

9.8

10.9

12.9/12.9

Proof load, F_p (A_{s,nom x}S_p,nom), N

M8x1

39,2

8820

12200

11000

14900

17200

22700

25500

32500

38000

M10x1,25

61,2

13800

19000

17100

23300

26900

35500

39800

50800

59400

M10x1

64,5

14500

20000

18100

24500

28400

37400

41900

53500

62700

M12x1,5

88,1

19800

27300

24700

33500

38800

51100

57300

73100

85500

M12x1,25

92,1

20700

28600

25800

35000

40500

53400

59900

76400

89300

M14x1,5

125

28100

38800

35000

47500

55000

72500

81200

104000

121000

M16x1,5

167

37600

51800

46800

63500

73500

96900

109000

139000

162000

M18x1,5

216

48600

67000

60500

82100

95000

130000

–

179000

210000

M20x1,5

272

61200

84300

76200

103000

120000

163000

–

226000

264000

M22x1,5

333

74900

103000

93200

126000

146000

200000

–

276000

323000

M24x2

384

86400

119000

108000

146000

169000

230000

–

319000

372000

M27x2

496

112000

154000

139000

188000

218000

298000

–

412000

481000

M30x2

621

140000

192000

174000

236000

273000

373000

–

515000

602000

M33x2

761

171000

236000

213000

289000

335000

457000

–

632000

738000

M36x3

865

195000

268000

242000

329000

381000

519000

–

718000

839000

M39x3

1030

232000

319000

288000

391000

453000

618000

–

855000

999000

a To calculate A_s,nom.

Finish of fastener	Thread tolerance class
As processed	6h or 6g	6H
Electroplating to ISO 4042	6g or 6e or 6f	6H
Zinc flake coating to ISO 10683	6g or 6e or 6f	6H
Hot dip galvanizing to ISO 10684 in order to mate with nuts tapped to thread tolerance classes: – 6H – 6AZ – 6AX	6az 6g or 6h 6g or 6h	6H 6AZ 6AX

Finish of fastener

Thread tolerance class

Thread tolerance class of fastener before any surface coating

Thread tolerance class of internally threaded adaptor

As processed

6h or 6g

Electroplating to ISO 4042

6g or 6e or 6f

Zinc flake coating to ISO 10683

6g or 6e or 6f

Hot dip galvanizing to ISO 10684 in order to mate with nuts tapped to thread tolerance classes:
– 6H
– 6AZ
– 6AX

6az
6g or 6h
6g or 6h

6H
6AZ
6AX

Nominal thread diameter d	d_h ^ab	r₁ ^c
3	3,4	3,58	0,7
3,5	3,9	4,08	0,7
4	4,5	4,68	0,7
5	5,5	5,68	0,7
6	6,6	6,82	0,7
7	7,6	7,82	0,8
8	9	9,22	0,8
10	11	11,27	0,8
12	13,5	13,77	0,8
14	15,5	15,77	1,3
16	17,5	17,77	1,3
18	20	20,33	1,3
20	22	22,33	1,6
22	24	24,33	1,6
24	26	26,33	1,6
27	30	30,33	1,6
30	33	33,39	1,6
33	36	36,39	1,6
36	39	39,39	1,6
39	42	42,39	1,6
a Medium series in accordance with ISO 273. b For square neck bolts, the hole shall be adapted to accommodate the square neck. c For product grade C, a radius, r1, should be used in accordance with the following formula: r₁ = r_max + 0,2 where r _max = d_a,max– d_s,min/2

Nominal thread diameter d

d_h ^ab

r₁ ^c

min.

max.

3,4

3,58

0,7

3,5

3,9

4,08

0,7

4,5

4,68

0,7

5,5

5,68

0,7

6,6

6,82

0,7

7,6

7,82

0,8

9,22

0,8

11,27

0,8

13,5

13,77

0,8

15,5

15,77

1,3

17,5

17,77

1,3

20,33

1,3

22,33

1,6

24,33

1,6

26,33

1,6

30,33

1,6

33,39

1,6

36,39

1,6

39,39

1,6

42,39

1,6

a Medium series in accordance with ISO 273.
b For square neck bolts, the hole shall be adapted to accommodate the square neck.
c For product grade C, a radius, r1, should be used in accordance with the following formula:
r₁ = r_max + 0,2
where
r _max = d_a,max– d_s,min/2

Nominal thread diameter d mm	Property class for
3 ≤ d ≤ 20	10°	6°	6°	4°
20 < d ≤ 39	6°	4°	4°	4°

Nominal thread diameter d mm

Property class for

bolts and screws with unthreaded shank length ls ≥ 2d

screws threaded to the head and bolts and screws with unthreaded shank length ls < 2d

4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9

12.9/12.9

4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9

12.9/12.9

a ± 30′

3 ≤ d ≤ 20

10°

6°

4°

20 < d ≤ 39

6°

4°

Property class	4.6	5.6	4.8	5.8	6.8	8.8	9.8	10.9	12.9/12.9
^b	60°	80°

Property class

4.6

5.6

4.8

5.8

6.8

8.8

9.8

10.9

12.9/12.9

60°

80°

Pitch of thread P ^a	H1	Property class
0,5	307	154	205	230
0,6	368	184	245	276
0,7	429	215	286	322
0,8	491	245	327	368
1	613	307	409	460
1,25	767	384	511	575
1,5	920	460	613	690
1,75	1,074	537	716	806
2	1,227	614	818	920
2,5	1,534	767	1,023	1,151
3	1,840	920	1,227	1,380
3,5	2,147	1,074	1,431	1,610
4	2,454	1,227	1,636	1,841
a For P < 1,25 mm, microscopic method only. b Calculated on the basis of the specification

Pitch of thread P ^a

Property class

8.8, 9.8

10.9

12.9/12.9

E_min ^b

0,5

307

154

205

230

0,6

368

184

245

276

0,7

429

215

286

322

0,8

491

245

327

368

613

307

409

460

1,25

767

384

511

575

1,5

920

460

613

690

1,75

1,074

537

716

806

1,227

614

818

920

2,5

1,534

767

1,023

1,151

1,840

920

1,227

1,380

3,5

2,147

1,074

1,431

1,610

2,454

1,227

1,636

1,841

a For P < 1,25 mm, microscopic method only.
b Calculated on the basis of the specification

Property	Test method	Property class
1	Minimum tensile strength, R_m,min	Tensile test under wedge loading	9.1	^NF	^a	^NF	^a
Tensile test	9.2	^NF	^a	^NF	^a
5	Nominal stress under proof load, S_p,nom	Proof load test	9.6	^NF		^NF
8	Minimum elongation after fracture, A_f,min	Tensile test for full-size fasteners	9.3	^NF	^{b d}	^{c d}	^NF	^{b d}
9	Head soundness	Head soundness test d ≤ 10 mm	1,5d ≤ l &l_t; 3d	9.8
l ≥ 3d
10 or 11 or 12	Hardness	Hardness test	9.9
13	Maximum surface hardness	Carburization test	9.11	^NF	^NF
14	Non- carburization	^NF	^NF
15	Maximum decarburized zone	Decarburization test	9.10	^NF	^NF
16	Reduction of hardness after retempering	Retempering test	9.12	^NF	^NF	^e	^e
17	Minimum breaking torque, M_B,min	Torsional test 1,6 mm ≤ d ≤ 10 mm, b ≥ 1d + 2P^f	9.13	^g	^{g h}		^h
19	Surface integrity	Surface discontinuity inspection	9.15
a For fasteners with d ≥ 3 mm, l ≥ 2d and b < 2d, see 9.1.5 and 9.2.5. b Values for property classes 4.6, 5.6, 8.8 and 10.9 are given in Annex C. c For property classes 4.8, 5.8 and 6.8. d l ≥ 2,7d and b ≥ 2,2d. e This test is a reference test to be applied in case of dispute. f For the torsional test, these specific dimensional limits apply instead of the limits specified in the header of this table. g For property classes 4.6 to 6.8, no values are specified in ISO 898-7. h May be used instead of tensile test; however, in case of dispute the tensile test applies.

Property

Test method

Property class

4.6, 4.8, 5.6, 5.8, 6.8

8.8, 9.8, 10.9, 12.9/12.9

d < 3 mm or l < 2,5d or b < 2,0d

d ≥ 3 mm and l ≥ 2,5d and b ≥ 2,0 d

d < 3 mm or l < 2,5d or b < 2,0d

d ≥ 3 mm and l ≥ 2,5d and b ≥ 2,0 d

No. (see Table 3)

Subclause

Minimum tensile strength, R_m,min

Tensile test under wedge loading

9.1

^NF

Tensile test

9.2

^NF

Nominal stress under proof load, S_p,nom

Proof load test

9.6

^NF

Minimum elongation after fracture, A_f,min

Tensile test for full-size fasteners

9.3

^NF

^{b d}

^{c d}

^NF

^{b d}

Head soundness

Head soundness test d ≤ 10 mm

1,5d ≤ l &l_t; 3d

9.8

l ≥ 3d

10 or 11 or 12

Hardness

Hardness test

9.9

Maximum surface hardness

Carburization test

9.11

^NF

Non- carburization

^NF

Maximum decarburized zone

Decarburization test

9.10

^NF

Reduction of hardness after retempering

Retempering test

9.12

^NF

Minimum breaking torque, M_B,min

Torsional test 1,6 mm ≤ d ≤ 10 mm, b ≥ 1d + 2P^f

9.13

^{g h}

Surface integrity

Surface discontinuity inspection

9.15

a For fasteners with d ≥ 3 mm, l ≥ 2d and b < 2d, see 9.1.5 and 9.2.5.
b Values for property classes 4.6, 5.6, 8.8 and 10.9 are given in Annex C.
c For property classes 4.8, 5.8 and 6.8.
d l ≥ 2,7d and b ≥ 2,2d.
e This test is a reference test to be applied in case of dispute.
f For the torsional test, these specific dimensional limits apply instead of the limits specified in the header of this table.
g For property classes 4.6 to 6.8, no values are specified in ISO 898-7.
h May be used instead of tensile test; however, in case of dispute the tensile test applies.

Property	Test method	Property class
1	Minimum tensile strength, R_m,min	Tensile test	9.2	^NF	^a	^NF	^a
5	Nominal stress under proof load, S_p,nom	Proof load test	9.6	^NF		^NF
8	Minimum elongation after fracture, A_f,min	Tensile test for full- size fasteners	9.3	^NF	^{b c}	^{b d}	^NF	^{b c}
10 or 11 or 12	Hardness	Hardness test	9.9
13	Maximum surface hardness	Carburization test	9.11	^NF	^NF
14	Non-carburization	^NF	^NF
15	Maximum decarburized zone	Decarburization test	9.1	^NF	^NF
16	Reduction of hardness after retempering	Retempering test	9.12	^NF	^NF	^e	^e
19	Surface integrity	Surface discontinuity inspection	9.15
a If fracture occurs in the threaded length of the stud (metal) end, bm, minimum hardness applies instead of R _m,min . Alternatively, the tensile strength Rm using machined test pieces in accordance with 9.7 may be determined. b lt ≥ 3,2d, b ≥ 2,2d. c Values for property classes 4.6, 5.6, 8.8 and 10.9 are given in Annex C. d For property classes 4.8, 5.8 and 6.8. e This test is a reference test to be applied in case of dispute.

Property

Test method

Property class

4.6, 4.8, 5.6, 5.8, 6.8

8.8, 9.8, 10.9, 12.9/12.9

d < 3 mm or l_t < 3d or b < 2,0d

d ≥ 3 mm and l_t ≥ 3d and b ≥ 2,0 d

d < 3 mm or l_t < 3d or b < 2,0d

d ≥ 3 mm and l_t ≥ 3d and b ≥ 2,0 d

No. (see Table 3)

Subclause

Minimum tensile strength, R_m,min

Tensile test

9.2

^NF

Nominal stress under proof load, S_p,nom

Proof load test

9.6

^NF

Minimum elongation after fracture, A_f,min

Tensile test for full- size fasteners

9.3

^NF

^{b c}

^{b d}

^NF

^{b c}

10 or 11 or 12

Hardness

Hardness test

9.9

Maximum surface hardness

Carburization test

9.11

^NF

Non-carburization

^NF

Maximum decarburized zone

Decarburization test

9.1

^NF

Reduction of hardness after retempering

Retempering test

9.12

^NF

Surface integrity

Surface discontinuity inspection

9.15

_m,min

. Alternatively, the tensile strength Rm using machined test pieces in accordance with 9.7 may be determined. b lt ≥ 3,2d, b ≥ 2,2d. c Values for property classes 4.6, 5.6, 8.8 and 10.9 are given in Annex C. d For property classes 4.8, 5.8 and 6.8. e This test is a reference test to be applied in case of dispute.

Property	Test method	Property class
^a	Minimum ultimate tensile load	Tensile test for screws which do not break in the free threaded length due to head design	9.4	^NF	^a	^NF	^a
10 or 11 or 12	Hardness	Hardness test	9.9
13	Maximum surface hardness	Carburization test	9.11	^NF	^NF
14	Non-carburization	^NF	^NF
15	Maximum decarburized zone	Decarburization test	9.1	^NF	^NF
16	Reduction of hardness after retempering	Retempering test	9.12	^NF	^NF	^b	^b
19	Surface integrity	Surface discontinuity inspection	9.15
a See relevant product standard for minimum ultimate tensile load. b This test is a reference test to be applied in case of dispute.

Property

Test method

Property class

4.6, 4.8, 5.6, 5.8, 6.8

8.8, 9.8, 10.9, 12.9/12.9

d < 3 mm or lt < 3d or b < 2,0d

d ≥ 3 mm and l ≥ 2,5d and b ≥ 2,0 d

d < 3 mm or lt < 3d or b < 2,0d

d ≥ 3 mm and l ≥ 2,5d and b ≥ 2,0 d

No. (see Table 3)

Subclause

Minimum ultimate tensile load

Tensile test for screws which do not break in the free threaded length due to head design

9.4

^NF

10 or 11 or 12

Hardness

Hardness test

9.9

Maximum surface hardness

Carburization test

9.11

^NF

Non-carburization

^NF

Maximum decarburized zone

Decarburization test

9.1

^NF

Reduction of hardness after retempering

Retempering test

9.12

^NF

Surface integrity

Surface discontinuity inspection

9.15

a See relevant product standard for minimum ultimate tensile load.
b This test is a reference test to be applied in case of dispute.

Property	Test method	Property class
1	Minimum tensile strength, R_m,min	Tensile test for bolts and studs with waisted shank	9.5	^NF	^a	^NF	^a
10 or 11 or 12	Hardness	Hardness test	9.9
13	Maximum surface hardness	Carburization test	9.11	^NF	^NF
14	Non-carburization	^NF	^NF
15	Maximum decarburized zone	Decarburization test	9.10	^NF	^NF
16	Reduction of hardness after retempering	Retempering test	9.12	^NF	^NF	^b	^b
19	Surface integrity	Surface discontinuity inspection	9.15
a Rm is related to the cross-sectional area of the waisted shank, Ads = π/4 ds² b This test is a reference test to be applied in case of dispute.

Property

Test method

Property class

4.6, 5.6

8.8, 9.8, 10.9, 12.9/12.9

d < 3 mm or waist length <3ds or b < d

d ≥ 3 mm and waist length ≥3ds and b ≥ d

d < 3 mm or waist length <3ds or b < d

d ≥ 3 mm and waist length ≥3ds and b ≥ d

No. (see Table 3)

Subclause

Minimum tensile strength, R_m,min

Tensile test for bolts and studs with waisted shank

9.5

^NF

10 or 11 or 12

Hardness

Hardness test

9.9

Maximum surface hardness

Carburization test

9.11

^NF

Non-carburization

^NF

Maximum decarburized zone

Decarburization test

9.10

^NF

Reduction of hardness after retempering

Retempering test

9.12

^NF

Surface integrity

Surface discontinuity inspection

9.15

a Rm is related to the cross-sectional area of the waisted shank, Ads = π/4 ds²
b This test is a reference test to be applied in case of dispute.

Property	Test method	Property class
1	Minimum tensile strength, R_m,min	Tensile test for machined test pieces	9.7
2	Minimum lower yield strength, R_eL,min	^h	^h	^NF	^NF	^NF
3	Minimum stress at 0,2 % non-proportional elongation, R_{p0,2 min}	^NFh	^NFh
6	Minimum elongation after fracture, A_min
7	Minimum reduction of area after fracture, Z_min	^NF	^NF
10 or 11 or 12	Hardness	Hardness test	9.9
13	Maximum surface hardness	Carburization test	9.11	^NF	^NF
14	Non-carburization	^NF	^NF
15	Maximum decarburized zone	Decarburization test	9.1	^NF	^NF
18	Minimum impact strength, K_v,min	Impact test d ≥ 16 mm and lⁱ or l_t ≥ 55 mm^j	9.14	^NF	^k	^NF
19	Surface integrity^l	Surface discontinuity inspection	9.15
a To determine the minimum total length, lt, for studs, add 1d to the length formula. b For bolts and screws l ≥ 5d to determine Zmin. c For studs lt ≥ 6d to determine Zmin. d For bolts and screws l ≥ d + 20 mm to determine Zmin. e For studs lt ≥ 2d + 20 mm to determine Zmin. f For bolts and screws l ≥ 4d + 8 mm to determine Zmin. g For studs lt ≥ 5d + 8 mm to determine Zmin. h In cases where the lower yield strength, ReL, cannot be determined, it is permissible to measure the stress at 0,2 % nonproportional elongation Rp0,2. i The solid part of the head may be included. j For the impact test, these specific dimensional limits apply instead of the limits specified in the header of this table. k Only for property class 5.6. l To be evaluated before machining.

Property

Test method

Property class

4.6, 5.6

8.8, 9.8, 10.9, 12.9/12.9

3 ≤ d < 4,5 mm and d₀ < d₃,min and b ≥ d and l ≥ 6,5d^a

d ≥ 4,5 mm and d₀ ≥ 3 mm and b ≥ d and l ≥ d + 26 mm^a

3 ≤ d < 4,5 mm and d₀ < d₃,min and b ≥ d and l ≥ 6,5d ^abc

4,5 ≤ d ≤ 16 mm and d₀ ≥ 3 mm and b ≥ d and l ≥ d + 26 mm ^ade

d > 16 mm and d₀ ≥ 0,75d_s and b ≥ d and l ≥ 5,5d + 8 mm^afg

No. (see Table 3)

Sub clause

Minimum tensile strength, R_m,min

Tensile test for machined test pieces

9.7

Minimum lower yield strength, R_eL,min

^NF

Minimum stress at 0,2 % non-proportional elongation, R_{p0,2 min}

^NFh

Minimum elongation after fracture, A_min

Minimum reduction of area after fracture, Z_min

^NF

10 or 11 or 12

Hardness

Hardness test

9.9

Maximum surface hardness

Carburization test

9.11

^NF

Non-carburization

^NF

Maximum decarburized zone

Decarburization test

9.1

^NF

Minimum impact strength, K_v,min

Impact test d ≥ 16 mm and lⁱ or l_t ≥ 55 mm^j

9.14

^NF

Surface integrity^l

Surface discontinuity inspection

9.15

a To determine the minimum total length, lt, for studs, add 1d to the length formula.
b For bolts and screws l ≥ 5d to determine Zmin.
c For studs lt ≥ 6d to determine Zmin.
d For bolts and screws l ≥ d + 20 mm to determine Zmin.
e For studs lt ≥ 2d + 20 mm to determine Zmin.
f For bolts and screws l ≥ 4d + 8 mm to determine Zmin.
g For studs lt ≥ 5d + 8 mm to determine Zmin.
h In cases where the lower yield strength, ReL, cannot be determined, it is permissible to measure the stress at 0,2 % nonproportional elongation Rp0,2.
i The solid part of the head may be included.
j For the impact test, these specific dimensional limits apply instead of the limits specified in the header of this table.
k Only for property class 5.6.
l To be evaluated before machining.

Property	Test method	Property class
1	Minimum tensile strength, R_m,min	Tensile test for finished fasteners	9.2	^d	^d	^d
4	Minimum stress at 0,0048d non-proportional elongation, R_pf,min	Tensile test for full-size fasteners	9.3	^d		^d
5	Nominal stress under proof load, S_p,nom	Proof load test for finished fasteners	9.6	^d	^d	^d
8	Minimum elongation after fracture, A_f,min	Tensile test for full-size fasteners	9.3	^d		^d
10 or 11 or 12	Hardness	Hardness test	9.9
13	Maximum surface hardness	Carburization test	9.11	^NF	^NF
14	Non-carburization	^NF	^NF
15	Maximum decarburized zone	Decarburization test	9.10	^NF	^NF
16	Reduction of hardness after retempering	Retempering test	9.12	^NF	^NF	^f
19	Surface integrity	Surface discontinuity inspection	9.15
a For studs with metal end stronger than the nut end, or for fully threaded studs with lt ≥ 3,2d. b For property classes 4.6 and 5.6, the stress at 0,0048d non-proportional elongation, Rpf, is not specified in Table 3. c No values available. d l ≥ 2,5d and b ≥ 2,0d. e Values for Af are given in Annex C for information. f This test is a reference test to be applied in case of dispute

Property

Test method

Property class

4.6, 5.6

4.8, 5.8, 6.8

8.8, 9.8, 10.9, 12.9/12.9

No. (see Table 3)

Subclause

d ≥ 3 mm and l ≥ 2,7da and b ≥ 2,2d

Minimum tensile strength, R_m,min

Tensile test for finished fasteners

9.2

Minimum stress at 0,0048d non-proportional elongation, R_pf,min

Tensile test for full-size fasteners

9.3

Nominal stress under proof load, S_p,nom

Proof load test for finished fasteners

9.6

Minimum elongation after fracture, A_f,min

Tensile test for full-size fasteners

9.3

10 or 11 or 12

Hardness

Hardness test

9.9

Maximum surface hardness

Carburization test

9.11

^NF

Non-carburization

^NF

Maximum decarburized zone

Decarburization test

9.10

^NF

Reduction of hardness after retempering

Retempering test

9.12

^NF

Surface integrity

Surface discontinuity inspection

9.15

a For studs with metal end stronger than the nut end, or for fully threaded studs with lt ≥ 3,2d.
b For property classes 4.6 and 5.6, the stress at 0,0048d non-proportional elongation, Rpf, is not specified in Table 3.
c No values available.
d l ≥ 2,5d and b ≥ 2,0d.
e Values for Af are given in Annex C for information.
f This test is a reference test to be applied in case of dispute

Property class	4.6	4.8	5.6	5.8	6.8	8.8	9.8	10.9	12.9	12.9
Marking symbol^a	4.6	4.8	5.6	5.8	6.8	8.8	9.8	10.9	12.9	12.9
a The dot in the marking symbol may be omitted.

Property class

4.6

4.8

5.6

5.8

6.8

8.8

9.8

10.9

12.9

Marking symbol^a

4.6

4.8

5.6

5.8

6.8

8.8

9.8

10.9

12.9

a The dot in the marking symbol may be omitted.

Product

Precision Components

Contract Manufacturing

Fastener

Resources

materials

Technical

Product

Precision Components

Contract Manufacturing

Fastener

Resources

materials

Technical

ISO 898-1 Specification

Table of Contents

Scope

Adfast Component LTD: Premium Quality Fasteners as per ISO 898-1

Related Specifications

Chemical composition

Mechanical properties

Test series

Coating Specifications

Renowned Brands

Marking

Quick Link

Fasteners

Contact Us