Grade

Size-mm/(inch) 

Tolerance-mm/ (inch)

Sectional Area-mm2/ (inch2)

Theoretical

Weight-

Kg/1000m-(lb/1000ft)

Minimum

Breaking

Strength-Kn/ (lbf)

Minimum

Elongation

L0≥610mm%

Relaxation

Value

(1000hs)

Initial

Load

70%

Initial

Load

80%

1725(250)

6.4(0.250)

7.9(0.313)

9.5(0.375)

11.1(0.438)

12.7(0.500)

15.2(0.600)

±0.40

(±0.016)

23.2(0.036)

37.4(0.058)

51.6(0.080)

69.7(0.108)

92.9(0.144)

139.4(0.216)

182(122)

294(197)

405(272)

548(367)

730(490)

1094(737)

40.0(9000)

64.5(14500)

89.0(20000)

120.1(27000)

160.1(36000)

240.2(54000)

3.5

≤2.5%

≤3.5%

1860(270)

9.53(0.375)

11.11(0.438)

12.7(0.500)

13.20(0.520)

14.29(0.563)

15.24(0.600)

17.78(0.700)

+0.65

-0.15

(+0.026)

(-0.006)

54.8(0.085)

74.2(0.115)

98.7(0.153)

107.7(0.167)

123.9(0.192)

140.0(0.217)

189.7(0.294)

432(290)

582(390)

775(520)

844(568)

970(651)

1102(740)

1487(1000)

102.3(23000)

137.9(31000)

183.7(41300)

200.2(45000)

230.0(51700)

260.7(58600)

353.2(79400)

≤3.5

≤2.5%

≤3.5%

Type of

strand

Size/mm

Nominal

Tensile

Strength

N/mm2

Nominal steel

Area

mm2

Nominal

Mass g/m

Tolerance on

Specified characteristic

breaking

Load

Kn

Dia.

mm

Cross-sectional /mm2

Mass

g/m

7-wire 

standard

15.2

12.5

1670

1770

138

93

1090

730

+0.4

-0.2

For all strands

+4% 

-2%

For all

strands

+4%

-2%

232

164

11.0

9.3

1770

1770

71

52

557

408

+0.3

-0.15

125

92

7-wire

super

15.7

12.9

1770

1860

150

100

1180

785

+0.4

-0.2

265

186

11.3

9.6

8.0

1860

1860

1860

75

55

38

590

432

298

+0.3

-0.15

139

102

70

7-wire

drawn

18.0

15.2

12.7

1700

1820

1860

223

165

112

1750

1290

890

+0.4

-0.2

380

300

209