Table 1. Initial Settings for Determining Stress 1% Extension

Nominal Wire Diameter, mm

Initial Stress, N/mm²

Initial setting of extensometer for a gauge length of 250mm²

1.24

2.25

100

0.125

2.25

3

200

0.25

3

4.75

300

0.375

4.75

5.5

400

0.5

For other gauge lengths, multiply the initial setting by the gauge length in mm divided by 250.

Table 2. Zinc Coating Requirements

Nominal Wire Diameter, mm

Class A

Class B

Class C

Class D

Class E

Over

Up to and incl.

Min. mass of Zn g/m2

Min. no. of one minute dips

Min. mass of Zn g/m2

Min. no. of one minute dips

Min. mass of Zn g/m2

Min. no. of one minute dips

Min. mass of Zn g/m2

Min. no. of one minute dips

Min. mass of Zn g/m2

Min. no. of one minute dips

1.24

1.5

185

2

370

3.5

150

1

365

3

185

2

1.5

1.75

200

2

400

3.5

160

1.5

460

3.5

200

2

1.75

2

215

2.5

430

4

175

2

550

4

215

2.5

2

2.25

215

2.5

430

4

175

2

550

4

250

3.5

2.25

2.75

230

3

460

4

190

2.5

640

5

250

3.5

2.75

3

230

3

460

4

190

2.5

640

5

250

3.5

3

3.5

245

3.5

490

4

205

3

730

6

250

3.5

3.5

4.25

260

3.5

520

4

260

3.5

730

6

260

3.5

4.25

4.75

275

4

550

4

275

4

775

6

275

4

4.75

5

200

4

580

5

290

4

825

6

290

4

5

5.25

290

4

580

5

290

4

825

6

290

4

5.25

5.5

290

4

580

5

290

4

825

6

290

4

Table 3. Mechanical Properties of ST1A Wires

Nominal wire diameter mm

Diameter tolerance

Stress at 1% extension, MPa

Tensile strength, MPa

Elongation on 250mm

Mandrel diameter for wrapping test

No. of torsion twists