Tensile Strength Grade

Diameter
mm

Tensile Strength，Min，Mpa

Stress at 1% Extension, Min, Mpa

Elongation in 250mm，mim，%

Twist/360’, Min

atio of Mandrel Diameter to Wire Diameter

Common Grade

>1.24-2.25
>2.25-2.75
>2.75-3.00
>3.00-3.50
>3.50-4.25
>4.25-4.75
>4.75-5.50

1340
1310
1310
1290
1290
1290
1290

1170
1140
1140
1100
1100
1100
1100

3.0
3.0
3.5
3.5
4.0
4.0
4.0

16
16
16
14
12
12
12

1
1
1
1
1
1
1

High Strength Grade

>1.24-2.25
>2.25-2.75
>2.75-3.00
>3.00-3.50
>3.50-4.25
>4.25-4.75
>4.75-5.50

1450
1410
1410
1410
1380
1380
1380

1310
1280
1280
1240
1170
1170
1170

2.5
2.5
3.0
3.0
3.0
3.0
3.0

16
16
16
14
12
12
12

3
3
4
4
4
4
4

Extra High Strength Grade

>1.24-2.25
>2.25-2.75
>2.75-3.00
>3.00-3.50
>3.50-4.25
>4.25-4.75
>4.75-5.50

1620
1590
1590
1550
1520
1520
1520

1450
1410
1410
1380
1340
1340
1270

2.0
2.0
2.5
2.5
2.5
2.5
2.5

14
14
12
12
10
10
10

4
4
5
5
5
5
5