SW-B

Hard drawn steel wire for springs used in everything between home electronics and furniture (including beds and car seats) to mechanical springs, torsion springs and shutter springs.

NSSG's has used its great technical know-how in Piano Wire for Spring Wire to develop and produce an excellent wire for trustworthy springs.

Chemical composition

C (%) Si (%) Mn (%) P max. (%) S max. (%)
0.49 - 0.56 0.15 - 0.35 0.30 - 0.60 0.030 0.030

Mechanical properties

Other wire sizes or specifications on request.

Torsion Test (<0.70 mm)
Fracture shall be at right angle of the axis of the wire and be free from cracks, flaws or other defects.

Winding Test (0.07 mm ≤ wire diameter ≤ 6.00 mm)
The wire shall not show any sign of damages or fracture when closely wrapped at least 4 turns around a mandrel of the same diameter as the wire.

Twist pattern shall be even throughout the entire length of the wire without longitudinal cracks, local twists or excessive spiral.

For round wire

Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²) Torsions (l=300 mm, min. revs)
0.08 - ±0.006 2450 - 2790
0.09 - ±0.006 2400 - 2750
0.10 - ±0.006 2350 - 2700
0.12 - ±0.008 2300 - 2650
0.14 - ±0.008 2260 - 2600
0.16 - ±0.008 2210 - 2550
0.18 - ±0.008 2210 - 2500
0.20 - ±0.008 2210 - 2500
0.23 - ±0.015 2160 - 2450
0.26 - ±0.015 2110 - 2400
0.29 - ±0.015 2060 - 2350
0.32 - ±0.015 2010 - 2300
0.35 - ±0.015 2010 - 2300
0.40 - ±0.015 1960 - 2260
0.45 - ±0.015 1910 - 2210
0.50 - ±0.015 1910 - 2210
0.55 - ±0.020 1860 - 2160
0.60 - ±0.020 1810 - 2110
0.65 - ±0.020 1810 - 2110
0.70 - ±0.020 1770 - 2060 20
0.80 - ±0.020 1770 - 2010 20
0.90 - ±0.020 1770 - 2010 20
1.00 - ±0.020 1720 - 1960 20
1.20 - ±0.030 1670 - 1910 20
1.40 - ±0.030 1620 - 1860 20
1.60 - ±0.030 1570 - 1810 20
1.80 - ±0.030 1520 - 1770 20
2.00 - ±0.030 1470 - 1720 20
2.30 - ±0.040 1420 - 1670 15
2.60 - ±0.040 1420 - 1670 15
2.90 - ±0.040 1370 - 1620 15
3.20 - ±0.040 1370 - 1570 15
3.50 - ±0.050 1370 - 1570 15
4.00 - ±0.050 1370 - 1570 10
4.50 - ±0.050 1320 - 1520 10
5.00 - ±0.050 1320 - 1520 10
5.50 - ±0.050 1270 - 1470 10
6.00 - ±0.060 1230 - 1420 10
6.50 - ±0.060 1230 - 1420
7.00 - ±0.060 1180 - 1370
8.00 - ±0.060 1180 - 1370
9.00 - ±0.070 1130 - 1320
10.00 - ±0.070 1130 - 1320

Surface conditions

Surface condition

The surface shall be smooth and uniform free from detrimental scratches and other defects.

Additional

Additional information

Deliver form
Other delivery forms on request.

Wire diameter (mm)Coil diameterWire weight (kg)
0.08-0.09 4 inch 0.5
0.10 4 inch 1.0
0.11-0.16 4 inch 1.5 
0.17-0.19 6 inch
0.20-0.26 6 inch
0.27-0.49 10 inch 15 
0.50-0.79 10 inch 30
0.80-1.80 16 inch 70
1.90-3.80 24 inch 140
3.90-10.0 30 inch 140
Wire diameter (mm)Carrier diameterWire weight (kg)
1.00-1.70 16 inch 200
1.80-3.80 24 inch 400
3.90-10.00 30 inch 850