SW-C

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 2790 - 3140
0.09 - ±0.006 2750 - 3090
0.10 - ±0.006 2700 - 3040
0.12 - ±0.008 2650 - 2990
0.14 - ±0.008 2600 - 2940
0.16 - ±0.008 2550 - 2890
0.18 - ±0.008 2500 - 2840
0.20 - ±0.008 2500 - 2790
0.23 - ±0.015 2450 - 2750
0.26 - ±0.015 2400 - 2700
0.29 - ±0.015 2350 - 2650
0.32 - ±0.015 2300 - 2600
0.35 - ±0.015 2300 - 2600
0.40 - ±0.015 2260 - 2550
0.45 - ±0.015 2210 - 2500
0.50 - ±0.015 2210 - 2500
0.55 - ±0.020 2160 - 2450
0.60 - ±0.020 2110 - 2400
0.65 - ±0.020 2110 - 2400
0.70 - ±0.020 2060 - 2350 20
0.80 - ±0.020 2010 - 2300 20
0.90 - ±0.020 2010 - 2260 20
1.00 - ±0.020 1960 - 2210 20
1.20 - ±0.030 1910 - 2160 20
1.40 - ±0.030 1860 - 2110 20
1.60 - ±0.030 1810 - 2060 20
1.80 - ±0.030 1770 - 2010 20
2.00 - ±0.030 1720 - 1960 20
2.30 - ±0.040 1670 - 1910 15
2.60 - ±0.040 1670 - 1910 15
2.90 - ±0.040 1620 - 1860 15
3.20 - ±0.040 1570 - 1810 15
3.50 - ±0.050 1570 - 1770 15
4.00 - ±0.050 1570 - 1770 10
4.50 - ±0.050 1520 - 1720 10
5.00 - ±0.050 1520 - 1720 10
5.50 - ±0.050 1470 - 1670 10
6.00 - ±0.060 1420 - 1620 10
6.50 - ±0.060 1420 - 1620
7.00 - ±0.060 1370 - 1570
8.00 - ±0.060 1370 - 1570
9.00 - ±0.070 1320 - 1520
10.00 - ±0.070 1320 - 1520

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