The mechanical properties vary depending on the wire’s diameter and class. Below is a typical range as outlined in JIS G3539:
| Wire Diameter (mm) | Tensile Strength (N/mm²) | Elongation (%) | Reduction of Area (%) | | :--- | :--- | :--- | :--- | | 1.0 – 3.0 | 340 – 490 | ≥ 25 | ≥ 50 | | 3.0 – 6.0 | 320 – 470 | ≥ 28 | ≥ 52 | | 6.0 – 14.0 | 310 – 450 | ≥ 30 | ≥ 55 | jis g3539 pdf
These values ensure that the wire can be cold-headed into a fastener without cracking at the head or thread root. The mechanical properties vary depending on the wire’s
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| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | |-------|-------|--------|--------|-------|-------| | SWRCH6A | ≤0.08 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH8A | ≤0.10 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH10A | 0.08–0.13 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH12A | 0.10–0.15 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH15A | 0.13–0.18 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH17A | 0.15–0.20 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH18A | 0.15–0.20 | ≤0.10 | 0.60–0.90 | ≤0.030 | ≤0.030 | | SWRCH22A | 0.18–0.23 | ≤0.10 | 0.70–1.00 | ≤0.030 | ≤0.030 |