This standard covers carbon steel wires that are intended to be shaped at room temperature. Cold heading involves "upsetting" the metal (pushing it into a die) to form heads on fasteners.
By adhering to JIS G 3539, manufacturers ensure that their products meet rigorous benchmarks for:
The official and most up-to-date version of the standard can be acquired through: jis g3539 pdf
It mandates standard test methods, including tensile tests, upsetting tests (compressing a specimen to a fraction of its original height to check for cracks), and microscopic grain size evaluation. Equivalent International Standards
The wire surface is treated with a zinc phosphate layer combined with a lubricant (like soap). This coating reduces friction between the wire and the die, extending tooling life and ensuring smooth surface finishes on final parts. Primary Applications This standard covers carbon steel wires that are
The performance of the wire during forging depends largely on its chemical makeup. The standard dictates strict ranges for carbon (C), silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S). Percentage Carbon (C) 0.080 - 0.130% Silicon (Si) 0.100 max% Manganese (Mn) 0.300 - 0.600% Phosphorus (P) 0.030 max% Sulphur (S) 0.035 max% Aluminium (Al) 0.020 min%
Many engineers confuse JIS G3539 with similar standards. Here’s a quick comparison: The standard dictates strict ranges for carbon (C),
: The cold-working process improves the grain structure, making the final fastener stronger. 🛠️ Technical Specifications
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