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DIN603 A2-70 Stainless Steel Round Head Square Neck Carriage Bolt. Manufactured strictly in accordance with DIN603 industry standard. Unique square neck design prevents bolt rotation during tightening. Smooth mushroom round head, no sharp edges for safe installation. High tensile strength, stable mechanical performance. Multiple material options: carbon steel, A2-70, A4-80 stainless steel. Various surface treatments for anti-corrosion requirements. Complete metric size range from M6 to M20. Custom specifications are acceptable. Export-grade packaging, suitable for ocean transportation.