General description A4 grade stainless steel M12 spring washer DIN 7980 offers superior corrosion resistance compared to A2 stainless steel, making it ideal for marine applications, particularly in environments exposed to salt water. Technical specifications Grade: A4 (Type 316 S31) Outside diameter: 18 mm Material thickness: 2.5 mm Object thickness (including offset): 5-5.9 mm
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