DIYUK M20 A2 Stainless Steel Split Lock Spring Washer - DIN 127B - Pack of 10

Manufactured to DIN 127, Type B (square-end) - the long-standing industry reference for split lock washer sizing, even after the standard's formal withdrawal from the German DIN catalogue. Cold-formed from A2 (304-grade) austenitic stainless steel, resisting rust and general atmospheric corrosion far better than plain or zinc-plated carbon steel. Works through a dual mechanism: the coiled ring stores spring energy under compression, while the sharp, square-cut ends key slightly into the bearing surfaces - together resisting loosening under vibration. Stainless construction means there's no plating to wear through, so the washer can typically be reused across several assembly and disassembly cycles provided it hasn't been fully flattened. Not recommended for continuous saltwater or marine immersion, where an A4 (316) stainless washer holds up better against chloride pitting.