M5 Heavy Duty Flat Washer (DIN 7349) - A4 Stainless Steel Heavy Duty Flat Washers are thicker than an average washer as well as tougher and resistant to corrosion. They are manufactured for heavy duty jobs and often used with bolts and heavy type spring pins. These Heavy Duty Flat Washers are made from A4 Marine Grade Stainless Steel which provides corrosion and oxidation resistance as well as increased resistance in harsh chemical and outdoor environments. For larger quantities or items not listed, please email and one of our team will provide you with a quotation. M5 Heavy Duty Flat Washer (DIN 7349) - A4 Stainless Steel