Feature: 1. Austenitic Stainless Steel: Made of good quality A2‑70 stainless steel, which is usually called 304 or 18/8 because of contains 18% chromium and 8% nickel, which is an austenitic stainless steel, almost non magnetic 2. Corrosion Resistant: A2‑70 spring lock washer is the most commonly used grade, 70 represents a tensile strength of 700N/mm², easy to clean and corrosion resistant 3. For Many Different Industries: Spring washer is suitable for a wide range of applications in many different industries, such as car body panels and bumpers in the automotive industry, food industry and catering industry, and also commonly used in engineering industry and construction 4. For DIY Jobs: Spring split washer is also favored by remote control and model making enthusiasts, which is favorite for many different DIY jobs at home or inside and outside of the garage, suitable for jobs that cannot be done with standard BZP fasteners 5. Good Surface Treatment: Generally speaking, A2‑70 washers are very suitable for various purposes in indoor or outdoor applications that require a good surface treatment, can effectively protect the screw from slipping Specification: Item Type: Spring Lock Washers Material: A2-70 Standard: DIN 7980 What Is A2 Stainless Steel? A2 stainless is commonly referred to as 304 or 18/8 because it contains 18% chromium and 8% nickel. A2 is an austenitic stainless steel and is almost non magnetic but will still stick lightly to a magnet due to the cold working process. A2-70 is the most commonly used grade, the 70 represents a tensile strength of 700N/mm2. A2 is suitable for a wide range of applications in alot of different industries such as the automotive industry in applications such as body panelling and bumpers etc, the food industry and catering due to its ease of cleaning and corrosion resistance, also commonly used in the engineering industry and architecture, A2 is also favoured by the remote control and model making enthusiasts. Also a favourite for many different DIY jobs in and around the home and garage for those jobs where a standard BZP fastener will not do. In general A2-70 is ideal for a whole range of uses where a good finish is needed on an interior or exterior applications.. Package List: 150 x M4 Spring Lock Washers