DIN 7991- A2 Stainless Steel. Thread Diameter - 5.0mm.
Socket Wrench Size - 3.0mm. A4 Grade is also known as marine grade stainless steel due to its increased resistance to chloride corrosion compared to type A2. We are UK registered company and a. Please allow slightly longer for weekends and national holidays. Please fill out all the necessary information on this page and also give as much additional information as possible as to why you wish to return this item.