M4 X 40 Countersunk Socket Set Screw A2 Stainless Steel PK10
Big Bear Bolts
£1.23
Also known as a flat-heat screw , a countersunk screw is a type of screw that's designed to rest flush with the object or surface in which it's inserted. They are called “countersunk screws” because they “sink” into objects and surfaces. A2 stainless steel is often referred to as 304 or 18/8 Stainless. 18/8 actually refers to the amount of chromium and nickel in the alloy – 18% chromium and 8% nickel. A2 (304, 18/8) is an austenitic steel and is non-magnetic . The chromium provides a corrosion and oxidation resistance, however it can tarnish. DIN7991
Big Bear Bolts's own words, read from their page.
Buy from BIG BEAR BOLTS LTDPrice seen 2026-09-26. Not an affiliate link, we earn nothing from it.






