M8 Fully Threaded Cap Screws A2 Stainless Stee l. These M8 cap screws are all fully threaded. M4,M5,M6,M8 A2 Stainless Steel. M5,M6,M8,M10 A2. M3, M4, M5, M6, M8. Manufactured from A2 grade stainless steel for improved corrosion resistance.