M5 x 40mm Socket Countersunk Screws (DIN 7991) - A4 Stainless Steel Socket Countersunk Screws feature an internal socket drive and are fastened with a Hexagonal\/Allen key. The slanted neck and flat top allow for Socket Countersunk Screws to lay flush with the fastened surface or raised when paired with a Cup\/Countersunk Washer. These Socket Countersunk Screws 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 x 40mm Socket Countersunk Screws (DIN 7991) - A4 Stainless Steel