TIMco S1040SSP Hex Set and Hex Nut A2 SS M10 x 40mm Bag of 2. A fully threaded set screw used in a variety of applications. Manufactured from A2 Stainless Steel offering superior corrosion resistance, perfect for external applications. Stainless steel must be used where there is corrosive environment and/or the base material has inherent corrosive characteristics e.g. Green Oak. Nuts are included. Thread Diameter: M10. Length: 40mm. Head Type: Hex. Socket Size: 17mm. Thread Type: Metric. Material: Austenitic Stainless Steel (A2-304).