M8 Hex Bolt/Setscrew Fully Threaded 
 Dimensions - M8 x 40 Bolts 
 Here is what the dimensions mean… 
 M - Metric thread 
 8 - Diameter of the bolt, in millimetres 
 40 - Length, in millimetres (from the base of the bolt head to the end of the thread) 
 Material 
 Zinc Plated Steel - A Corrosion-Retardant plating provides protection from external elements and extends the life of the metal used to make these M8 40mm bolts. 
 Specification 
 M8 Bolts 40mm 
 DIN933 Grade 8.8 
 Available in a variety of sizes; 
 M8 x 25mm, M8 x 30mm, M8 x 40mm, M8 x 50mm