M4 x 40mm Hexagon Setscrews (DIN 933) - High Tensile Steel 8.8 Zinc Plated Hexagon Setscrews are very versatile screws, which are tightened and loosened with a spanner matching the head diameter (across the flats). Their Hexagonal Head allows for a great amount of torque to be applied, making them ideal in heavy duty applications. Hexagon Setscrews, have a fully threaded shaft, right up to the head, whereas Hexagon Bolts are only partially threaded. The full thread allows them to be used in a multitude of situations without fear of running out of thread. These Hexagon Setscrews are made from 8.8 High Tensile Steel, and coated in a Bright Zinc Plating which provides a level of corrosion and oxidation resistance. For larger quantities or items not listed, please email and one of our team will provide you with a quotation. M4 x 40mm Hexagon Setscrews (DIN 933) - High Tensile Steel 8.8 Zinc Plated