Zinc plated. Looking for a strong and heavy-duty fixing when working with timber? These coach screws are tough, reliable and easy to use - with a sharp tip and coarse thread, they're easy to insert for a firm and secure fit, and the traditional hexagon head allows you to achieve even greater torque with a socket driver.* Single thread screws for a strong, heavy-duty fixing* Hexagon head for greater torque with a socket driver* Perfect for fixing to timber in fencing and joinery applications* Zinc-plated for even greater durability Unbranded Coach Screw M10 x 40 (10 Pack) in Silver Forge 10CS1040 Coach Screw Hexagon Head Single Thread ZP M10 x40mm Bag of 10 These Forgefix single thread Coach Screws are Zinc plated forincreased... These Forgefix single thread Coach Screws are Zinc plated for increased corrosion resistance. Their hex head enables higher torque capability when tightening, and increased speed of use with socket drivers. These Coach Screws conform to DIN 571 standards. APPLICATION Used widely in heavier timber installations and for fixing timber to masonry. Also popular as a fixing for satellite dish installation together with a rimmed or rimless wall plug. Zinc coatings prevent oxidation of the protected metal to create a longer lasting finish. It does this by forming a barrier and by acting as a sacrificial anode if this barrier is damaged. Zinc oxide is a fine white dust that (in contrast to iron oxide) does not trigger a breakdown of the substrate&rsquos surface integrity. Single thread screws have been designed to offer higher pull out values and quicker insertion. Coach Screw Hexagon Head Single Thread ZP M10 x 40 Bag 10