There are various types of hardware fasteners and some of the most widely accepted of these are bolts.
There are also many distinctive types of bolts and one of which are coach bolts also known as Carriage bolts. They have a round head, more of a domed top with a square edge under the head.
Coach or Carriage bolts are frequently used for timber or wood or the construction projects where the use of timber and wood is extensive. The square section of the bolt clutched into the portion where it is being fixed and prevents it from spinning while the nut is twisted to tighten.
Coach bolts are manufactured with different materials. There are six universally used bolt materials and the first is the zinc plated steel coach bolts. Zinc plated steel bolts reasonably guard against rust in any given weather.
These bolts are available in different range of sizes and designs. The standard dimensions of coach bolts are generally described by these categories: Head and Body Diameter, Screw Depth and Length, Square width and Depth and Head Height.
The second material is the medium carbon steel also known as plain-carbon steel. The third metal used is the stainless steel 18-8. Stainless steel 18-8 has highest resistance to corrosion and is used for steamers or the types of structures which are frequently exposed to water and weather. The fourth material is the Silicon Bronze. These bolts are heavy-duty with rust resistance as compared to brass bolts. The last metal used is the Grade 5 chrome.
Carriage bolts are treated with anti-corrosion coating and undergoes stringent quality tests as per specified standard i.e. DIN: 603 to ensure resilience and better performance at user's end.