![]() Coarse Threaded bolts have lower thread count than the other types are very common in general purpose applications. The thread pitch can be further categorized into coarse (or standard), fine and super fine (or extra fine) threads. ![]() In metric system, the distance between two adjacent threads in millimeters is considered as the Thread Pitch. In imperial system, the thread pitch of the bolt is determined by the number of threads in one inch. Thread Pitch is an important dimension associated with a Bolt. If the bolt is partially threaded, then the thread length can also be measured. The body length of the bolt is measured from the tip of the bolt to the point where the shank meets the head. The diameter of the Bolt is the actual size of the bolt and it is measured across the bolt shank or the threaded area. The Bolt Body consists of the main shank with full or partial threads. The size of the head is dependent on the shank’s nominal diameter.īolt head can have three important dimensions. The head of the bolt is usually hexagonal shape (sometimes square or circular) and is used to tighten or loosen the bolt. The following image shows a typical hex bolt with all the important dimensions marked on it.Ī bolt can be divided into two parts: Bolt Head and Bolt Body Bolt Head Some of the more common and popular types of bolts are:īefore looking at the Bolt Size Chart, let us first try to understand different proportions and dimensions associated with a bolt. It is often black in color due to additional black oxide coating.Īs Bolts and Nuts are one of the commonly used fasteners, there are different types of bolts for different types of applications. The result is a bolt with very good strength, corrosion resistance and wear resistance.
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