1/21/2024 0 Comments Mm actual size chart thanksThe higher the class number, the greater is the strength of the bolt. In the metric system, the strength of the bolt is determined using its class number, which is also printed on the head of the bolt. The ‘grade marks’ are nothing but radial lines and the more the number of lines on the head of the bolt, the greater the strength of the bolt. In USCS imperial system, the bolt’s tensile strength is represented using ‘grade marks’ on the top of the head. The tensile strength of a bolt is the maximum stress/stretch it can handle before it breaks. Grade or ClassĪnother important specification associated with bolts is their grade (imperial) or class (metric), which determines the tensile strength of the bolt. The size of the bolt head is used to determine the size of the wrench to tighten or loosen the bolt. When we say ‘size of the bolt’, it usually means the diameter of the bolt’s shank. IMPORTANT NOTE: People often confuse between the size of the bolt and the size of the bolt head. For precision applications and situations where you require more holding force, fine-threaded bolts are used. Coarse Threaded bolts have a lower thread count than the other types and 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. Common Types of BoltsĪs Bolts and Nuts are of the commonly used fasteners, there are different types of bolts for different types of applications. Therefore, some people also refer to a class of fasteners with existing national standards as standard fasteners, or simply as standard parts.īefore looking at the Bolt Size Chart, we will first try to learn about Bolts in general, some important identifications associated with Bolts, the method of measuring the Bolt’s Size, and many other things. It is characterized by a wide variety of specifications, different performances and uses, and a high degree of standardization, serialization, and generalization. Fasteners are used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemicals, metallurgy, molds, hydraulic pressure and other industries, in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments All kinds of fasteners can be seen on the chemical industry, instruments and supplies, etc., which are the most widely used mechanical basic parts. The Most Complete Thread and Bolt Size Charts What are fasteners?įasteners are a type of mechanical parts that are used for fastening connections and are widely used.
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