![]() ![]() See the thread charts on this page for more information.Ī thread gauge can be used to identify bolts and nuts, although they are not in common usage. The thread pitch of an imperial bolt is denoted by the amount of threads per inch. Metric bolts are identified by measuring the distance between the threads - a 1mm pitch bolt has 1mm between the threads. If the bolt has a countersunk head, the full length of the bolt including head is measured. ![]() The length of a Hexagon bolt is determined by measuring from underneath the head to the end of the bolt. For example, a 4mm diameter bolt is commonly known as an 'M4' bolt. (Click on the image to enlarge) How to measure Measuring bolt diameterīolts can be accurately measured using a vernier.įor metric bolts, the prefix 'M' is added to denote Metric. T = 2d + 1/4" up to a length of 6", where the formula becomes t = 2d + 1/2". The thread length of UNC or UNF bolts manufactured to BS1768, with diameter d and thread length t, is: The drawing below shows unthreaded fasteners. The thread length of BSW or BSF bolts manufactured to BS1083, with diameter d and thread length t, is t = 2d. The thread length of Metric bolts manufactured to DIN 931 and 933, with diameter d and thread length t, is: ![]() Technical Information Dimensional Specifications DIN 931 & DIN 933 ![]()
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