{"id":1460,"date":"2017-10-05T11:48:24","date_gmt":"2017-10-05T11:48:24","guid":{"rendered":"https:\/\/blog.normagroup.com\/?p=1460\/"},"modified":"2018-04-17T12:38:56","modified_gmt":"2018-04-17T12:38:56","slug":"what-is-breakaway-torque","status":"publish","type":"post","link":"https:\/\/blog.normagroup.com\/en\/what-is-breakaway-torque\/","title":{"rendered":"What is Breakaway Torque?"},"content":{"rendered":"<p>Everyone is familiar with it: This striking loud cracking while one loosens a screw. This cracking is called <em>breakaway torque<\/em>. But what exactly happens here?<\/p>\n<p><strong>The most important terms (in the text italic) as a quick overview:<\/strong><\/p>\n<p>\t\t\tBreakaway torque<\/p>\n<p>Breakaway torque occurs when an already installed screw is further rotated or loosened.<\/p>\n<p>\t\t\tPreload force<\/p>\n<p>The preload force results from the tightening of the screw.<\/p>\n<p>\t\t\tTightening torque<\/p>\n<p>The torque is applied while the screw is rotated until it is tight.<\/p>\n<p>\t\t\tPrevail torque<\/p>\n<p>The torque which starts after the breakaway torque is referred to as prevail torque.<\/p>\n<p>\t\t\tClamping force<\/p>\n<p>This is the force acting on a connection after assembly.<\/p>\n<p>\t\t\tStatic friction<\/p>\n<p>Static friction occurs when a body rests on another body. The movement of the body is prevented by static friction.<\/p>\n<p>\t\t\tSliding friction<\/p>\n<p>Sliding friction occurs when a body moves on another body. The movement of the body on the other body is inhibited by the sliding friction.<\/p>\n<p>There are many different ways to connect something. One of them is the screw. Our clamps also have screws on the housing to attach them securely and firmly to a hose or nozzle.<\/p>\n<p>First, the <em>tightening torque<\/em> is applied when, as the name implies, the screw is tightened. By that, the torque increases gradually and evenly until a predetermined tightening torque is reached.<\/p>\n<h2>The Preload Force and the Clamping Force<\/h2>\n<p>The screw, in conjunction with the housing and the belt, generates the<em> preload force<\/em>. Here, too, the process can be derived from the name: the screw exerts tension on the parts. In our case, the two parts are the steel band of our clamp and a rubber hose.<\/p>\n<p>The preload force must be calculated in such a way that there is sufficient <em>clamping force<\/em> in the case of our clamp. Therefore, the preload force must not be too low. In addition, it must not be too high, as parts could be damaged. Vibrations may also have to be considered so that in our case the clamp does not slip from the hose. This ensures, for example, the long service life of the connection in the engine compartment of a vehicle.<\/p>\n<p><strong>Clamping force of TORRO Clamp and V Profile Clamp shown in diagrams:\u00a0<\/strong><\/p>\n<p>Since the correct preload force is difficult to check, the tightening <em>torque<\/em> is specified for each connection. If the already mounted screw is turned further, breakaway torque will occur.<\/p>\n<p>The torque increases briefly above the tightening torque before the screw continues to rotate. This effect is explained by the transition from the <em>static friction<\/em> to the <em>sliding friction<\/em>. More precisely, the static friction is overcome at this moment.<\/p>\n<h2>What is Breakaway Torque Used for?<\/h2>\n<p>With our clamps, breakaway torque is determined in the development phase in order to ensure that sufficient clamping force \u2013 in addition to all existing requirements \u2013 is maintained. We do this in relaxation tests, for example. On this basis, we recommend the tightening torque and tightening speed that must be complied with to our customers.<\/p>\n<p>Compliance with these sizes ensures a long and reliable service life of the connection \u2013 even under partly extreme conditions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When a screw is tightened or loosened, various physical quantities are involved: preload force, tightening torque, and breakaway torque. Our expert explains what these terms mean and why they are so important. <\/p>\n","protected":false},"author":15,"featured_media":1590,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9],"tags":[],"class_list":["post-1460","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Breakaway Torque? - NORMA Group Blog<\/title>\n<meta name=\"description\" content=\"When a screw is tightened or loosened, various physical quantities are involved - like breakaway torque. 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