![]() The real answer is 2.66 kips!īut how is that possible? The answer lies in the physics of a bolted connection. Ok, I know, a bolt holds two or more things together, but how? Basic Principle of Bolted Connectionsįirst we need to look at what a bolt actually does. When you tighten a bolt, you are actually stretching it. ![]() Remember, a screw is a simple machine, and applying a torque to the bolt causes the bolt to tighten. The items being bolted are being compressed.Īs it tightens, 3 key things are happening.The load on the threads at the nut is increasing (both on the bolt and nut), increasing the normal force on the threads, and increasing the frictional resistance.These are some of the key factors when designing bolted connections. So if the bolt is being stretched, there’s obviously a load on the bolt. =75% of proof load for non-permanent connections, reusable fasteners As a rule of thumb, you can use the following How much pre-load the bolt should have varies depending on what exactly is being bolted together, and the intended use. =90% of proof load for permanent connectionsĪnd of course, proof load is merely the tensile area of the bolt multiplied by the proof strength. ![]() WARNING: This is probably one of the most variable conditions when designing a bolted connection.
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