WARNING: This is probably one of the most variable conditions when designing a bolted connection.
=90% of proof load for permanent connectionsĪnd of course, proof load is merely the tensile area of the bolt multiplied by the proof strength. =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. So if the bolt is being stretched, there’s obviously a load on the bolt. These are some of the key factors when designing bolted connections.
Let’s assume that a 1/4-20 bolt will yield at a tensile load of 2.85 kips.
From massive structural steel joints that make up the Golden Gate Bridge to the intricate inner workings of an antique swiss watch, bolted connections dominate our world. You can see them just about everywhere you look.