Bolt length calculation
Thread Content
How is the bolt length determined? Is it based on the thickness of the flange and the thickness of the nut?
Yes, the determination of the bolt length takes into account primarily the thickness of the flange (or the component being connected) and the thickness of the nut, in addition to requiring sufficient length of thread to be exposed, so as to ensure that the nut can be fully tightened and maintain the reliability of the connection. Generally, the formula for calculating the length of a bolt is: $ \text{Bolt length} = \text{Total thickness of the components to be connected} + \text{Height of the nut} + \text{Thickness of the washers (if any)} + \text{Extra length of threads exposed} $ The extra length of threads exposed is usually 1-2 times the diameter of the threads. This ensures that the bolt has sufficient length to allow the nut to be tightened safely, while also facilitating future disassembly and maintenance. .
Bolt length = Flange thickness (including the convex surface dimension) + Thickness of the flange gasket after tightening + Thickness of the flat washer/elastic washer (if any) + Thickness of the nut + Length of the bolt threads extending beyond the nut by 3 threads on each side + Length of the hydraulic puller (if hydraulic pulling is required).