For demonstration only! The actual program may vary in look and content!

Fastener designs, though simple, does not seem straight forward to the beginners. There are many variables which influences design parameters, some of them are:
Pre-load Required This is the compressive force required to keep the members being clamped in contact, always!
Space available This will help determine the appropriate combination of Size and Material grade.
Usage Frequent Assembly/Dis-assembly will influence thread selection.
Surface Finish The roughness of clamped member will change friction coefficient between bolt head and nut faces.
Corrosion The design corrosion resistance requirement will decide the painting specification and friction coefficient between threads.
Hydrogen Embrittlement Brittleness that get developed in steel bolts due to penetration of hydrogen from atmosphere.

Click on the Image shown below to understand a sample calculation:

Bolt Calculation

The content on is being constantly refined and improvised with on-the-job experience, testing, and training. Examples might be simplified to improve insight into the physics and basic understanding. Linked pages, articles, references, and examples are constantly reviewed to reduce errors, but we cannot warrant full correctness of all content.