Complete Guide to Bolt Calculation- Size, Grade, Preload and Thumb rules
In this video, I have explained everything you need to know about bolts, nuts, screws, and washers. You will learn how a bolted connection actually works, the difference between a bolt and a screw, and how much thread engagement depth is enough. I also explain whether washers increase bolted joint strength or not, and the real reason why washers are used in mechanical design.
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This video also covers:
Why bolt preload is necessary and how it reduces fatigue stress.
How to calculate bolt preload for a given application.
Different bolt grades (like 8.8, 10.9, 12.9) and how to choose the right grade.
Bolt sizing calculation for tensile and shear loading.
How to calculate bolt size under dynamic loading conditions.
I have explained these topics with real industrial design examples, so you can clearly understand how engineers apply them in practice.
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As designers, we don’t always need complex calculations, most of the time we rely on simple thumb rules and experience.
That’s why I also share four easy thumb rules for bolt sizing that every mechanical design engineer should know.
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So, If you are an engineer, designer, or student who wants to master bolted joint design, preload calculation, and bolt sizing, this video will give you both the fundamentals and the practical approach used in the industry.
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Time stamp
00:00 – Importance of Bolt Sizing in Mechanical Design
02:47 – What You Will Learn in This Video
05:22 – Bolt vs Screw | Key Differences Explained
08:02 – Screw Thread Depth | How Much Engagement is Enough
11:53 – How a Bolted Connection Actually Works
12:59 – Importance of Bolt Preloading
13:56 – Bolt Preload Calculation Step by Step
19:11 – Washer in Bolted Joints | Function and Misconceptions
21:39 – Bolt Sizing Calculation | Complete Overview
25:29 – Bolt Sizing in Tension Loading
26:24 – Bolt Grades (Metric) and Their Selection
31:54 – Factor of Safety in Bolt Sizing
35:00 – Bolt Sizing in Shear Loading
42:03 – Four Simple Thumb Rules for Bolt Sizing
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