Uploaded August 2026 | Updated September 2026, 2 weeks ago

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Why do bolts have six sides?

That familiar hexagonal shape may look simple, but it was designed around some clever engineering. The six-sided head gives a wrench something solid to grip while allowing it to be repositioned in tight spaces.

In this episode, we explore the history of bolts, how the hexagonal head transmits torque, why a round or square head isn't always ideal, how standardized sizes allow bolts and wrenches to work together, and why not all bolts are designed with hexagonal heads.

It's a simple piece of hardware—but there's more engineering behind it than you might expect.

Timestamps:
00:00 — Introduction
01:30 — The Main Job of the Head
02:18 — Why Six Sides Work So Well
03:05 — Why Not Make the Head Round?
03:47 — Why Do Bolt Heads Have Flat Faces?
04:08 — Why Wrenches Fit So Precisely
04:59 — Why Rounded Corners Help
05:39 — What Happens When You Tighten the Bolt?
06:26 — Why Bolts Aren't All Hexagonal
07:07 — Outro

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