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mz machanics 600x80 Son of Know Your Bolts

boltimage 4 Son of Know Your Bolts

In the comments on yesterday’s piece about Bolt Depot’s poster of fasteners, a reader, JamesB, wrote:

I would encourage budding young fabricators to also take a look at the bolt grade charts and get an inexpensive universal thread gauge. For found fasteners, the grade markings help differentiate metric from SAE, and the thread gauge helps separate the coarse from fine. After you twist the heads off some inexpensive fasteners, the need for the higher grades becomes apparent pretty quick.

Bolt Depot has a decent printable chart (which links to a deeper database) of common bolt grades, sizes and what their head markings look like. Here’s the link to that page:

Bolt Grade Markings and Strength Chart

Know Your Bolts Redux
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Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.

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