Son of Know Your Bolts

Gareth Branwyn

Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. And he has a new best-of writing collection and "lazy person's memoir," called Borg Like Me.

4027 Articles

By Gareth Branwyn

Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. And he has a new best-of writing collection and "lazy person's memoir," called Borg Like Me.

4027 Articles

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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

More:
Know Your Bolts Redux
All of our Mechanics coverage

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