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What Do Screw and Bolt Head Markings Mean?

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M5 & M8 Military bolts

If you’ve ever spent time looking at different screw and bolt heads, you’ve probably noticed that there are a wide variety of markings that are stamped on them. The markings can be numbers, letters, slashes, dots, or an assortment of other marks. If you’ve ever wondered what those screw and bolt head markings mean, or … Read more

Proof Load, Yield Strength, and Tensile Strength of Fasteners

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wedge-tensile-test
In the fastener world, you’ll often hear terms like proof load, yield strength, and tensile strength tossed around when referring to the strength of a given fastener. For those unfamiliar with the precise meanings of these terms, I thought I’d devote a blog post to help define them and their relation to one another. Proof ... Read more

The Difference Between 1A, 2A, and 3A Threads

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2A threads vs. 3A threads

When it comes to screws, bolts, and other threaded fasteners, precision and accuracy are critical. Engineers and manufacturers rely on standardized measurements and classifications to ensure seamless assembly and optimal performance. In Part 1 of our Threads Series, we provided some terminology and explained some of the nomenclatures of Unified Inch series threads. Now, we’ll … Read more