Hexagon thin nuts are standardized to ASTM A563 and are available in different grades. This allows for differentiation of the materials used in manufacturing them.
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Hex nuts are commonly used in assembly lines and are available in DIN, metric, and custom dimensions. Metric hex nuts are easier to install on a production line because they have a standard width of 1.2mm.
The most important thing to remember about your hex nut rack is that you only get one pair per package. So if you order a dozen of them, make sure you have a safe place to keep them.