Metric Nut and Bolt Gauge
thingiverse
A nut and bolt gauge usually costs around $75. I bought all the nuts and bolts for this at my local hardware store for $7.50. What was a plastic bin of assorted hardware is now organized by size. Please note that the outer dimension of the nut or bolt head may not be the same as what is stocked by your hardware store. Sizes are 3x0.5 4x0.7 5x0.8 6x1.0 7x1.0 8x1.0 8x1.25 10x1.0 10x1.25 10x1.5 12x1.25 12x1.5 12x1.75.
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