One of the things we always seem to need is standoffs. This 210-piece brass standoff kit ensures you'll always have a set handy. Covering two of the most popular screw sizes used with PCBs and different standoff heights, it's a perfect addition to your benchtop or tool drawer.
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Question: With standard 0.1" pin headers, the male header (e.g. https://www.sparkfun.com/products/12807) has 2.54mm of plastic, and the female header (e.g. https://www.sparkfun.com/products/11894) is 8.5mm tall. So if you connect two boards using pin headers, the space between them will be 11mm, right? But for some reason, it's hard to find 11mm standoffs; 10mm is a much more common size. Why?
Well, 11mm is just a hair under 7/16", so maybe go with inch-based standoffs for that situation? (Unfortunately, SparkFun only seems to carry 3/8" and 3/4" heights for their #4-40 standoffs.) I'd suggest using 1/2" in lieu of the 7/16", as there's plenty of pin/socket and the extra 1/16" gives you a bit of tollerance if the headers aren't fully seated before soldering.'
What is the thread size of your 210 piece standoff kit, KIT-24115?
Even though I'm not a SF employee, I'll answer the question: There are two sizes in this kit, BOTH METRIC: M2.5 and M3, indicating 2.5mm and 3mm diameter screws, respecively.