Hello all, I?ve ordered bolts drilled for castellated nuts several times now, and I?ve ended up ordering at least a couple that were the wrong length each time. So I pulled out my calipers and did some checking, and I ended up just drawing up a spreadsheet to help me get the right stuff the *first* time from now on. If such a resource already exists, then just ignore this. However, if you (like me) are confused about how grip and nominal length translate when you?re using a castellated nut, I?ve uploaded the spreadsheet and have a link on my blog so you can download it. It?s only got AN3 and AN4 calculated at the moment, but if anyone has other diameter drilled bolts that they want to measure and send me results, I?ll update the spreadsheet.
Matt Quimby kr2pilot.blogspot.com