Not sure if that would work on the nuts.Ĭurious if anyone else has come across this, and how you deal with them. I suppose if the threads aren't too sloppy, I could put a set of calipers on the bolts and sort the two out by OD. I also assume that, if I had a decent length threaded bore, that the bolts wouldn't go in the wrong bore, although I don't have anything handy to try that out.
I assume there's enough slop in the threads, especially in a nut that doesn't have many, that it makes these two sizes appear to fit each others' bolts/nuts. I did the math, and a 1/4-20 works out to a M6.35-1.27. I noticed the other night that M6-1.25 bolts fit 1/4-20 nuts and vice versa. Now that it's been a few years and we've been through several cars that were exclusively metric, I have a fair amount of metric fasteners to sort. In the past, I've had drawers for standard fasteners, but I never had enough metric ones to justify their own drawers. Radial lines, such those used to mark SAE grades, are never used on metric bolts.So I'm sorting through my can of fasteners.
Fasteners smaller than M5, and those with slotted or recessed heads, whatever their diameter, need not be marked. Hex head bolts M5 and larger must have the property class marked on the head of theīolt, either in raised or depressed lettering.
Ratio between the minimum yield stress and the minimum tensile strength, times ten.
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