Posted by ScottyHOMEy on October 01, 2009 at 03:53:24 from (70.105.228.113):
In Reply to: Metric Bolt Size posted by throop on September 30, 2009 at 17:54:50:
I went through this exercise a couple of months ago. Replaced a brake caliper on my Ram. It bolted right up to the chassis just fine. Apparently there are two variations of caliper for this truck. The problem was with the banjo bolt holding the line fitting to the caliper.
The reman caliper was tapped for 3/8"-24 (NF). The original was metric 10-1.0 Close but no cigar. That 1.0 thread on the banjo bolt was CLOSE to a 24 pitch, and the 10mm just enough larger than 3/8", that it would seem to start in okay, but start to bugger up and jam after just about 3/4 turn. A quick check with a 3/8"NF bolt I had laying around was just enough smaller in the fitting to convince me that the difference was more than I wanted in a critical system like my truck brakes. I went back and got the correct caliper. The banjo bolt was probably okay, long enough that chasing off the slight damage to the threads at the end likely wouldn't have hurt a thing, but I replaced it, too.
In short, there may be one or two bolt sizes in the universe of such things that would give you a direct fit between metric and English, but yours isn't one of them.
You don't say what you're working on, but if it's not a specialty item, metric bolts are easy enough to come by. Any hardware store with the aisle full of the racks with the little drawers of nuts, bolts, washers, shelf brackets, springs, clevis pins . . . should have a decent assortment.
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