Having worked on both farm and construction equipment most of my life I"ve got to say I agree with the reply saying the bolts in the kits will usually stay there while the empty slots will fill up with stuff you actually need. Well, may be it"s not quite that bad but even though the actual bolt sizes and thread pitches used on most machines are common they also use alot of lengths that are not included in the standard kits. By that I mean is most kits break their lengths down in 1/2 inch increments and for the most part these bolts can be used as long as there is clearance. On the other hand alot of the bolts used are needed in 1/4 increments (ie 1 1/4 long vs 1 1/2 long). If your putting a bracket on a block, etc where there is a blind hole and it"s not deep enough, your out of luck unless you can cut the end off of the longer bolt. Then you"ve got to worry that the grip length (unthreaded part) isn"t so long that it hits the threads before the bolt gets tight. You"ll usualy find this problem more prevelant in the smaller sizes, say 1/2 down but it can come into play with the larger stuff too on occasion. As far as finding the 1/4 inch increments assortments I"ve never seen it in anything off the shelf. Short of going through an industrial supplier that lets you make up the mix of fasteners offered in one of their large shop sized setups I don"t know where you"d get anything with that mix without making it up yourself.
Once you get past the standard stuff then you get into the metric and it"s even worse. With that mess you"ve got not just the lengths and thread pitches to worry about but also the head size of the bolt. For instance the same thread and pitch from one mfg might have a 14 MM head on it and from another it might have a 17 MM head on it. Then thrown in the fact they also like flange head bolts, which are often the same way, and it becomes a real nightmare.
In the end all I can say is get on the boards specific to the brand tractors you have and ask if any mechanics can tell you the most common sizes they encounter on that particular brand. For instance I know IH like"s 7/16, Detroit Diesel loves 3/8 fine thread bolts in odd lenghts, etc, etc. Figure out the most common sizes and set up something on your own as ultimately you"ll save money over buying an off the shelf kit with parts you"ll never use.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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