Dave Theisen wrote on Tuesday, October 31, 2000 (PST): The pitch is the distance from any point on a thread to the exact point on the next thread. It doesn't have to be at the crest. The pitch is equal to 'one divided by the number of threads per inch'. So if you have a 3/8-16 thread the pitch is '1 divided by 16' which equals .0625 inch. So in one revolution, the bolt will travel .0625 inch. Richard wrote on Wednesday, November 01, 2000 (PST): Also beware of counterfeit nuts and bolts. There are a lot of them out there and are dangerous especially in high tension applications. Chuck Rodman wrote on Saturday, November 04, 2000 (PST): I've wanted this information for years Very well written and to the point Paul Stanley wrote on Sunday, November 12, 2000 (PST): Thanks for all the info. A fellow on the Oliver page was looking for some special nuts for his cast hub to steel rim application. I happened to find a great web site on bolts and hardwae at www.e-fastener.com which linked me to a list of suppliers. I would recommend this site for anyone wanting a glossary of hardware, has technical questions, or needs to find a source for hardware Greg Robinson wrote on Tuesday, November 14, 2000 (PST): Perhaps it would be helpful to discuss the necessity of washers for the expansion of frustrum. Big Jim wrote on Wednesday, November 22, 2000 (PST): One comment I would like to make. Most of the older tractors use SAE fasteners exclusively. This is a real blessing since generally there are only two thread types-Coarse and Fine. Metrics are a real pain to work with, since there can be three four different thread pitches for thr same size bolt. Also metric bolt sizes are very close since one Millimeter isn't much. You can put the wrong size bolt in and strip out a hole in an expensive casting. Greaseman wrote on Monday, February 25, 2002 (PST): Very well written especially for the "good ol' people" who like to work on these buetiful machines. I especially love old Super C's. Fred OH wrote on Monday, January 19, 2004 (PST): The pitch equals 1 over number of threads per inch on a single lead thread (1/N)...there are multiple lead threads, such as 2 threads wrapping around the bolt...or 3. This is uncommon and just a FYI thing. Also there are left handed threads to mention...the only one that comes to mind is the little screw that holds a chuck on some of the reversible hand drills down inside the chuck...in case you ever wanted to change the chuck and couldn't get it off. Other kinds of threads that we as tool people might have to deal with are buttress or acme threads which you might find on an older vise. Generally speaking...if they are ever replaced and not available from the manufacturer...they are single point threaded on a lathe...both the internal and external threads. And if you feel you need more information on these type threads...may I suggest a four year hitch in uncle sam's canoe club (US Navy) where we occasionally cut double lead right and left handed acme threads. Fred OH

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