SAE threads are TOTALLY different frm pipe threads.
SAE threads have the same size and # of threads per inch as fine thread bolts. They seal with an O ring. SAE 6 is 3/8 inch and SAE 8 is 1/2 inch. Much less likely to leak than pipe threads.
Pipe threads are tapered and seal by metal to metal contact when tightened down (if you are lucky).
The two types cannot be interconnected without adapters, which fortunately are readily available. Surplus Center has many of them.
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Today's Featured Article - Product Review: JB Weld - by Staff. JB Weld is basically an epoxy glue that does an exceptionally good job of bonding to cast iron and steel along with several other materials. As I mentioned, it is so common that I have yet to buy a tractor that did not have JB Weld used somewhere. It is sometimes used so well you can't tell its there and other times used as a sloppy quick fix. Finding where and how it can be used correctly is key to whether you are using it as an "inelegant hack" or an integral solution to difficult and expens
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