The NUMBER in the SAE size, is the size of the tube the fitting fits in 1/16 of an inch. SAE #6 is 6 X 1/16 = 3/8 inch. SAE #8 is 8 X 1/16 = 1/2 inch. There are O-Ring and flare fitting in the SAE/JIC standard. The angle of the flare is 37 degrees which is different than the 45 degree used on copper and I think the double flare like what is used on steel brake lines. The threads on these fittings are a fine thread. SAE #6 is 9/16" X 18 thread I think. I can not find my hydraulics catalog to check. These fitting are know by some around the racing community a AN fitting because all of the old WWII surplus hydraulic fitting, which are the SAE/JIC standard, were marked AN for Army/Navy. JIC goes as big as at least SAE #24.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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