Standard black pipe fittings for natural gas are made from malleable iron and are made for 125 psi. The same fitting is made in extra heavy wall thickness are rated to 300 psi. You can pound on these fittings with a hammer and they will bend but won't break. The same fittings are also available in cast iron and used mainly for heating systems. A good smack with a hammer will crack them. These type of threaded and socket weld fittings are also made in forged steel and can handle pressures in the 3000 pound range. I would not use standard malleable fittings on a hydraulic pressure line
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Today's Featured Article - Fordson Model N: Field Service Operations and Lubrication - by Anthony West. The daily or weekly servicing of any vehicle is of the utmost importance, and in days gone by when our favorite tractors were doing an important and Commercially vital job on the farm, these service operations would make a major difference to the running costs and economy of the farm. This being so, it surprises me to see how many enthusiasts attending rallies, shows etc, seem to be unaware of the importance of this constant attention. Possibly the modern machine with its 6,000 mile or even once
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