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 Fittings with Pipe Threads
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Fittings with Pipe Threads
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A great number of Russell Adapter Fittings have pipe threads on them. Many of the engine components that are plumbed utilize pipe threads. Some examples would be the heater hose connections in the water pump and intake manifold. Many fuel system components are also equipped with pipe threads, items such as fuel pressure regulators, fuel filters, fuel tanks, fuel blocks and similar items. Some aftermarket fuel pumps are also equipped with pipe threads on female ports but many pumps, particularly stock pumps, utilize straight threads with an inverted flare. Russell makes a complete line of special fittings with inverted flares for use with these fuel pumps.
While on the subject of pipe threads, we need to pass along that the nomenclature used for specifying pipe thread sizes can be quite confusing to those not familiar with pipe terminology. When a pipe thread size is given, such as 3/8" NPT (National Pipe Thread), the 3/8" refers to the inside diameter of the pipe.
| Since pipe has quite a thick wall and the threads are cut on the outside diameter of the pipe, the actual thread O.D. is much larger than 3/8-inch. For example, the nominal outside diameter of a 3/8" pipe thread is about 5/8-inch. See the referring photo to identify pipe thread sizes. And remember that pipe threads are cut on a taper. This is so that as you tighten two parts together the connection between the threads gets tighter and tighter. This is to lessen the chance of leaks. To completely eliminate leaks it's always a good idea to use a thread sealing compound or TeflonÆ tape on pipe threads. |  |
| Teflon tape not only acts as a
sealant it also prevents galling between aluminum threaded components and allows for easy
disassembly if required. It's a good idea any time you are assembling any Russell aluminum hose end or fitting with a mating aluminum part that the threads be coated with an assembly lube, such as CRC, WD-40 or some type of silicone spray. This helps prevent galling the threads. |
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