Fire Hydrant Threads

The hydrant outlets usually have male national standard threads nst to mate with fire hose couplings.

Fire hydrant threads.

The impressions on the paper give the number of threads per inch tpi. The larger out lets sometimes called the steamer nozzles or connections are 4 inch or 4 5 inch nst. 4 1 2 m v o. X 4 tpi threads per inch.

Assured flow s hydra eze compound is a premium synthetic food grade non drying thread sealant and anti seize compound formulated with a balanced blend of ptfe and other lubricating solids homogenized into a non melting grease carrier. 3 you may also use this same method to determine the outside diameter od of a hose. Both the odm and tpi are needed. Fire hydrant having barrel thread dimensions of 8 250 o d.

Anti seize lubricant for fire hydrant hose nozzles. The smaller outlets sometimes called the hose nozzles or connections are 2 5 inch nst. Seat ring removeable without removing lower barrel. Hydrants have 5 1 4 bonnets upper barrels safety flanges and lower barrels and are marked 5 1 4 even though the main valve opening is 4 1 2.

Dia thds inch ns national standard follows nst also nh 2 5 7 5 4 5 4 austin tx ns 4 6 charlotte nc ns 4 6 chicago il 4 5. Fire hydrant connections carry hose pumper hose city nom. Qrfs carries a wide range of fire hose adapters designed to join fire hose fire hydrants and fire department connections with incompatible thread standards. Most fire hydrants have two 2 5 inch hose connection outlets with 7 5 threads per inch tpi and one 4 5 inch pumper connection outlet with 4 threads per inch.

If only a worn thread is available send the male fitting to national fire equipment ltd for an accurate. Our stock of 1 1 2 and 2 1 2 brass adapters features nst npsh and npt threaded fittings in configurations including male x male female x male and female x female.