Iron 4 1/2" NH / NST Fire Hydrant Cap

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Regular price Price: $73.34
Regular price $0.00 Sale price $73.34
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Stock Level: 10 or more

Product Status: In Stock

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Shipping Cost: Free on orders over $100

Shipping Transit Time: 2 to 5 Business Days

Eligible for Express Shipping: Yes

Stock Level Updated: Oct 14, 2024


Item Number: FHC45
Weight: 7.45 lb
  • Cap Threads: 4 1/2 inch NH / NST
  • This Cap Will Only Connect to a 4 1/2 inch NH / NST Fire Hydrant
  • Material: Iron
  • Color: Red
  • Supplied with Chain and Ring
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Description

Heavy duty 4 1/2 inch replacement iron fire hydrant cap with NH / NST threads including chain. Pentagonal in shape.

The most common size and threads for US fire hydrants is 4 1/2 inch NH / NST. Outside diameter of a 4 1/2 inch male NH / NST adapter - 5 3/4 inches (5.760) - 4 threads per inch. Inside diameter of the waterway is about 41/2 inches.

Specifications

4 1/2" Male Fire Hydrant

  • Outside diameter of a 4 1/2 inch male NH / NST adapter: 5 3/4 inches (5.760) - 4 threads per inch

Help Me Connect

NH / NST: The most common thread type in use by fire departments today is NST or National Standard Thread. NST also goes by the initials NH or National Hose. It can even be referred to as NHT or National Hose Thread but NST or NH is more common these days. NH = NST.

  • The female side of a NH / NST coupling will only connect to a male NH / NST connection
  • The male side of a NH / NST coupling will only connect to a female NH / NST connection

NPSH: National Pipe Straight Hose (NPSH) or Iron Pipe Thread (IPT) has the same threads per inch (TPI) as National Pipe Tapered (NPT) but the thread does not taper. NPSH is a straight thread and seals by a gasket in the female coupling which allows for a swivel, just like NH / NST, which make both ideal for hose couplings.

  • The female side of a NPSH coupling will only connect to a male NPT pipe or a male NPSH connection
  • The male side of a NPSH coupling will only connect to a female NPSH connection
  • It will NOT thread into a female NPT pipe. For example, a male NPSH coupling will NOT thread into a female metal or pvc pipe.

NPT: National Pipe Tapered is common in plumbing and some industrial uses. Sometimes referred to as pipe thread because PVC pipe and schedule 40 pipe are typically threaded in NPT. As its name implies this is a tapered thread so that the outside diameter of the male (ODM) gets smaller towards the end of the fitting and the inside diameter of the female narrows with depth. As the two fittings are threaded together the opposite tapers force thread friction and makes the seal without the use of a gasket.

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