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Brass hex nipple, female NPT to male NST, straight rigid form

Value Brand

Value Brand Hex Nipple FNPT x MNST 2 in x 2-1/2 in coupling

SKU CH-NZH7-SMT21

Brass hex nipple connects 2 in female NPT to 2-1/2 in male NST threads for fire hose adaptation

  • Brass construction resists corrosion for long service life
  • Hex tightening allows secure installation with standard tools
  • Connects 2 in NPT female to 2-1/2 in NST male threads
  • Rigid straight design maintains alignment under pressure
  • California Prop 65 warning for cancer and reproductive harm

What this fitting does

This brass hex nipple connects a 2-inch female NPT thread to a 2-1/2-inch male NST thread. It provides a rigid, straight transition between fire-hose couplings and standard pipe threads. The part suits maintenance crews and installers who need a durable adapter for hydrant or pump connections.

Thread compatibility limits

The adapter only joins NPT and NST thread forms; it cannot mate with BSP, metric or other thread standards. Both ends are rigid, so no swivel or angular adjustment is possible once tightened. California Proposition 65 warnings apply because the brass contains listed chemicals.

Deciding specification

The critical detail is the mixed thread pairing: 2-inch female NPT on one side and 2-1/2-inch male NST on the other. If your system requires matching thread types or a different size combination, this nipple will not fit.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $29.99
Pricier than about 69% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

Should I pick the 2 in FNPT end or the 2-1/2 in MNST end for my hose line?

This coupling joins a 2 in FNPT female thread to a 2-1/2 in MNST male thread in one rigid brass fitting, so you use the end that matches the thread on each side of the connection.

What does the NPT x NST thread combination mean once the adapter is installed?

It connects a National Pipe Thread female fitting to a National Standard Thread male fire-hose fitting, creating a straight rigid joint between the two thread standards.

How does the hex tightening method affect the seal on these threads?

The external hex lets you apply torque with a wrench to seat the tapered NPT side and the straight NST side securely without rounding the fitting.

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