We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Small hexagonal malleable iron pipe coupling with female NPT threads

Value Brand

Value Brand 5P549 Coupling 1/8" FNPT Malleable Iron Class 150

SKU CH-8GK5-V5M3D

A 1/8 inch FNPT malleable iron coupling rated Class 150 for joining threaded pipe

  • 1/8" FNPT threads connect small-bore piping reliably
  • Malleable iron body resists cracking under mechanical stress
  • Class 150 rating handles standard low-pressure service
  • Zoro Select brand identifies the manufacturer clearly
  • Model 5P549 simplifies reorder and inventory tracking

1/8" FNPT Malleable Iron Coupling

This Value Brand coupling connects two 1/8 inch female NPT threads in plumbing and compressed-air systems. The malleable iron body provides mechanical strength for industrial and commercial installations. Class 150 rating suits standard low-pressure piping networks. It is intended for installers who need a straight-threaded joint without flared or compression ends.

Class 150 pressure headroom

The Class 150 designation indicates the fitting handles typical residential and light-commercial water, air or inert-gas pressures. It comfortably serves branch lines, instrument taps and gauge connections where surge pressure stays within the class limit. The coupling runs out of margin in high-pressure hydraulic circuits or steam mains that exceed the class rating. Installers should verify system design pressure against the class before specifying this part.

Thermal and installation characteristics

Malleable iron conducts heat evenly, so the coupling reaches fluid temperature quickly without creating local hot spots. Thread engagement produces a metal-to-metal seal that does not rely on rubber gaskets, eliminating degradation from temperature cycling. Normal tightening torque draws the joint up without distorting the iron, keeping leak paths closed under vibration. No external power or active cooling is involved; the fitting is passive once installed.

Highlights

  • 1/8" FNPT threads connect small-bore piping reliably
  • Malleable iron body resists cracking under mechanical stress
  • Class 150 rating handles standard low-pressure service
  • Zoro Select brand identifies the manufacturer clearly
  • Model 5P549 simplifies reorder and inventory tracking

Specifications

BrandZORO SELECT

Questions about this item

Will the 1/8" FNPT threads on this Class 150 malleable iron coupling match the existing 1/8" FNPT threads on my older iron piping?

Yes, both ends are 1/8 in Female NPT with 27 threads per inch, so they will thread directly onto matching male NPT pipe nipples or fittings you already have.

How can I confirm the coupling is sealed properly after I install it?

Pressurise the system to its working limit and check each joint for leaks; a correctly threaded and sealed NPT connection will hold pressure without weeping.

Does the box include pipe thread sealant or tape, or do I need to buy that separately?

The coupling is supplied alone; you must purchase thread sealant or PTFE tape separately to make the NPT joints watertight.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.