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Galvanized carbon steel pipe nipple, 18 inches long, threaded both ends

Value Brand

Value Brand 566-180GR 1-1/4" MNPT x 18" Sch 40 Pipe Nipple

SKU CH-MMZ8-8EAQA

A galvanized carbon steel pipe nipple with 1-1/4 inch MNPT threads on both ends, 18 inches long, Schedule 40 wall thickness of .14 inches, rated for 1145 psi at 650 degrees Fahrenheit

  • Galvanized steel resists corrosion for long service life
  • Schedule 40 wall thickness of .14 in handles 1145 psi at 650 °F
  • 18 in length with MNPT threads on both ends simplifies installation
  • Electric resistance weld construction meets ANSI B1.20.1 Class 150 standards
  • 38 in inside diameter maintains strong flow capacity

1-1/4" Schedule 40 Pipe Nipple

This 18-inch carbon-steel nipple is threaded on both ends with MNPT connections and built to Schedule 40 wall thickness. It suits plumbing, hydraulic and industrial piping jobs that require a straight, rigid link between two female-threaded fittings. The galvanized finish resists corrosion in water, air and oil lines. Installers who need a fixed-length connector for 1-1/4-inch nominal pipe will find it matches the required dimensions.

Threaded MNPT interface limits

The male NPT threads seal by taper engagement, so joint integrity depends on proper thread compound or tape and correct tightening torque. Maximum rated pressure is 1145 psi at 650 °F, but the rating drops as temperature rises above that point. Electric-resistance-welded construction meets ANSI B1.20.1 Class 150 standards, yet the welded seam remains the potential leak path if the system exceeds design pressure or suffers vibration fatigue. The 0.14-inch wall and 1.38-inch inside diameter fix the flow capacity and pressure envelope.

Pre-installation checks

Verify that the mating female threads are also NPT and match the 1-1/4-inch nominal size; mismatched thread forms will not seal. Confirm the system design pressure and temperature stay within the 1145 psi at 650 °F envelope, including any transient spikes. Ensure the 18-inch overall length fits the layout without requiring field cutting, which would remove the factory threads. Check that the 1.66-inch outside diameter clears surrounding structure and insulation.

Highlights

  • Galvanized steel resists corrosion for long service life
  • Schedule 40 wall thickness of .14 in handles 1145 psi at 650 °F
  • 18 in length with MNPT threads on both ends simplifies installation
  • Electric resistance weld construction meets ANSI B1.20.1 Class 150 standards
  • 38 in inside diameter maintains strong flow capacity

Specifications

BrandZORO SELECT

Questions about this item

Should I choose the 18-inch length or a different size for my 1-1/4" Schedule 40 piping?

The 18-inch overall length suits runs needing that exact span; other lengths exist but are separate items, so match the measured gap between fittings before ordering.

What does the 1145 psi rating mean once the nipple is threaded into my system?

It is the maximum working pressure at 650 °F; at lower temperatures the same Class 150 fitting can handle higher pressure per ANSI B1.20.1 limits.

How does the MNPT threading on both ends affect what I can connect?

Male NPT threads on each end mate with female NPT fittings — valves, couplings, or equipment ports — creating a tapered seal that meets ANSI B1.20.1 Class 150 standards.

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