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
Galvanized malleable iron union, half-inch FNPT, Class 150

Anvil

Anvil 1/2" FNPT Galvanized Union Class 150 300 psi

SKU CH-CM5W-QMKV8

Galvanized malleable-iron union with 1/2 in FNPT threads, Class 150 rated to 300 psi WOG at 150 °F and 150 psi steam at 350 °F, meeting ASTM A197 and ASME B16.36 with FM and UL listings

  • Galvanised malleable iron resists corrosion in water systems
  • Class 150 rating handles 300 psi at 150 °F for reliable service
  • FNPT threads create a tight seal without welding
  • FM approved and UL listed for code-compliant installations
  • Operates from -20 °F to 350 °F across steam and water lines

1/2" FNPT Galvanized Union

This Anvil union joins two lengths of 1/2 inch pipe with female National Pipe Taper threads. The Class 150 malleable iron body is galvanized for corrosion resistance and rated for 300 psi water, oil or gas at 150 °F and 150 psi saturated steam at 350 °F. It meets ASTM A197, ASME B16.36, FM and UL listings.

Replaces threaded couplings

A union allows the pipe run to be disconnected without turning either length of pipe. The jump is worth it when maintenance, equipment swap-out or future reconfiguration are expected. It is not suited for permanent joints that will never be broken or for systems that exceed the 300 psi WOG or 150 psi steam limits.

Class 150 pressure envelope

The fitting handles temperatures from -20 °F to 350 °F within the stated pressure ratings. Above 350 °F or beyond 300 psi WOG the Class 150 envelope is exceeded and a higher-class fitting is required. The galvanized coating is not intended for potable water lines where lead-free certification is mandated.

Highlights

  • Galvanised malleable iron resists corrosion in water systems
  • Class 150 rating handles 300 psi at 150 °F for reliable service
  • FNPT threads create a tight seal without welding
  • FM approved and UL listed for code-compliant installations
  • Operates from -20 °F to 350 °F across steam and water lines

Specifications

BrandANVIL

Questions about this item

What thread size does the 1/2" FNPT galvanized union need to connect to?

It connects to 1/2 inch FNPT threads on both ends, matching standard iron pipe threads for Class 150 fittings.

How is the union assembled, and what step is often missed?

Thread each nut onto its pipe end, then tighten the central nut to draw the faces together; the step often missed is ensuring the gasket seats flat before final torque.

What replacement part will be needed over time?

The internal gasket between the two union halves will need replacement if leaks appear after thermal cycles between -20 and 350 degrees F.

Also in this aisle

People compared these

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