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
Galvanised malleable iron locknut, 3/4 inch NPT thread

Value Brand

Value Brand 5P980 Locknut Malleable Iron NPT 3/4 in

SKU CH-A8S9-XE175

Malleable iron locknut with NPT threads for 3/4 inch pipe connections in Class 150 galvanized fittings

  • 3/4 in NPT locknut fits standard pipe threads
  • Class 150 rating handles typical plumbing pressure
  • Galvanized malleable iron resists corrosion in wet systems
  • Zoro Select brand identifies the manufacturer
  • California Proposition 65 warning notes chemical exposure risk

Locknut for 3/4 in NPT piping

This galvanised malleable iron locknut fits a 3/4 in nominal pipe size with NPT threads. It is intended for plumbing installations that require a secure mechanical joint. The Class 150 rating indicates the pressure class for standard water, oil or gas service. Buyers needing a different thread standard or a larger diameter should select another fitting.

California Proposition 65 notice

The product contains a chemical known to the State of California to cause cancer and birth defects or other reproductive harm. No thermal, noise or power-draw characteristics apply to this passive mechanical component. Handling should follow normal shop safety practices for metal fittings.

Class 150 pressure rating

The single specification that decides suitability is the Class 150 pressure rating combined with the 3/4 in NPT thread size. Verify that your system design matches this class and thread type before purchase.

How it compares

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

Price $1.56
Cheaper than about 96% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameZoro Select

Questions about this item

How do I install this 3/4 in NPT locknut without cross-threading?

Start the locknut by hand onto the male NPT threads until it seats fully, then tighten with a wrench; the step people get wrong is applying pipe wrench force before the threads are fully engaged.

What maintenance or replacement will this galvanized malleable iron locknut need later?

Inspect the galvanized coating annually for white rust or pitting; replace the locknut if the zinc layer is breached or if the iron shows red corrosion.

What limit shows up first on this Class 150 locknut under sustained pressure?

The Class 150 pressure rating is the governing limit; sustained internal pressure above that rating risks permanent deformation of the malleable iron body.

More in Hose Fittings, Adapters & Clamps

Similar items