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
Circular zinc-plated malleable iron flange with four bolt holes

Value Brand

Value Brand Flange 3 1/2 in Thrd Malleable Iron

SKU CH-Q9ZB-PQ2E2

A 3 1/2 inch threaded malleable iron flange rated for 300 psi maximum operating pressure

  • Threaded connection simplifies pipe assembly
  • Malleable iron construction withstands mechanical stress
  • Zinc-plated finish resists corrosion in damp environments
  • Class 150 rating supports 300 psi operating pressure
  • Four bolt holes enable secure flange-to-flange joining

Plumbing flange for threaded pipe

The Value Brand flange connects a 3 1/2 in flanged face to a female NPT thread on malleable iron piping. It suits installers assembling low-pressure water, air or gas lines where a Class 150 rating is specified. The zinc-plated A197 body resists corrosion in typical indoor or sheltered outdoor runs. Buyers who need a welded neck or a higher pressure class cannot use this fitting.

Thermal and pressure limits in service

Malleable iron handles the 300 psi maximum operating pressure at ambient temperatures without measurable expansion. The material does not generate heat, so no cooling or noise considerations apply. The zinc coating remains stable within the Class 150 temperature envelope. Systems that exceed 300 psi or cycle through extreme temperature swings are outside the design envelope.

Installation requirements and space impact

Four bolt holes on a 150 pattern align with standard companion flanges and gaskets. The 9/16 in overall length keeps the joint compact, freeing clearance for adjacent valves or supports. Installers must supply bolts, nuts and a compatible gasket; none are included. The fitting is restricted from sale in California due to Proposition 65 chemical content.

Highlights

  • Threaded connection simplifies pipe assembly
  • Malleable iron construction withstands mechanical stress
  • Zinc-plated finish resists corrosion in damp environments
  • Class 150 rating supports 300 psi operating pressure
  • Four bolt holes enable secure flange-to-flange joining

Specifications

BrandZORO SELECT

Questions about this item

How do I install the 3 1/2 in threaded malleable iron flange and what step is often missed?

Thread the flange onto the pipe using sealant on the FNPT threads, then bolt the flanged face to the mating flange using all four bolt holes; the step often missed is tightening the bolts in a cross pattern to seat the gasket evenly.

What maintenance or replacement will the ZORO SELECT 5P967 flange need over time?

Inspect the zinc-plated surface and bolt-hole threads periodically for corrosion or galling; replace the flange if the malleable iron body shows cracks or if the Class 150 pressure rating can no longer be maintained.

What is the first limit reached under sustained use of this Class 150 flange?

The 300 psi maximum operating pressure is the primary limit; sustained pressure at or above this value will stress the A197 malleable iron body and bolted joint before any other factor.

Also in this aisle

People compared these

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