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Brass gas regulator with twin gauges and nickel-plated bonnet

Miller-Smith Equipment

Miller-Smith Equipment 40-175-540 Gas Regulator, Single Stage, CGA-540, 175 psi

SKU CH-2KH8-HNVMJ

Single-stage oxygen regulator with CGA-540 inlet, 175 psi delivery range and 2 in gauges

  • Product typeWelding Supplies
  • Single-stage design gives direct cylinder-to-torch control
  • CGA-540 inlet fits standard oxygen cylinders
  • 175 psi delivery range covers general-purpose welding
  • Brass body with stainless-steel diaphragm resists corrosion
  • UL Listed and external relief valve add safety

Miller-Smith Oxygen Regulator CGA-540

This single-stage regulator controls oxygen flow from high-pressure cylinders for general welding tasks. It connects directly to a CGA-540 valve outlet and delivers adjustable pressure up to 175 psi. The brass body and stainless-steel diaphragm resist corrosion in workshop environments.

Brass Body Stainless Diaphragm Construction

A 3.25-inch brass body houses the internal mechanism while a nickel-plated bonnet protects the adjustment assembly. The 2-inch dual gauges display supply pressure up to 4,000 psi and working delivery pressure simultaneously. An external relief valve vents excess pressure automatically for operator safety.

Replaces Worn Single-Stage Units

Upgrading from a damaged or leaking regulator restores precise pressure control for consistent weld quality. The UL-listed design meets standard safety requirements for oxygen service. Buyers needing multi-stage pressure stability or non-oxygen gas compatibility should select a different model.

How it compares

Measured against everything we stock in Welding Equipment & Positioners, at today’s prices. Recalculated every night.

Price $257.99
Pricier than about 84% of the 1,978 comparable items (median $50.99).

Specifications

Product
Brand nameMILLER ELECTRIC
Product typeWelding Supplies

Questions about this item

What delivery pressure does the CGA-540 single-stage regulator cap at in practice?

The single-stage design delivers up to 175 psi outlet pressure from a 3,500 psi maximum inlet, with the supply gauge reading to 4,000 psi.

What outlet fitting and body diameter must the bench or bracket accommodate?

The regulator has a 9/16 in.-18 RH B outlet and a 3.25 in. brass body diameter for mounting clearance.

How is the CGA-540 inlet connected to the cylinder, and what step is often missed?

Thread the CGA-540 nut onto the oxygen cylinder valve, tighten with a wrench, then open the cylinder valve slowly to seat the stainless-steel diaphragm before adjusting the delivery pressure.

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