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Hexagonal stainless steel reducing coupling, silver metal finish

Zoro Select

Zoro Select 7811 Reducing Hex Coupling 304 Stainless Steel Female

SKU CH-K6PX-18WX2

Stainless steel reducing coupling joins 1/2 inch and 3/8 inch NPT threads at up to 4,600 psi

  • Corrosion-resistant 304 stainless steel construction ensures long service life
  • Leak-tight joints rated to 4,600 psi support high-pressure systems
  • Reducing 1/2 inch to 3/8 inch NPT threads connect different pipe sizes
  • Hex profile allows standard tool installation for secure assembly
  • Meets ANSI B31.1 and low-lead standards for code compliance

Reducing Hex Coupling 7811

This Zoro Select fitting joins 1/2 inch NPT pipe to 3/8 inch NPT pipe in instrumentation and control systems. Made from 304 stainless steel, it serves installers who need a corrosion-resistant transition between different pipe sizes. The 1 1/8 inch hex allows tightening with standard wrenches. It is supplied without pre-applied thread sealant.

Build integration and space

The 1 1/2 inch overall length keeps the joint compact inside panels or tubing runs. Both ends use NPT threads, so the coupling fits directly into existing threaded ports without adapters. Installers must supply compatible sealant or tape for leak-tight assembly. The reduction frees up space by eliminating a separate bushing and nipple combination.

Pressure rating and service conditions

Rated for 4600 psi maximum operating pressure under specified conditions, the coupling handles air, natural gas, oil, potable water and steam within manufacturer limits. Grade 304 stainless steel resists corrosion in these media. The fitting meets ANSI B31.1 and low-lead compliance standards. No thread sealant is included, so joint integrity depends on correct field preparation.

How it compares

Measured against everything we stock in Drain Cleaners & Plumbing Tools, at today’s prices. Recalculated every night.

Price $28.99
Cheaper than about 68% of the 1,087 comparable items (median $57.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

What is the maximum pressure this 304 stainless steel coupling can handle in continuous operation?

The coupling is rated for a maximum operating pressure of 4,600 psi under specified conditions.

How much heat does the fitting generate when steam flows through it all day?

The fitting itself generates no heat; it simply conducts the temperature of the fluid passing through it.

Which thread standard must my existing piping use to connect to this NPT fitting?

Your piping must use NPT (National Pipe Thread) threads to match the 1/2 inch and 3/8 inch connections on this coupling.

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