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Small copper reducing adapter with sweat and threaded ends

Nibco, Inc.

Nibco, Inc. 604-R 1/2" C x 1/4" MNPT Copper Reducing Adapter

SKU CH-TGHK-FVKW5

Connects 1/2" copper tube to 1/4" MNPT for air, gases and potable water, rated 722 psi at 100°F and 400°F maximum temperature

  • Reduces 1/2" copper to 1/4" MNPT for versatile connections
  • Sweat cup joint creates leak-tight potable-water seals
  • Wrot copper construction resists corrosion in air, gas and water systems
  • Rated 722 psi at 100 °F for high-pressure reliability
  • Withstands 400 °F maximum temperature for demanding thermal applications

Copper Reducing Adapter 1/2" to 1/4

This NIBCO 604-R copper reducing adapter joins a 1/2 inch nominal sweat connection to a 1/4 inch male NPT thread. It is designed for installers working with air, gases or potable water systems. The wrot copper construction provides reliable corrosion resistance for standard plumbing and mechanical applications.

Sweat-to-thread transition limits

The adapter uses a cup fitting on the 1/2 inch side that requires soldering to copper tubing with a 5/8 inch outer diameter. The 1/4 inch MNPT end mates with matching female threads using pipe sealant. Rated service pressure is 722 psi at 100 degrees F and the maximum operating temperature is 400 degrees F. Exceeding either limit risks joint failure or accelerated wear.

Capacity headroom for residential service

The 722 psi pressure rating gives ample margin for typical municipal water supplies and low-pressure air lines. Copper handles the full 400 degree F temperature range without softening, so hot water circulation loops stay within safe limits. The reducing step restricts flow to the 1/4 inch port, so high-volume distribution mains would need a larger branch fitting.

Highlights

  • Reduces 1/2" copper to 1/4" MNPT for versatile connections
  • Sweat cup joint creates leak-tight potable-water seals
  • Wrot copper construction resists corrosion in air, gas and water systems
  • Rated 722 psi at 100 °F for high-pressure reliability
  • Withstands 400 °F maximum temperature for demanding thermal applications

Specifications

BrandNIBCO

Questions about this item

Should I pick the 1/2" copper sweat side or the 1/4" MNPT threaded side for my connection?

This single adapter joins a 1/2" nominal copper tube (5/8" OD) on the sweat end to a 1/4" male pipe thread (3/8" OD) on the threaded end; choose it when you need that exact transition.

What does the 722 psi rating mean when the fitting is installed in a working system?

The joint is rated for 722 psi at 100 °F, so it will hold typical residential and light-commercial water or air pressures at normal ambient temperatures.

How does the sweat-to-MNPT interface limit what I can connect?

The sweat end requires soldering to copper tubing, while the MNPT end threads into female NPT ports; the two connection types fix the materials and tools you must use.

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