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Brass push-fit adapter with 4mm tube end and M6x1.0 male thread

SMC

SMC KQ2H04-M6A Push-Fit Adapter Trap 4mm M6x1.0 Brass 145psi 140F

SKU CH-WQTH-SSPXQ MPN KQ2H04-M6A

Connects 4 mm tubing to an M6×1.0 male thread, rated to 145 psi and 140 °F

  • TypeDrain Components
  • ColorBrass
  • Push-to-connect 4 mm tube for quick assembly
  • M6×1.0 male thread fits metric ports
  • Brass body resists corrosion in air and non-potable water
  • Rated 145 psi for high-pressure pneumatic lines
  • Withstands 140 °F operating temperature

Push-Fit Adapter for Air and Water Lines

The SMC KQ2H04-M6A is a brass push-fit adapter fitting designed for pneumatic and non-potable water applications. It connects a 4 mm outer-diameter tube on the push-to-connect side to an M6x1.0 male metric thread on the other side. The fitting handles a maximum operating pressure of 145 psi and a maximum operating temperature of 140 degrees F. It is supplied new and ready for installation in compatible fluid systems.

Suited for Compact Metric Thread Ports

This adapter suits engineers and technicians who need a quick, tool-free connection to a small M6x1.0 port in air or non-potable water circuits. The push-to-connect end accepts 4 mm tubing without additional clamps or soldering. It is not intended for potable water systems, high-pressure hydraulic lines exceeding 145 psi, or applications requiring a larger tube diameter or a different thread standard such as BSP or NPT.

Consistent Seal Under Continuous Pressure

Under sustained load the brass body and pre-applied thread sealant maintain a reliable seal at the rated 145 psi limit. The push-to-connect mechanism grips the 4 mm tube securely during prolonged pressurisation and thermal cycling up to 140 degrees F. Performance remains stable without the pressure drop or leakage spikes sometimes seen in short-term burst tests.

Highlights

  • Push-to-connect 4 mm tube for quick assembly
  • M6×1.0 male thread fits metric ports
  • Brass body resists corrosion in air and non-potable water
  • Rated 145 psi for high-pressure pneumatic lines
  • Withstands 140 °F operating temperature

Specifications

TypeDrain Components
ColorBrass
BrandSmc
ModelKQ2H04-M6A

Questions about this item

What tube outer diameter must my line have to connect to the 4 mm push-to-connect side?

The fitting accepts a 4 mm outer-diameter tube on the push-to-connect side.

Can I thread the M6x1.0 male end into an existing M6x1.0 port on older equipment?

Yes, the male metric thread is M6x1.0 and will engage any matching M6x1.0 female port.

How do I confirm the joint holds at the rated 145 psi after installation?

Pressurise the system to the working pressure and check for leaks; the fitting is rated to 145 psi maximum operating pressure.

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