Smc Pneumatics KCH04-00 Push-to-connect Union Fitting

Product Description

The SMC PNEUMATICS KCH04-00 is a straight union push-to-connect tube fitting designed for quick, tool-free connections in pneumatic and fluid distribution lines. Constructed from brass and polybutylene, it accepts tubing with a 4 mm outside diameter and holds a maximum working pressure of 145 psi. The straight union configuration allows two tube ends to be joined inline without additional fittings or thread work. This fitting is well suited for compressed air lines, light fluid circuits, and instrumentation tubing in industrial, commercial, and light mechanical environments. Installation is typically performed by HVAC technicians, pneumatic system technicians, or millwrights maintaining equipment-level pneumatic circuits.

The KCH04-00 is used in pneumatic control systems, fluid transfer assemblies, and instrumentation lines where a compact, reliable inline union is needed. Its push-to-connect design makes it a practical choice for panel builds, OEM equipment assemblies, and service work where downtime must be minimized. The fitting is appropriate for applications requiring RoHS-compliant components. No special tooling is required to seat the tubing, and disconnection can typically be performed by depressing the release collar and withdrawing the tube.

Key Features

• Push-to-connect design allows fast, tool-free tube insertion and release
• Brass and polybutylene construction provides corrosion resistance in pneumatic service
• Rated to 145 psi maximum working pressure for reliable sealing in compressed air systems
• Accepts 4 mm outside diameter tubing for a secure, leak-resistant fit
• RoHS compliant for use in applications with material restriction requirements
• Compact straight union profile at 42.10 mm overall length suits tight installation spaces

Compatibility

Designed as an OEM-style inline union for pneumatic and light fluid tubing systems using 4 mm outside diameter tube, rated up to 145 psi working pressure.

Installation Notes

Installation is typically performed by a pneumatic technician or qualified mechanic. Before servicing any pneumatic line, depressurize the system fully and verify pressure has bled to zero before disconnecting existing fittings. Ensure tubing ends are cut cleanly and squarely without burrs before inserting into the push-to-connect collet. Follow applicable equipment manufacturer guidelines and any relevant local codes governing pneumatic fluid power systems.