Festo Official Type: QSML-1/8-4 Festo Part No.: 153334

Product Overview

The Festo Instant Male Elbow QSML-4-1/8 is a compact 90-degree pneumatic push-in fitting designed to connect 4 mm outside-diameter pneumatic tubing to an R1/8 male threaded port.

The fitting combines a space-saving L-shaped configuration with Festo's push-pull connection principle, allowing pneumatic tubing to be inserted and released quickly without requiring a conventional compression-style tube connection. The right-angle design is particularly useful where tubing needs to change direction immediately at the pneumatic component, helping maintain a clean and compact installation.

The QSML-1/8-4 belongs to Festo's Mini fitting range and uses a nickel-plated brass threaded section, PBT housing, blue POM release ring, NBR tube seal and a high-alloy stainless-steel tube retaining component.

Key Features

• Genuine Festo QSML series pneumatic fitting
• Festo Part No. 153334
• Official type: QSML-1/8-4
• 90-degree L-shaped configuration
• 4 mm outside-diameter tube connection
• R1/8 male thread
• Push-in / push-pull tube connection
• Blue release ring for tube release
• Compact Mini-series construction
• External hexagon, SW10, for installation
• Nickel-plated brass threaded section
• PBT housing
• NBR tube seal
• High-alloy stainless-steel tube retaining component
• Suitable for compressed-air applications
• Lubricated operation is possible according to Festo's data
• RoHS compliant
• VDMA24364-B1/B2-L PWIS conformity

Technical Specifications

These specifications are based on Festo's current data sheet for Part No. 153334.

90-Degree Space-Saving Pneumatic Connection

The principal advantage of the QSML-1/8-4 is its 90-degree L-shaped configuration. Instead of routing the pneumatic tube straight out from the threaded port and then creating a separate bend, the fitting redirects the tube immediately.

This makes the fitting useful for installations where pneumatic components are mounted close together or where available routing space is limited.

The compact Mini-series format is particularly suitable for smaller pneumatic assemblies and automation equipment.

Quick Push-In Tube Connection

The QSML-1/8-4 uses a push-pull connection principle. Compatible 4 mm outside-diameter pneumatic tubing can be inserted directly into the fitting.

The blue release ring provides a convenient mechanism for releasing the tube during maintenance or system reconfiguration. This can reduce installation time compared with conventional tube connection methods.

R1/8 Male Thread Connection

One side of the fitting incorporates an R1/8 external male thread, allowing the QSML-1/8-4 to be installed directly into compatible pneumatic components.

The threaded section is manufactured from nickel-plated brass, while Festo specifies a coated sealing arrangement on the screwed plug. The external hexagon is SW10, providing the installation interface.

Typical Applications

The Festo QSML-1/8-4 can be used in a wide range of pneumatic and automation applications, including:

• Industrial automation systems
• Pneumatic valve connections
• Pneumatic actuators and cylinders
• Compact pneumatic manifolds
• Machine-building equipment
• Robotics and handling systems
• Pneumatic control panels
• Instrumentation systems
• Factory automation
• Compressed-air distribution circuits
• Space-constrained pneumatic assemblies

Installation Guidelines

1. Use compatible 4 mm outside-diameter pneumatic tubing.
2. Cut the tubing cleanly and squarely using an appropriate tube cutter.
3. Ensure the tube end is free from burrs, deformation and contamination.
4. Insert the tube fully into the push-in port.
5. Perform a gentle pull test to confirm that the tube is properly retained.
6. Install the R1/8 male thread into the compatible pneumatic component.
7. Use the SW10 external hexagon for controlled installation.
8. Festo specifies a nominal tightening torque of 7 Nm ±20% for this fitting.
9. Do not exceed the specified operating pressure and temperature limits.
10. Inspect the connection for leakage before placing the pneumatic system into service.