KQB2L08-02S: SMC KQB2 Series Φ8mm L-Shaped Metal Push-in Fitting (R1/4 Male Thread, with Sealant)
2026-02-06
I. Model Designation and Basic Parameters
Model Structure: KQB2L08-02S
| Code | Meaning | Detailed Description |
|---|---|---|
| KQB2 | Series Code | SMC KQB2 Series Metal Push-in Fittings |
| L | Fitting Shape | L-shaped Elbow |
| 08 | Applicable Tube OD | Φ8 mm |
| 02 | Connection Thread | R1/4 Male Thread |
| S | Sealing Method | With Sealant |
Main Technical Specifications:
| Characteristic | Specification | Practical Significance |
|---|---|---|
| Applicable Tube OD | Φ8 mm | Can connect to Φ8 mm tube |
| Connection Thread | R1/4 Male Thread | Thread interface specification |
| Sealing Method | With Sealant | Sealant applied to threads for sealing |
| Operating Pressure Range | -0.1～1.0 MPa | Working pressure range (includes vacuum) |
| Maximum Operating Pressure | 1.0 MPa | Maximum allowable working pressure |
| Proof Pressure | 3.0 MPa | Pressure test rating |
| Fluid Temperature | -5～150 °C | Medium temperature range |
| Ambient Temperature | -5～150 °C | Operating environment temperature range |
| Operating Fluid | Air, Water, Nitrogen | Suitable media |
| Body Material | SUS304 Stainless Steel | Main body material |
| Insert Material | C3604 Brass (Non-Electrolytic Ni Plated) | Insert material |
| Collet Material | SUS304 Stainless Steel | Collet material |
| Guide/Sleeve Material | SUS304 Stainless Steel | Guide/sleeve material |
| Release Sleeve Material | SUS304 Stainless Steel | Release sleeve material |
| Seal Material | Special FKM (Fluorine Coated) | Seal material |
| O-Ring Material | Special FKM (Fluorine Coated) | O-ring material |
| Compatible Tubing | FEP, PFA, Nylon, Polyurethane, Polyolefin | Suitable tubing materials |
II. Structural Features and Operating Principle
Structural Components:
- L-Shaped Elbow: 90° elbow design saves installation space.
- Push-in Fitting Structure: Allows for quick connection and disconnection.
- Sealing Structure: Sealant on threads ensures reliable sealing.
- Metal Collet: SUS304 stainless steel collet provides strong gripping force.
- Guide/Release Sleeve: SUS304 stainless steel for guiding and release functions.
- Seals: Made from special FKM material for high temperature and corrosion resistance.
Operating Principle:
The KQB2L08-02S features a push-in connection structure. When a tube is inserted, the collet automatically locks it in place for a quick, secure connection. Pressing the release sleeve disengages the collet, allowing the tube to be quickly removed. The L-shaped elbow design changes the piping direction, saving space. Sealant applied to the threads ensures airtight connections. The special FKM seals offer excellent high-temperature and chemical resistance, making the fitting suitable for various media.
III. Core Advantages
- Quick Connection/Disconnection
- Push-to-connect design: Insert tube for connection, press sleeve for removal.
- No tools required for easy, fast installation and removal.
- Ideal for applications requiring frequent tube changes.
- High Reliability
- Operating pressure range: -0.1 to 1.0 MPa; Proof pressure: 3.0 MPa.
- Special FKM seals offer long life with high temperature and corrosion resistance.
- SUS304 stainless steel body provides excellent corrosion resistance.
- L-Shaped Elbow Design
- 90° elbow structure changes piping direction.
- Saves installation space, facilitating piping in tight spaces.
- Reduces tubing bends, minimizing pressure drop.
- Wide Material Compatibility
- Compatible with various tubing materials: FEP, PFA, Nylon, Polyurethane, Polyolefin.
- Suitable for air, water, nitrogen, and other media.
- Wide fluid temperature range: -5 to 150°C, for broad applicability.
- Sealant-Integrated Design
- Pre-applied sealant on threads ensures reliable sealing.
- Prevents leaks at threaded connections.
- Simplifies installation; no need for additional sealant tape.
IV. Typical Application Scenarios
- Industrial Automation
- Air circuit piping on automated production lines.
- Air circuit connections for robot end-effectors.
- Material handling systems on automated assembly lines.
- Packaging Machinery
- Air circuit connections on packaging equipment.
- Air circuit piping for sealing machines.
- Air circuit connections for labeling equipment.
- Material Handling Equipment
- Air circuit connections for material handling manipulators/robots.
- Air circuits on automated storage/retrieval system conveyors.
- Material transfer system piping on production lines.
- Testing/Inspection Equipment
- Air circuit connections for automated inspection lines.
- Air circuit piping for vision inspection systems.
- Air circuit connections for dimensional measurement equipment.
- Machine Tool Equipment
- Air circuit connections on CNC machines.
- Air circuits for clamping devices on milling/drilling machines.
- Air circuit piping for mechanical processing equipment.
V. Installation and Usage Precautions
Installation Key Points:
- Pre-installation Check: Inspect product for scratches/deformation; verify nameplate matches design.
- Tube Preparation: Cut tube end squarely, ensuring a smooth, burr-free surface.
- Tube Insertion: Insert tube straight into fitting until a “click” is heard, confirming the collet has locked.
- Threaded Connection: No additional sealant tape is needed; tighten the fitting directly.
- Mounting Orientation: Vertical mounting is recommended; ensure connections are accessible.
Usage Notes:
- Operating Conditions: Do not exceed 1.0 MPa operating pressure; ambient temperature -5 to 150°C.
- Medium Requirements: Use clean, dry air or water; avoid oil, water, impurities; confirm material compatibility for corrosive media.
- Tube Inspection: Regularly check tube condition; replace if aged or cracked.
- Safety Precautions: Do not use in explosive atmospheres; do not exceed rated pressure limits.
- Regular Inspection: Periodically check seals and collet function; address leaks promptly.
Maintenance:
- Regular Inspection: Periodically check appearance, seals, collet for damage or looseness.
- Cleaning: Keep connections clean to prevent contamination; perform maintenance with system depressurized.
- Long-Term Storage: If unused for long periods, apply anti-corrosion measures and perform periodic checks.
VI. Selection Recommendations
Suitable applications for KQB2L08-02S:
- Applications requiring connection to Φ8 mm tubing.
- Need for R1/4 male thread interface.
- Need for L-shaped elbow design to save space.
- Requirement for quick connect/disconnect capability.
- Operating pressure range of -0.1 to 1.0 MPa.
- Fluid temperature range of -5 to 150°C.
- Suitable for air, water, nitrogen, and similar media.
Selection Calculation Reference:
- Tube OD Selection: Select based on flow requirements (Φ4, Φ6, Φ8, Φ10, Φ12, Φ16).
- Fitting Shape: Choose Straight (H), L-Elbow (L), T-Type (T) based on installation space.
- Thread Specification: Select appropriate thread (M5, R1/8, R1/4, R3/8, R1/2) based on field piping.
- Sealing Method: Choose with sealant (S) or without based on sealing needs.
- Material Selection: Choose brass, stainless steel, etc., based on operating environment.
VII. Summary
The KQB2L08-02S is an Φ8 mm L-shaped metal push-in fitting with a quick-connect structure. It features rapid installation/removal, high reliability, space-saving L-shape design, wide material compatibility, and integrated sealant. Its R1/4 male thread, -0.1 to 1.0 MPa operating pressure range, and -5 to 150°C temperature range make it an ideal choice for industrial automation, packaging machinery, material handling equipment, testing/inspection systems, and machine tools. Through proper selection, correct installation, and regular maintenance, this push-in fitting can ensure long-term stable operation, providing a reliable air/fluid circuit connection solution for users.
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