KQ2N stem-style straight push-in fittings are one-touch pneumatic connectors engineered as drop-in replacements for SMC KQ2N series. Featuring male thread, equal-diameter stem and reducing stem variants, these fittings support quick tool-free tube assembly for PU and PA tubing. Suitable for both compressed air and vacuum pipelines in automation equipment, robotic handling and pneumatic fixture applications. PBT body paired with nickel-plated brass threads delivers stable sealing within 0℃~60℃ working temperature.
KQ2N is a stem-style straight pneumatic fitting. One end is male thread or stem, the other end accepts PU/PA air tubing. It is a direct replacement for SMC KQ2N series one-touch fittings. Widely used in pneumatic circuits and vacuum pipelines. Tool-free installation, simply press the release collar to insert or remove tubing quickly.
Four structural types available:
Male thread stem type (M thread: M5)
Male thread stem type (Imperial taper R thread: 1/8,1/4,3/8)
•Equal diameter stem straight (-99 suffix): both ends with same OD stem
•Reducing stem straight fitting: two stems with different outer diameters for size transition
2. Model Code Explanation
Example: KQ2N04-M5
• KQ2N: Series code, stem type straight fitting
•04: Tube outer diameter Φ4mm on push-in side
•M5 / 01S / 02S: Male thread specification
•-99: Equal diameter stem straight fitting
•04-06: Reducing stem fitting, ①Φ4 → ②Φ6
Code Segment
Description
KQ2N
Series code: Stem type straight push-in fitting
04/06/08/10/12/16
Tube outer diameter ΦD (mm)
M5
Metric male thread M5×0.8
01S/02S/03S
Imperial R taper thread: R1/8, R1/4, R3/8
-99
Equal diameter stem straight fitting, both ends same OD
Dual digits e.g.04-06
Reducing stem fitting: ① inlet OD, ② outlet OD
3. Key Technical Specifications
Item
Parameter
Applicable Tubing
PU polyurethane tube, PA nylon tube
Operating Pressure
0~1.0MPa, compatible with vacuum negative pressure circuit
Plastic body with nickel-plated brass thread for corrosion resistance and reliable thread sealing
•Compatible with PU polyurethane air tube and PA nylon tube
Rated working pressure 0~1.0MPa, suitable for vacuum negative pressure circuits
•Operating temperature range: 0℃ ~ +60℃
•Simple assembly: keep tube end smooth and insert directly; press front release collar to pull out tubing for disassembly
6. Application Scenarios
Automation machinery, robotic arms, vacuum adsorption systems, pneumatic fixtures, air compressor piping. Direct replacement for imported SMC KQ2N series fittings.
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