Fittings

Click fittings

Festo NPKA click fittings combine the push-in principle with an audible click mechanism that signals correct tube engagement. The range consists of three base types: straight fitting (NPKA-D-G18-Q6-P10), T-connector (NPKA-T-Q6-E-P10) and L-fitting (NPKA-L-G18-Q6-P10). All types are rated for 6 mm tube OD and are supplied in packs of 10.

3 items
1 manufacturer
Net prices plus VAT

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Click Fitting NPKA-D-G18-Q6-P10 - Festo 1243489
€2.89
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Elbow Click Fitting NPKA-L-G18-Q6-P10 - Festo 1655429
€4.43
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Click T-Connector NPKA-T-Q6-E-P10 - Festo 1590710
€5.83

Buying guide

How to choose Click fittings

What matters when choosing: properties, comparison and typical applications.

Technical features

⚡ Click mechanism - audible and tactile feedback confirming correct tube locking

✓ G1/8 thread (NPKA-D, NPKA-L) - parallel BSP thread for straightforward installation

⬡ Threadless T-connector (NPKA-T-Q6-E) - tube-to-tube, three outlets

📦 Pack of 10 (P10) - all three types available in 10-piece packs

NPKA type overview

Type	Form	Thread	Tube OD
NPKA-D-G18-Q6-P10	Straight fitting	G1/8	6 mm
NPKA-T-Q6-E-P10	T-connector	Threadless (E)	6 mm
NPKA-L-G18-Q6-P10	L-fitting (90°)	G1/8	6 mm

Typical applications

Typical applications: Assembly lines with high volumes of tube connections where an audible click confirms a correct joint without visual inspection, handling devices with frequent tube wear, and 6 mm tube OD applications at G1/8 ports.

FAQ

Frequently asked questions about Click fittings

What are Festo push-in fittings and which industrial applications commonly use them?

Festo push-in fittings are pneumatic connectors that enable tool-free assembly and disassembly of compressed air lines through a simple push-in mechanism. These fittings are extensively used in automation technology, machine building, packaging equipment, and assembly lines where frequent connection changes or maintenance access is required. The push-in technology allows technicians to connect plastic or metal tubing without threading or compression tools, significantly reducing installation time in industrial pneumatic systems.

What technical criteria should engineers consider when selecting Festo push-in fittings for pneumatic systems?

Engineers must evaluate tube diameter compatibility, thread size specifications, and connection geometry when selecting Festo push-in fittings. The NPKA series accommodates standard tube diameters from 4mm to 12mm with thread connections ranging from G1/8 to G3/4, operating at pressures up to 16 bar depending on the specific model. Connection types include straight-through, T-junction configurations like the NPKA-T-Q6-E-P10, and L-shaped connectors such as the NPKA-L-G18-Q6-P10, with material compatibility for compressed air, inert gases, and vacuum applications.

Which international standards and certifications apply to Festo pneumatic push-in fittings?

Festo push-in fittings comply with ISO 8573 compressed air quality standards and meet DIN EN 983 requirements for pneumatic fluid power connections. The fittings are manufactured according to ISO 9001 quality management standards and undergo testing per ISO 4414 pneumatic system safety protocols. For hazardous area applications, specific models carry ATEX certification for explosive atmosphere compatibility, while food-grade variants meet FDA 21 CFR 177.2600 regulations for direct food contact in packaging machinery.

What are the differences between T-type, L-type, and straight Festo push-in fitting configurations?

T-type fittings like the NPKA-T-Q6-E-P10 create branch connections in pneumatic lines, allowing air flow distribution from one inlet to two outlets at 90-degree angles. L-type connectors such as the NPKA-L-G18-Q6-P10 provide 90-degree directional changes in confined spaces where straight connections are impractical. Straight push-in fittings like the NPKA-D-G18-Q6-P10 offer inline connections between tubing and threaded ports, maintaining direct flow paths with minimal pressure drop across the connection.

What installation requirements and system compatibility considerations apply to Festo push-in pneumatic fittings?

Festo push-in fittings require clean-cut tubing with chamfered edges to ensure proper sealing and prevent damage to internal O-rings during insertion. The fittings are compatible with polyurethane, polyamide, and PTFE tubing materials, with tube outer diameter tolerances of +0/-0.1mm for secure grip retention. System operating media must be filtered to ISO 8573-1 Class 7 or better to prevent contamination of the push-in mechanism, while ambient temperatures should remain between -10°C and +70°C for optimal seal performance and connection reliability.

What pressure ratings and IP protection classes are specified for Festo push-in pneumatic fittings?

Festo push-in fittings typically operate at working pressures up to 16 bar with burst pressure ratings of 80 bar, depending on tube diameter and connection thread size. The fittings achieve IP65 protection rating when properly assembled, providing dust-tight sealing and protection against water jets from any direction. Operating temperature range spans -10°C to +70°C for standard NBR seals, with optional FKM seals extending the range to +150°C for high-temperature pneumatic applications in industrial ovens or hot air systems.

What maintenance schedule and service life expectations apply to Festo pneumatic push-in fittings?

Festo push-in fittings require visual inspection every 6 months for tube condition, connection tightness, and air leakage at operating pressure using leak detection spray or ultrasonic testing equipment. The internal O-ring seals typically provide 10 million connection cycles or 5-year service life under normal operating conditions at pressures below 10 bar. Preventive replacement is recommended when fittings show signs of tube marking, reduced grip force, or air leakage exceeding 0.1 bar pressure drop over 24 hours in static pressure tests.