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Pneumatic Accessories

Pneumatic accessories are the connection hardware that links compressed air sources, FRL units, valves, and cylinders into a functioning circuit, spanning pneumatic fittings, tubing, and cylinder mounting components. They are among the most frequently replaced items in any facility with pneumatic equipment, sourced whenever a connection is damaged during servicing, tubing requires rerouting, or a cylinder mounting component needs replacement. PLC Direct stocks pneumatic accessories from Festo for replacement and maintenance in existing installed pneumatic systems.

Where Are Pneumatic Accessories Used in Industrial Environments?

Pneumatic fittings and accessories are sourced whenever a compressed air circuit needs to be repaired or modified, making them the highest-turnover items in any facility operating pneumatic equipment. Unlike cylinders or FRL units that serve specific functional roles, fittings and tubing are the connective elements of the circuit and may require replacement whenever a connection is accessed for maintenance or equipment is repositioned.

Facilities and operations that depend on pneumatic accessories include:

Machine maintenance departments where pneumatic fittings and tubing are stocked as standard consumables for compressed air circuit repair.

Production facilities rerouting pneumatic circuits during equipment layout changes or machine relocations.

Food processing and beverage plants requiring tubing and fittings compatible with food zone hygiene requirements.

Automotive and fabrication facilities where cylinder mounting brackets and position sensing accessories require replacement after extended service.

Pneumatic tool stations and assembly workstations where push-in fittings at compressed air supply points are routinely replaced following hose servicing.

When sourcing replacement pneumatic accessories, confirming the tubing outside diameter and port thread type ensures the replacement fits the installed circuit without modification.

Which Brands of Pneumatic Accessories Does PLC Direct Stock?

PLC Direct stocks pneumatic accessories from Festo for replacement and maintenance in existing installed systems.

Festo QS series: Push-in pneumatic fittings in straight, elbow, and multi-way configurations for compressed air tubing connections in installed pneumatic circuits.

Festo NPQH series: Compact push-in fittings for smaller tubing applications and space-constrained pneumatic installations.

Festo PUN and PLN series: Polyurethane and nylon pneumatic tubing for routed connections between components in installed pneumatic systems.

Festo cylinder mounting accessories: Mounting brackets, position sensing switches, and cushioning components for installed Festo cylinder installations.

All pneumatic accessories in this collection are available as Sealed Surplus, Never Used Surplus, or Used/Refurbished, subject to inventory.

What Should You Know Before Ordering Pneumatic Accessories?

Hardware condition options: Pneumatic accessories are supplied as Sealed Surplus, Never Used Surplus, or Used/Refurbished. For push-in fittings and tubing, Sealed Surplus units are preferred to ensure connection integrity, since in-service fitting bodies and collets can wear, reducing the reliability of the push-in connection over time.

Compatibility and part identification: Pneumatic push-in fittings are specified by the tubing outside diameter they accept and the thread type and size of their port connection, both of which must match the installed circuit. Cylinder mounting accessories are series-specific; confirm the installed cylinder's product family and configuration from its part number before ordering mounting brackets or position sensing components.

Warranty: All pneumatic accessories hardware purchased from PLC Direct carries a standard 1-year PLC Direct warranty, not an OEM warranty, covering defects and functionality, applicable to all condition grades. This warranty is issued by PLC Direct as an independent supplier. PLC Direct supplies pneumatic accessories hardware for replacement and maintenance purposes and does not provide system design, programming, or integration services.

Frequently Asked Questions

A push-in fitting uses an internal collet with angled teeth that grip the tubing when it is pushed in and hold it under pressure, forming a secure connection without tools. To release the tubing, the collet ring is pressed toward the fitting body while pulling the tubing, which retracts the teeth and allows the tube to slide out.

Polyurethane tubing is more flexible and kink-resistant, making it better suited for applications where tubing must flex repeatedly or be routed around tight bends. Nylon tubing is harder and more rigid, providing better resistance to elevated temperatures and higher pressures, and is preferred in static routing applications where the tubing does not need to flex in service.

Applying a soapy water solution to the fitting while the circuit is pressurized will produce bubbles at the leak point, making it visible without specialized equipment. Leaks at push-in fittings are commonly caused by a damaged tubing end, a worn collet gripper, or insufficient tube insertion depth; depressurize the circuit before attempting to remove or reseat the fitting.

G thread is a parallel thread standard used throughout Europe and in Festo products, where sealing is achieved by a bonded seal or O-ring at the face rather than the thread itself. NPT is a tapered thread standard common in North American equipment, where sealing relies on the thread taper compressing into the port; G and NPT threads are not directly interchangeable and require an adapter to connect between the two standards.

Tubing should be replaced when the cut end shows compression marks from prior fittings, surface cracking, discoloration from heat or chemical exposure, or any deformation that would prevent a secure seal in a push-in collet. Reusing tubing with a compromised end by cutting back to undamaged material is acceptable if sufficient tubing length remains to reach the fitting at full insertion depth.