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Double-acting ND

Short-stroke cylinder ND/NE

Double-acting short-stroke cylinders of the ND series deliver active force in both extend and retract directions, making them suitable wherever loads occur in both stroke directions. The range covers bore diameters from 12 to 100 mm with strokes from 5 mm up to 100 mm (at 100 mm bore), enabling fine-grained stroke selection for spatially constrained designs. Repair kits (REP articles) are available per bore diameter for straightforward field maintenance.

⚙ Double-acting - active force in extend and retract; no return spring required
↕ Bores 12-100 mm, strokes 5-100 mm - fine increments (e.g. ND 12/5, ND 100/100)
✓ Flat profile - smaller installation depth than equivalent ISO round cylinders
✦ Repair kits REP - seal sets per bore diameter for field maintenance without full replacement
⚡ NDM variant - same series with anti-rotation piston rod for tooling carrier applications

Bore (mm)Available strokes (mm)Example article
125, 10, 15, 20, 25, 30, 40ND 12/10
165, 10, 15, 20, 25, 30, 40, 50ND 16/20
205, 10, 15, 20, 25, 30, 40, 50, 60, 70Airtec NDM 20/70
325, 10, 15, 20, 25, 30, 40, 50, 60, 80ND 32/25
635, 10, 15, 20, 25, 30, 40, 50, 60, 80ND 63/30
10010, 15, 20, 25, 30, 40, 50, 60, 80, 100ND 100/100

Typical applications: Double-acting ND cylinders are suited for clamping fixtures requiring holding force in both end positions, for punching units and press tooling with short working strokes, for lift-and-lower tables in assembly systems, and for diverters and gates in conveying equipment where back-pressure can occur during retraction.

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What are double-acting ND short-stroke pneumatic cylinders and where are they primarily used in industrial applications?
Double-acting ND short-stroke pneumatic cylinders are pneumatic actuators that receive pressurised air on both sides of the piston, enabling powered extension and retraction movements with precise positioning control. These cylinders feature compact stroke lengths ranging from 10mm to 100mm with consistent 100mm bore diameter, making them ideal for automated assembly lines, packaging equipment, and material handling systems. Manufacturing industries including automotive, electronics assembly, and pharmaceutical production rely on these cylinders for applications requiring rapid cycling, accurate positioning, and bidirectional force generation in confined installation spaces.
What are the key technical selection criteria for choosing between different ND cylinder stroke lengths and variants?
Selection of ND short-stroke cylinders depends primarily on required stroke length, available installation space, and force requirements at operating pressure. The ND series offers stroke options from 10mm (NDM 100/10) to 100mm (NDM 100/100) with standard 100mm bore diameter, providing consistent force output across all variants. Critical selection factors include maximum operating pressure typically 8-10 bar, required cycle frequency, mounting orientation constraints, and whether magnetic piston position sensing is required. Applications demanding frequent reversing movements benefit from shorter stroke variants like 15mm or 20mm models, while positioning tasks requiring extended reach utilise 80mm or 100mm stroke configurations.
Which international standards and certifications apply to double-acting ND pneumatic cylinders for industrial use?
Double-acting ND pneumatic cylinders comply with ISO 15552 standard for pneumatic fluid power cylinders, ensuring dimensional interchangeability and performance consistency across manufacturers. These cylinders meet ISO 8573 compressed air quality requirements and are designed according to DIN EN 61508 functional safety standards for industrial automation applications. European market compliance includes CE marking under Machinery Directive 2006/42/EC, while pressure vessel components conform to EN ISO 4414 pneumatic system safety standards. Manufacturing facilities in ATEX-classified zones require explosion-proof variants meeting EN 60079 directives for hazardous area equipment certification.
What are the main differences between ND and NDM variants in the double-acting short-stroke cylinder range?
The primary distinction between ND and NDM cylinder variants lies in magnetic piston position sensing capability, where NDM models incorporate integrated magnetic bands for non-contact position detection. Both variants share identical 100mm bore diameter and stroke length options from 10mm to 100mm, maintaining consistent force output and mounting dimensions per ISO 15552 standards. NDM cylinders enable precise position feedback through magnetic sensors mounted externally on the cylinder barrel, essential for closed-loop positioning control in automated systems. Standard ND models provide cost-effective solutions for applications requiring only end-position detection through mechanical limit switches or basic pneumatic sequencing without continuous position monitoring.
What are the installation requirements and system compatibility considerations for ND double-acting cylinders?
ND double-acting cylinders require compressed air supply at 6-10 bar working pressure with ISO 8573 Class 7:4:4 air quality including moisture removal and 40-micron filtration. Standard G1/8" or G1/4" threaded ports accommodate pneumatic fittings according to ISO 228-1 specifications, with separate supply connections for extend and retract chambers enabling independent pressure control. Installation demands rigid mounting surfaces capable of withstanding full cylinder force output, typically 500-800N at 6 bar operating pressure for 100mm bore diameter. System integration requires appropriate flow control valves, pressure regulators, and directional control valves sized for cylinder displacement volume and desired cycle times.
What safety ratings, IP protection class, and operating temperature ranges apply to ND pneumatic cylinders?
ND double-acting pneumatic cylinders typically feature IP54 ingress protection rating, providing dust-limited entry protection and splash water resistance suitable for standard industrial environments. Operating temperature range spans -10°C to +80°C for standard sealing materials, with high-temperature variants available for applications reaching +150°C using fluorocarbon seals. Maximum working pressure rating reaches 10 bar with 1.5x safety factor according to ISO 4414 pneumatic safety standards, while burst pressure testing exceeds 4x working pressure. Cylinder construction includes integrated safety features such as captured piston rods preventing complete ejection under pressure, and cushioning options to reduce impact forces during high-speed operation cycles.
What maintenance intervals and service life expectations apply to double-acting ND short-stroke cylinders?
ND double-acting pneumatic cylinders require preventive maintenance every 1-2 million operating cycles or annually, whichever occurs first, including seal inspection and lubrication system verification. Service life typically ranges 5-10 million cycles under normal operating conditions with proper compressed air quality per ISO 8573 standards and appropriate pressure regulation. Maintenance procedures include monthly visual inspection of rod seals for leakage, quarterly pressure testing at maximum working pressure, and annual complete disassembly for seal replacement and internal component examination. Critical wear indicators include external air leakage exceeding 1 bar pressure drop over 24 hours, reduced force output, or irregular motion characteristics indicating internal seal degradation requiring immediate service intervention.