Overview – Festo DSNU-S-8-20-P-A-MQ Round Cylinder
The Festo DSNU-S-8-20-P-A-MQ is a miniature double-acting round cylinder belonging to Festo's DSNU-S series — a stainless steel variant of the widely trusted DSNU family, designed specifically for applications where standard aluminium cylinders fall short. With an 8mm bore, 20mm stroke, and M5 pneumatic connections, this cylinder packs reliable linear actuation into an extremely compact envelope. It meets Cleanroom Class 5 per ISO 14644-1 and carries LABS/PWIS conformity, making it a genuine fit for food and beverage, pharmaceutical, and semiconductor-adjacent automation where outgassing and particulate emission are concerns.
Unlike standard DSNU cylinders, the DSNU-S variant uses a high-alloy stainless steel cylinder barrel and piston rod in combination with anodised wrought aluminium covers — delivering corrosion resistance class CRC 2 and a surface finish that holds up in humid, chemical, or wash-down environments. If your application runs a compact pick-and-place, valve actuation, or indexing mechanism in a controlled or aggressive environment, this cylinder is worth specifying.
Key Features
- Stainless steel cylinder barrel and piston rod — resists corrosion in wash-down, chemical-exposure, and high-humidity environments without surface coating degradation
- Cleanroom Class 5 suitability (ISO 14644-1) — validated for use in semiconductor, pharmaceutical, and precision assembly environments where particulate limits are strict
- LABS/PWIS conformity (VDMA 24364-B2-L) — safe for use in paint shop and coating environments; no surface-active substances that interfere with paint adhesion
- Double-acting operation — provides positive force on both advance and return strokes: 30.2 N advance, 22.6 N return at 6 bar, giving predictable and repeatable motion in both directions
- Elastic cushioning rings at both ends — absorbs end-of-stroke impact energy (0.03 J rated) without the need for external shock absorbers in typical light-load applications
- M5 pneumatic connection — compact port size consistent with miniature pneumatic systems; pairs directly with standard M5 push-in fittings and miniature solenoid valves
- Any mounting position — no orientation restriction; can be mounted vertically, horizontally, or inverted without affecting performance or seal integrity
- Position detection ready — barrel designed for proximity switch fitment via accessories; T-slot or band-clamp switch mounting available separately
- TPE-U (polyurethane) seals — high-abrasion-resistant seal material suited to demanding duty cycles and compatible with lubricated or dry compressed air operation
- RoHS compliant — meets current EU and UK RoHS directives; safe for use in electronics-adjacent and export-bound machinery
Technical Specifications
| Parameter |
Value |
| Festo Part Number |
5205899 |
| Model Number |
DSNU-S-8-20-P-A-MQ |
| Cylinder Type |
Round cylinder, double-acting |
| Piston Diameter (Bore) |
8 mm |
| Stroke |
20 mm |
| Piston Rod Thread |
M4 |
| Pneumatic Connection |
M5 |
| Operating Pressure |
1.5 bar … 10 bar (0.15 MPa … 1 MPa) |
| Mode of Operation |
Double-acting |
| Cushioning |
Elastic cushioning rings/plates at both ends |
| Impact Energy at End Positions |
0.03 J |
| Theoretical Advance Force at 6 bar |
30.2 N |
| Theoretical Return Force at 6 bar |
22.6 N |
| Moving Mass (0 mm stroke) |
6.3 g |
| Additional Moving Mass per 10 mm Stroke |
1 g |
| Basic Weight (0 mm stroke) |
20 g |
| Additional Weight per 10 mm Stroke |
2.4 g |
| Mounting Position |
Any |
| Type of Mounting |
With accessories (sold separately) |
| Position Detection |
Via proximity switch (accessories required) |
| Operating Medium |
Compressed air to ISO 8573-1:2010 [7:4:4] |
| Lubricated Operation |
Possible (if lubricated, must remain lubricated) |
| Ambient Temperature |
-20 °C … 80 °C |
| Material – Cylinder Barrel |
High-alloy stainless steel |
| Material – Piston Rod |
High-alloy stainless steel |
| Material – Cover |
Anodised wrought aluminium alloy |
| Material – Seals |
TPE-U (polyurethane) |
| Corrosion Resistance Class (CRC) |
2 – Moderate corrosion stress |
| LABS (PWIS) Conformity |
VDMA 24364-B2-L |
| Cleanroom Suitability |
Class 5 per ISO 14644-1 (measured per ISO 14644-14) |
| RoHS Compliant |
Yes |
Common Applications
- Food and beverage packaging lines — compact stroke suits label applicators, small diverter gates, and portion-control mechanisms where wash-down-safe materials are mandatory
- Pharmaceutical blister and strip packaging machinery — cleanroom Class 5 rating and LABS conformity support use in product-contact-adjacent actuation zones
- Textile machinery and yarn-handling equipment — Coimbatore's weaving and spinning sector uses miniature cylinders for thread tensioner actuation and shuttle indexing in tight spaces
- Precision assembly and electronics manufacturing jigs — low moving mass and repeatable stroke make this cylinder ideal for part insertion, clamping, and release cycles in light automation
- CNC machine tool pneumatic circuits — M5 connection integrates cleanly with manifold-mounted miniature solenoid valves for tool-changer or door-latch actuation
- Laboratory and LifeTech automation — stainless construction and cleanroom rating suit pipetting stations, analytical instrument actuators, and medical device assembly rigs
Why Buy from Murali Pneumatics?
- Authorized Festo Channel Partner since 1991 — over three decades of genuine Festo supply in Coimbatore and across Tamil Nadu; every unit is sourced directly from Festo's authorized supply chain
- 100% genuine products with full Festo warranty — no grey-market or counterfeit risk; all products carry valid Festo documentation and batch traceability
- Ready stock of popular DSNU-S variants — common bore and stroke combinations held at our Mill Road store; most orders dispatched same day or next working day
- Expert technical support — our team can help you select the right mounting accessory, proximity switch, fitting, and flow control for your complete cylinder assembly; call +91 98422 47546
Compatible Accessories
- Mounting accessories — flange mounts, clevis brackets, and foot mounts from Festo's DSNU-S accessory range (order separately by bore size 8mm)
- Proximity switches — SME-series or SMT-series magnetic sensors for end-of-stroke position feedback; specify T-slot or clamp-band mounting style
- M5 push-in fittings — Festo QS-M5-4 or QSM-M5-4 push-in fittings for 4mm OD tubing; matched directly to the M5 port
- 4mm OD polyurethane tubing — PUN-4X0.75 or equivalent; compatible with all M5 push-in fittings
- Flow control valves — GRLA-M5 or GRLZ-M5 unidirectional flow controls for speed regulation on advance and return strokes
- Miniature solenoid valves — VUVG-L10 or MHE2 series for direct valve-to-cylinder mounting in space-constrained panels
- Piston rod couplings and connectors — M4 clevis joints and rod eyes to interface with your load or linkage mechanism
All accessories available from stock at Murali Pneumatics, Coimbatore. Ask us to bundle your complete cylinder assembly — fittings, tubing, sensor, and mounting hardware — in a single order.
