Airtac SDA Ultra Thin Cylinder SDA40X25-S-H
The AirTAC Airtac SDA Ultra Thin Cylinder SDA40X25-S-H is a genuine double-acting COMPACT (thin) air cylinder with a Ø40mm bore and 25mm stroke, PT1/8 air ports and a riveted short body that saves mounting depth. Sensor slots around the body accept magnetic switches for position sensing.
- BoreØ40 mm
- Stroke25 mm
- Port sizePT1/8
- Acting typeDouble acting
- Rod threadM8×1.25 (F) / M14×1.5 (B)
- CushionFixed NBR bumper (both ends)
About the Airtac SDA Ultra Thin Cylinder SDA40X25-S-H
The AirTAC SDA40X25-S-H is a double-acting single-rod compact cylinder engineered for tight axial spaces. Its riveted assembly unites the barrel, rear cover, piston, and rod to minimize mounting depth, yielding a robust 628.3 N push at 0.5 MPa. This specific configuration includes a built-in piston magnet (-S) for position sensing and fluororubber (-H) seals for enhanced thermal and oil resistance.
The 40 mm bore features a 16 mm piston rod and PT1/8 ports. End-of-stroke deceleration relies on a fixed NBR bumper rather than an adjustable air cushion, meaning external shock absorbers should be specified for high-energy cycles. Grooves around the hard-anodized body accept AirTAC reed or electronic switches.
Airtac SDA Ultra Thin Cylinder SDA40X25-S-H Technical Specifications
| Model | Airtac SDA Ultra Thin Cylinder SDA40X25-S-H |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| Port size | PT1/8 |
| Rod end thread | M8×1.25 female / M14×1.5 male (B) |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Fixed NBR bumper (both ends) |
| Max standard stroke | Up to 120 mm |
Specifications follow the official AirTAC SDA compact-cylinder datasheet. Confirm against the product label before installation. Port thread: PT (standard). Rod: female thread (blank) / male thread (B).
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SDA Ultra Thin Cylinder SDA40X25-S-H
| SDA | Compact (thin) double-acting cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×25 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
| B | Male-thread piston rod (omit = female-thread rod). |
Thread: PT standard. Related SDA-family variants: SSA (single-acting push), STA (single-acting pull), SDAD (double rod), SDAJ (adjustable stroke), SDAT (duplex), SDAW (duplex-end).
Where the Airtac SDA Ultra Thin Cylinder SDA40X25-S-H Is Used
CNC Fixture Clamping
Secures aluminum workpieces in CNC machining centers using 628.3 N of extend force, with FKM seals resisting coolant spray.
Carton Flap Folding
Drives short 25 mm folding strokes on high-speed packaging lines where the compact riveted body minimizes machine footprint.
Stamping Pin Ejection
Ejects small stamped metal pins from progressive dies, relying on the 16 mm rod to withstand repetitive lateral stress.
Is the Airtac SDA Ultra Thin Cylinder SDA40X25-S-H the Right Cylinder?
When sizing this actuator, evaluate your neighbors: the SDA32 provides 402.1 N push at 0.5 MPa, while the SDA50 steps up to 981.7 N. For the SDA40X25-S-H, the safe working load is approximately 377 N (60% of the 0.5 MPa figure), translating to a vertical lift capacity of about 32 kg with a 2:1 safety margin. Confirm your ordering essentials: 40 mm bore, 25 mm stroke, PT1/8 port, female M8x1.25 rod thread, the -S magnet, and -H FKM seals.
Remember that a standard compact cylinder drifts when air pressure is lost or the valve is centered. The fixed bumper only decelerates the piston near stroke end and does not function as a locking brake. If your application must hold a load safely without live pressure, integrate an external rod lock or a pilot-operated check valve.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Short-body depth vs. a round-body cylinder
- ✓ Port/thread type (PT)
- ✓ Magnet (S) for sensors?
- ✓ Female (blank) or male (B) rod thread
- ✓ Side load — avoid on a compact rod
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the short piston rod.
- check Very long strokes are unsuitable for the compact body.
- check Front/rear covers are riveted — do not dismantle.
- check Installation by qualified personnel per AirTAC docs.
Airtac SDA Ultra Thin Cylinder SDA40X25-S-H FAQ
This 40 mm bore double-acting cylinder generates 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum push is 128 kgf at 1.0 MPa. Operating pressure spans 0.15-1.0 MPa, with a speed range of 30-500 mm/s.
It uses a fixed NBR bumper at each end to decelerate the piston, which is not a field-adjustable air cushion. For high-speed cycles, add external shock absorbers. The -S code denotes a built-in magnet compatible with AirTAC reed or electronic switches mounted in the body grooves.
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