Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X210-20S
The AirTAC Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X210-20S is a genuine double-acting profile-type standard air cylinder with a Ø40mm bore and 210mm stroke, 1/4" air ports and adjustable end cushioning. Its hard-anodized aluminum-profile barrel is shorter than an ISO 15552 cylinder of the same bore, and it shares SC-series mounting accessories.
- BoreØ40 mm
- Stroke210 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X210-20S
The AirTAC SAUJ40X210-20S is a double-acting, single-rod profile cylinder with an on-site adjustable extend stroke. An external stop screw lets you shorten the 210 mm nominal travel by up to 20 mm, yielding a usable 190-210 mm window without buying a new actuator. The extruded aluminum profile barrel makes it shorter than an ISO 15552 cylinder of the same 40 mm bore. It features a 1/4" port, an M12x1.25 rod thread, and 21 mm adjustable air cushions.
This bore delivers 628 N push and 528 N pull at 0.5 MPa, peaking at 1130 N push at 0.9 MPa. A practical computed insight: the safe working load is roughly 377 N (about 60% of the 0.5 MPa push force), translating to a 32 kg vertical lift capacity with a 2:1 safety margin. The -S suffix means a built-in piston magnet is present for CMSG, DMSG, or EMSG position sensing.
Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X210-20S Technical Specifications
| Model | Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X210-20S |
|---|---|
| Series | SAU profile-type cylinder |
| Bore size | Ø40 mm |
| Stroke | 210 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAU series datasheet. Confirm against the product label before installation. Thread options: PT (blank) / G (BSPP). A high-temperature seal (0-150 °C) is available.
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 SAUJ40 Adjustable Stroke Cylinder SAUJ40X210-20S
| SAU | Profile-type standard cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×210 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAU-family variants: SAUD (double rod), SAUJ (adjustable stroke), SAUF (with built-in solenoid valve), and SAU-S with built-in magnet. Seals: TPU (blank) / Viton H / NBR N. Sensor switches: CMSG / DMSG / EMSG.
Where the Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X210-20S Is Used
Clamp Stroke Calibration
Trimming the extend stroke by up to 20 mm on-site allows operators to dial in the exact clamping force on variable-thickness workpieces without swapping actuators.
Transfer Diverter Tuning
Adjusting the pusher end position precisely matches the diverter angle for different package sizes on a packaging line.
Component Insertion
Fine-tuning the 210 mm downstroke ensures delicate parts are seated to the correct depth without bottoming out and causing damage.
Is the Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X210-20S the Right Cylinder?
Size this 40 mm bore against its neighbors: a 32 mm bore gives 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. Choose the 40 mm when your load requires the 628 N @0.5 MPa output. Pick the SAUJ over a fixed SAU when you need final end-position tuning during machine commissioning or to accommodate part variance without machining external stops. The -20 adjust window is ideal for fine-tuning within a 20 mm range. Basic, FA flange, and LB foot mountings are available (sharing SC series hole patterns). The -S magnet enables electronic or reed sensors. Because the 210 mm stroke is under 300 mm, side-load risks are lower, but always guide the load for optimal seal life.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
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 piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB — same as SC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X210-20S FAQ
At 0.5 MPa it provides 628 N push and 528 N pull. Push force is 879 N at 0.7 MPa and 1130 N at 0.9 MPa, with a theoretical max of 128 kgf at 1.0 MPa. The external stop screw allows you to shorten the 210 mm extend stroke by up to 20 mm on-site, giving a usable 190-210 mm range.
The -S suffix indicates a built-in piston magnet for mounting CMSG, DMSG, or EMSG sensors for position detection. Note that a plain cylinder does not hold load on air loss; the piston drifts and the cushion only decelerates. The stop screw sets end position but is not a load lock. For held loads, use an external rod lock or pilot-operated check valve.
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