Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 280mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ50 mm
- Stroke280 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 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 SAIJ50 Adjustable Cylinder SAIJ50AX280-40
The AirTAC SAIJ50X280-40 is a double-acting ISO 15552 profile cylinder with a 50mm bore and a 280mm nominal stroke. An integrated rear adjusting screw allows you to shorten the effective travel by up to 40mm, providing a usable 240-280mm stroke window. This fine-tuning capability is ideal for dialing in exact end positions during commissioning without swapping out the entire actuator or adding bulky external stops. Delivering 982N of push force at 0.5 MPa, it handles robust positioning tasks while maintaining a standard ISO 15552 mounting footprint.
This variant features a SUS420J2 stainless steel rod (material code A) for superior corrosion resistance compared to standard carbon steel. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to drop in CMSE reed or DMSE electronic sensors later without modifying the assembly. Ports use a PT tapered thread, and the cylinder relies on variable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 280 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×280 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 240-280mm window to accommodate varying material thicknesses on the fly without changing out physical spacers.
Product Changeover Systems
Quickly reconfigure the stroke length during production line changeovers, using the 40mm adjustment range to handle different package sizes.
Machine Setup Fine-Tuning
Perfectly sync multiple actuators during commissioning by trimming the end position up to 40mm, ensuring precise mechanical timing without external stops.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40 the Right Cylinder?
Select this 50mm bore when an application requires around 982N of push force (or 825N pull) at 0.5 MPa. If you need less force, stepping down to a 40mm bore yields 628N; stepping up to a 63mm bore provides 1559N. The 40mm rear adjuster on this SAIJ50X280-40 is specifically chosen over a fixed-stroke SAI when a machine setup requires a variable end-stop for product changeovers or precise mechanical syncing.
Because the 280mm stroke exceeds the 300mm threshold, long unsupported strokes can generate high side-load friction on the rod seal and bearing. Even with the 20mm rod and M16x1.5 thread, you should use an external guide rail to support heavy loads. Remember that the rear adjuster is a travel stop, not a lock; the SAIJ cannot hold a load without live air pressure. For fail-safe load holding, use an external rod lock or pilot-operated check valve. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/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/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40 FAQ
At 0.5 MPa operating pressure, the 50mm bore provides 982N of push force and 825N of pull force. If you increase the pressure to 0.9 MPa, the push force reaches 1767N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 280mm nominal stroke by up to 40mm, creating a usable travel window of 240-280mm. It is a travel stop, not a lock, so it cannot hold the load without continuous air pressure.
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