Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm 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.
- BoreØ40 mm
- Stroke280 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-50S
The AirTAC SAIJ40X280-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 230-280 mm, allowing you to dial back the 280 mm nominal stroke by up to 50 mm during commissioning. Delivering 879 N of push force at 0.7 MPa, it handles moderate thrust requirements with precision.
This variant features a SUS304 stainless steel rod (code B) for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and because this is an -S model, it includes a magnet ready for CMSE reed or DMSE electronic solid-state switches. The rear adjuster acts purely as a mechanical stop to set the end position; it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 280 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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, 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 (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 SAIJ40 Adjustable Cylinder SAIJ40BX280-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX280-50S Is Used
Product Changeover
Fine-tune the 230-280 mm travel window on packaging lines to accommodate different carton sizes without changing hardware.
End-Position Tuning
Dial in the exact retract stop during machine commissioning to prevent overshooting and ensure precise tool placement.
Sensor-Ready Automation
Leverage the integrated magnet with DMSE electronic sensors for exact position feedback in variable-stroke assemblies.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-50S the Right Cylinder?
Choose this 40 mm bore when your application needs around 879 N of push force at 0.7 MPa, stepping up from a 32 mm bore (563 N) for heavier work, or stepping down from a 50 mm bore (1374 N) to save space. An adjustable stroke is ideal for machine setups requiring variable end-stops or product-size changeovers without physically swapping out the cylinder or adding external stops. For load-holding without continuous air pressure, this cylinder is not a lock; you would need to specify an SAIL or BSAI series instead. Since the 280 mm stroke is substantial, ensure you use an external guide to prevent rod side-loading, even with the robust 16 mm rod and M12x1.25 thread. It uses the standard SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and is dimensionally interchangeable per ISO 15552.
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 SAIJ40 Adjustable Cylinder SAIJ40BX280-50S FAQ
At 0.7 MPa, the 40 mm bore provides 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from 280 mm down to 230 mm. It sets the travel end but does not lock the load without live air pressure.
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