Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-50S
The AirTAC SAIJ40X275-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force at 0.5 MPa and features a 50mm adjustment range, creating a precise 225-275mm usable travel window for fine-tuning the retract end position during commissioning. The integrated -S magnet supports position sensing via AirTAC CMSE reed and DMSE electronic switches.
This variant utilizes a SUS304 stainless steel rod for superior corrosion resistance and carries a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 275 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 SAIJ40BX275-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×275 | 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 SAIJ40BX275-50S Is Used
Machine Changeover
Dial in the 225-275mm travel window during product size changes without physically replacing the cylinder or repositioning hard stops.
End-Position Tuning
Fine-tune the retract stroke at commissioning to perfect alignment, absorbing mechanical tolerances directly via the rear adjustment screw.
Variable Diverter Stops
Adjust the stroke on the fly for conveyor lines handling different package sizes, using the 50mm trim range to reposition the diverting arm.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-50S the Right Cylinder?
Choose this 40mm bore when an application requires moderate force and variable end-stops without swapping cylinders or adding external stops. If you need less force, stepping down to a 32mm bore yields 402N at 0.5 MPa; stepping up to a 50mm bore provides 982N. Because the 275mm stroke exceeds 300mm is false here, but for any stroke over 300mm, ensure external guides support the load to prevent rod side-load wear.
The rear adjuster acts solely as a travel stop and does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI cylinder series. To match this ISO 15552 interchangeable cylinder exactly, specify: 40mm bore, 275mm stroke, 50mm adjustment, PT port, SUS304 rod, and a magnet for sensors.
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 SAIJ40BX275-50S FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear adjuster screw allows you to shorten the nominal 275mm stroke by up to 50mm, creating a usable travel window of 225-275mm. It functions as a mechanical stop and does not lock the load without live air pressure.
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