Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-50S
The AirTAC SAIJ40X55-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 5-55 mm from its 55 mm nominal stroke. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and features a PT tapered port thread.
This model includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic sensors housed within the dual-side barrel grooves. The rear adjuster acts purely as a travel stop to fine-tune the end position during commissioning, meaning it cannot hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 55 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 SAIJ40BX55-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×55 | 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 SAIJ40BX55-50S Is Used
Product Changeover
Dial in the 5-55 mm travel window on the fly to accommodate different package sizes on a packaging line without changing the actuator.
End-Stop Calibration
Fine-tune the retract position during machine commissioning to prevent crashes and achieve precise mechanical alignment.
Corrosive Assembly
Leverage the SUS304 stainless steel rod for short-stroke clamping tasks in environments where moisture or mild chemicals are present.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-50S the Right Cylinder?
Choose this 40 mm bore if you need precise end-position tuning without swapping cylinders; if you require less force, the 32 mm bore provides 402 N at 0.5 MPa, while stepping up to the 50 mm bore yields 982 N. An adjustable stroke is ideal for machine setups requiring variable end-stops, contrasting with a fixed-stroke SAI cylinder. To match this ISO 15552 interchangeable cylinder, specify the 40 mm bore, 55 mm stroke, 50 mm adjustment, PT ports, SUS304 (B) rod, and the -S magnet.
For load-holding applications without continuous live air, note that this cylinder's adjuster is not a lock; you should instead explore an AirTAC SAIL or BSAI locking cylinder. Mounting options for this series include 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 SAIJ40 Adjustable Cylinder SAIJ40BX55-50S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to trim the effective stroke back by up to 50 mm from the 55 mm nominal length, creating a 5-55 mm usable travel window. It functions as a mechanical stop and does not lock the load without air pressure.
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