Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10
The AirTAC SAIJ40X550-10 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 550 mm travel by up to 10 mm. This creates a precise 540-550 mm usable window, enabling fine end-position tuning at commissioning without swapping the cylinder or adding external stops. It delivers 879 N of push force at 0.7 MPa.
This specific configuration features a SUS304 stainless steel rod (option B) for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and the rear adjuster acts purely as a travel stop—it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 550 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 SAIJ40BX550-10
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×550 | 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 SAIJ40BX550-10 Is Used
Machine Changeover
Dial in the 540-550 mm travel window during product size changes without physically swapping out the entire actuator.
End-Position Tuning
Fine-tune the retract stop at commissioning to absorb mechanical tolerances and achieve exact positioning.
Variable End Stops
Adjust the stroke length on the fly for diverter gates or pushers that handle multiple package sizes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10 the Right Cylinder?
Choose this 40 mm bore when an application requires moderate thrust (879 N push at 0.7 MPa) but demands exact end-position tuning; if you need higher force, stepping up to the 50 mm bore yields 1374 N. An adjustable stroke is ideal for machine setups requiring variable end-stops or product changeovers, whereas a fixed SAI cylinder suits fixed-pitch movements. For load-holding without continuous air pressure, consider the SAIL or BSAI series, as the SAIJ adjuster is not a lock.
Because this cylinder features a 550 mm stroke, the 16 mm rod and M12x1.25 thread should be paired with an external guide to prevent side-loading damage over the long unsupported travel. It uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. This SKU is configured with PT ports and lacks a magnet, so position sensing requires adding a -S variant for CMSE or DMSE switches.
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 SAIJ40BX550-10 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 739 N of pull force. Maximum thrust is 128 kgf at 1.0 MPa.
The rear adjuster screw allows you to shorten the 550 mm nominal stroke by up to 10 mm, providing a 540-550 mm travel window. It functions as a mechanical stop and does not lock the load without live air.
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