Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 225mm 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
- Stroke225 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-50
The AirTAC SAIJ40X225-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 225 mm stroke that can be dialed back by up to 50 mm, creating a precise 175-225 mm usable travel window for commissioning flexibility. Delivering 628 N of push force at 0.5 MPa, it integrates a 16 mm piston rod and PT tapered port threads for robust pneumatic performance.
This model features a SUS304 stainless steel rod (code B) for superior corrosion resistance in demanding environments. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to add CMSE reed or DMSE electronic switches if position feedback is required later. It utilizes a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 225 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 SAIJ40BX225-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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 SAIJ40BX225-50 Is Used
Machine Changeovers
Dial in the 175-225 mm retract position during product size changes without physically swapping cylinders or reworking fixed stop blocks.
End-Position Tuning
Fine-tune the final end-of-stroke location during commissioning to perfect seating or clamping forces against varying material thicknesses.
Variable Stops
Provide an adjustable physical stop for diverter arms or pushing mechanisms on packaging lines that handle multiple package lengths.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-50 the Right Cylinder?
Select this 40 mm bore when an application requires 628 N push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) if extra thrust is needed, or down from a 50 mm bore (982 N) to save space. The 50 mm adjustment range is ideal for product changeovers, letting you fine-tune the retract end position without swapping the cylinder or adding external stops. For fixed-position tasks without variance, a standard SAI cylinder is simpler.
Because the 225 mm stroke exceeds 200 mm, ensure an external guide supports the load to prevent excessive side-loading on the 16 mm rod. Remember that the rear adjuster acts only as a travel stop, not a lock; the SAIJ will not hold a load without live air, so consider an AirTAC SAIL or BSAI cylinder if true load-holding is required. Replacement requires matching the 40 mm bore, 225 mm stroke, PT port, and the desired adjustment range.
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 SAIJ40BX225-50 FAQ
At 0.5 MPa operating pressure, 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 shorten the effective stroke by up to 50 mm from the 225 mm nominal length, providing a usable travel window of 175-225 mm. It acts as a mechanical stop to set the end position and is not a lock.
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