Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-75 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 SAIJ40BX225-75
The AirTAC SAIJ40X225-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the nominal 225 mm travel back by up to 75 mm, yielding a precise 150-225 mm usable window. This built-in stopper allows mechanics to fine-tune the retract end-position during commissioning without swapping the barrel or adding external stops. It delivers 879N of push force at 0.7 MPa and uses a G1/4 port.
This variant features a SUS304 stainless steel rod for corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-75 |
|---|---|
| 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 SAIJ40BX225-75
| 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 SAIJ40BX225-75 Is Used
Machine Changeover
Dial in the 150-225 mm travel window during product size transitions to set new retract positions instantly without changing hardware.
End-Stop Tuning
Fine-tune the final retract position during commissioning to absorb mechanical tolerance stacks and hit exact locating dimensions.
Variable Positioning
Provide adjustable physical stops on an automated line where multiple end-of-stroke positions are required for different assemblies.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-75 the Right Cylinder?
Choose this 40 mm bore when an application requires 879N of push force at 0.7 MPa, stepping up from a 32 mm bore (563N) for heavier pushing, or down from a 50 mm bore (1374N) to save space. The 75 mm adjustment range is ideal for machines handling frequent product-size changeovers, providing variable end-stops on the fly. For strokes of 225 mm or more, the 16 mm rod and M12x1.25 thread handle moderate side loads, but an external guide is recommended for unsupported loads. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. To replace an ISO 15552 cylinder, match the 40 mm bore, 225 mm stroke, 75 mm adjust, PT port, and no magnet. For load-holding without air, use a SAIL or BSAI cylinder.
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 SAIJ40BX225-75 FAQ
At 0.7 MPa, this 40 mm bore cylinder provides 879N of push force and 528N of pull force. It delivers 1130N of push force at 0.9 MPa.
The rear adjuster acts as an external stopper that shortens the 225 mm nominal stroke by up to 75 mm, creating a 150-225 mm usable travel window. It sets the end position but does not lock the load without live air.
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