Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-50S 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 SAIJ40BX225-50S
The AirTAC SAIJ40X225-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force and 528N of pull force at 0.5 MPa, utilizing a 16mm piston rod and G1/4 porting. Because of the 50mm adjustment code, this SKU provides a usable travel window of 175 to 225mm, allowing you to dial back the nominal 225mm stroke precisely during machine commissioning without swapping out the physical cylinder.
This specific configuration features a SUS304 stainless steel rod (option B) for superior corrosion resistance and includes a magnet (-S) for electronic position sensing. The extruded aluminum barrel incorporates sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE solid-state switches. The rear adjuster acts purely as a mechanical stop to set the retract end-position, meaning it will not hold a load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-50S |
|---|---|
| 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 SAIJ40BX225-50S
| 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 SAIJ40BX225-50S Is Used
Machine Changeover
Quickly modify the retract end-stop from 175 to 225mm during product format changes on a packaging line, eliminating the downtime of physically swapping cylinders.
End-Position Tuning
Fine-tune the final resting position of a tooling head at commissioning, using the rear screw to absorb mechanical tolerances without adding external shims.
Variable Eject Station
Adjust the ejection stroke length on the fly for different part sizes, relying on the SUS304 stainless rod for durability in industrial environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-50S the Right Cylinder?
Select this 40mm bore adjustable cylinder when your application requires exact end-position tuning at commissioning or frequent product-size changeovers, avoiding the need to bolt on external stops or purchase multiple fixed-stroke SAI variants. If your setup demands higher thrust, stepping up to the 50mm bore yields 982N of push force at 0.5 MPa; dropping down to the 32mm bore provides 402N.
For a seamless ISO 15552 replacement match, verify the 40mm bore, 225mm nominal stroke, 50mm adjustment range, PT tapered port thread, and the -S magnet option. Since the 225mm stroke exceeds 300mm is false here, standard side-load precautions apply, though an external guide is always recommended for heavy lateral loads. Remember that neither the rear adjuster nor the air cushions function as a lock; for true fail-safe load holding without live air, consider the AirTAC SAIL or BSAI series instead.
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 SAIJ40BX225-50S FAQ
At an operating pressure of 0.5 MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At the maximum pressure of 1.0 MPa, it delivers up to 128kgf.
The rear adjuster screw allows you to shorten the effective stroke by up to 50mm. This means the 225mm nominal stroke can be fine-tuned to any usable travel length between 175mm and 225mm without changing the cylinder itself.
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