Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40S
The AirTAC SAIJ40X425-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 879N of push force at 0.7 MPa and features a built-in magnet for position sensing. The -40 code designates a 40mm adjustment range, creating a usable travel window of 385-425mm for precise end-position tuning without swapping out the unit.
This specific SKU is configured with a SUS304 stainless steel rod for superior corrosion resistance and a PT tapered port thread. It retains the standard extruded aluminum barrel with dual sensor grooves, making it directly interchangeable with ISO 15552 cylinders such as the SMC CA2 or Festo DNC. The rear stopper acts solely as a travel limit, not a lock, meaning live air is required to hold the load.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 425 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 SAIJ40BX425-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×425 | 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 SAIJ40BX425-40S Is Used
Product Changeover
Dial in the 385-425mm travel window during packaging line format changes to accommodate different carton sizes without changing the cylinder.
Machine Setup
Fine-tune the retract end-position at commissioning to dial out mechanical interference, using the rear stopper instead of adding external shims.
Variable End Stops
Adjust the stroke on the fly for diverter gates that need to sit at different retracted positions depending on the product flow.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40S the Right Cylinder?
Choose this 40mm bore when an application requires fine-tuning the retract distance during machine setup or product changeover, avoiding the need to bolt on external stops. If you need less force, the 32mm bore provides 402N at 0.5 MPa; for heavier payloads, stepping up to the 50mm bore yields 982N at 0.5 MPa. Because this model features a 425mm stroke, an external guide is recommended to prevent excessive side-loading on the 16mm rod.
For an ISO 15552 replacement match, verify the 40mm bore, 425mm stroke, 40mm adjustment range, PT port, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR variants. If the machine requires true load-holding without continuous air pressure, use an external rod lock or pilot-operated check valve, or select the SAIL or BSAI series.
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 SAIJ40BX425-40S FAQ
At 0.5 MPa it provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N. The maximum operating pressure is 1.0 MPa.
The rear adjuster allows you to shorten the effective stroke by up to 40mm from the nominal 425mm, providing a usable travel window of 385-425mm. It functions as a mechanical stop and does not lock the load without live air.
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