Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-50
The AirTAC SAIJ40X400-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that creates a 350-400 mm usable travel window from its 400 mm nominal stroke. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod and PT tapered ports.
The integrated rear stopper allows you to fine-tune the retract end position during commissioning without adding external stops. Because the stroke reaches 400 mm, the 16 mm rod should be guided externally to prevent excessive side-loading. This adjustable stopper only sets the travel end and does not hold the load without live air.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAIJ40BX400-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SAIJ40BX400-50 Is Used
Product Changeovers
Dial in the exact retract distance from 350 to 400 mm during format size changes without swapping out the entire actuator.
End-Stop Calibration
Fine-tune the final resting position of tooling at machine commissioning using the rear adjuster instead of external shims.
Variable Stops
Handle varying package sizes on a single line by adjusting the stroke window to push items accurately to different stations.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-50 the Right Cylinder?
Choose this 40 mm bore when an application requires precise end-position tuning on the fly, stepping up from a 32 mm bore (402 N push at 0.5 MPa) if you need extra force, or down from a 50 mm bore (982 N) to save space. An adjustable stroke is ideal for product changeovers where the exact retract distance varies, unlike a fixed-stroke SAI cylinder.
For an exact ISO 15552 replacement, match the 40 mm bore, 400 mm stroke, 50 mm adjustment range, PT port thread, and required mounting style. Note that SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR. If the machine loses air, this cylinder will not hold its load; specify a SAIL or BSAI lock cylinder for fail-safe holding.
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 SAIJ40BX400-50 FAQ
The rear adjuster acts as a mechanical stop that lets you trim the effective travel back by up to 50 mm, creating a 350-400 mm usable window. It sets the end position but is not a lock, so the cylinder cannot hold a load without live air pressure.
At 0.5 MPa, it provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
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