Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 950mm 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
- Stroke950 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-75S
The AirTAC SAIJ40X950-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates an 875-950 mm usable travel window. Delivering 628 N of push force at 0.5 MPa, it is equipped with a SUS304 stainless steel rod for superior corrosion resistance and pairs seamlessly with CMSE or DMSE sensors via its integrated magnet.
The rear stopper mechanism allows precise end-position tuning during commissioning without adding external stops. It is essential to note that this adjuster acts solely as a travel stop and does not function as a lock; the cylinder cannot hold loads without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 950 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 SAIJ40BX950-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×950 | 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 SAIJ40BX950-75S Is Used
Machine Changeover
Fine-tune the 875-950 mm travel window during product size changes without physically replacing the actuator.
Variable End-Stop Positioning
Adjust the retract stroke length on the fly to accommodate different package sizes moving down a packaging line.
Commissioning Calibration
Dial in the exact end position during machine setup to perfect timing and avoid mechanical hard stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-75S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore falls short of the required thrust (offering 402 N at 0.5 MPa) but a 63 mm bore (1559 N) would be excessive. The 75 mm adjustment range is ideal for product changeovers, letting you dial in the exact end-stop on the fly instead of swapping out a fixed-stroke SAI cylinder. If your application requires true load-holding without continuous air pressure, consider the SAIL or BSAI series instead.
Because the 950 mm stroke is substantial, the 16 mm diameter rod with an M12x1.25 thread will still experience deflection under high side loads. Always use an external guide rail to support the load and prevent premature seal wear. For a direct ISO 15552 replacement, match the 40 mm bore, 950 mm stroke, 75 mm adjustment, PT tapered ports, and the -S magnet.
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 SAIJ40BX950-75S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw lets you shorten the effective stroke by up to 75 mm, providing a usable travel window of 875 to 950 mm. This allows precise end-position tuning without swapping cylinders, though it acts as a stop and not a load lock.
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