Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40
The AirTAC SAIJ40X70-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the nominal 70 mm travel back by up to 40 mm, creating a highly flexible 30-70 mm usable window. This on-board stopper allows precise end-position tuning at commissioning without swapping the barrel or adding external stops. It delivers 628 N of push thrust and 528 N of pull thrust at 0.5 MPa, driven through PT tapered port threads.
Built with a SUS304 stainless steel rod for corrosion resistance, the 16 mm rod diameter and M12x1.25 thread provide robust side-load capacity. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE or DMSE switches, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2 options. The rear adjuster acts purely as a travel stop and deceleration aid alongside the adjustable air cushions, meaning it will not hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 70 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 SAIJ40BX70-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 SAIJ40BX70-40 Is Used
Machine Setup Changeover
Dial in the exact end position from 30 to 70 mm during product family changeovers without physically swapping the actuator.
Variable End-Stop Tuning
Fine-tune the retract stroke during commissioning to perfect the seating force of a pressing or clamping operation.
Corrosion-Resistant Actuation
Leverage the SUS304 stainless steel rod and 628 N thrust for general pneumatic automation in mildly humid plant environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40 the Right Cylinder?
Choose this 40 mm bore when 32 mm (402 N push at 0.5 MPa) is too weak, but 50 mm (982 N) is unnecessarily large. The 30-70 mm adjustable window is ideal for product-size changeovers on a line, letting operators dial in the exact end-stop without replacing the cylinder. For load-holding without continuous air pressure, this cylinder is insufficient as the adjuster is not a lock; consider SAIL or BSAI variants instead. To match this ISO 15552 replacement, specify: 40 mm bore, 70 mm stroke, 40 mm adjustment, PT ports, no magnet, and a SUS304 (B) rod.
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 SAIJ40BX70-40 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as an external stopper that shortens the 70 mm nominal stroke by up to 40 mm, giving a usable travel window of 30 to 70 mm for fine-tuning the end position.
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