Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20
The AirTAC SAIJ40 Adjustable Cylinder SAIJ40BX70-20 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 interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ40 mm
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20
The AirTAC SAIJ40X70-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window down to a 50-70 mm range. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
This specific SKU is configured with a SUS304 stainless steel rod (option B) for superior corrosion resistance and features PT tapered port threads. Unlike a fixed-stroke SAI unit, the external rear stopper lets you dial in the exact retract position during commissioning or product changeover without adding external stops. The adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20 |
|---|---|
| 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 | 528 N | 528 N |
| 0.7 MPa | 739 N | — |
| Max (@1.0 MPa) | 108 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20
| 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 SAIJ40BX70-20 Is Used
Machine Changeover
Dial in the 50-70 mm travel window during product size changes on a packaging line, ensuring precise retract positions without swapping out the entire cylinder.
Assembly End-Stop Tuning
Fine-tune the final retract position during initial commissioning to perfect a pressing or clamping operation, avoiding the need to bolt on external mechanical stops.
Variable Diverter Stroke
Adjust the actuation length on the fly for a conveyor sorting gate that handles varying package sizes, using the rear screw to set the exact travel limit.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20 the Right Cylinder?
Choose this 40 mm bore when your application requires a nominal 70 mm stroke but demands precise end-positioning at setup. The rear adjuster is ideal for variable end stops and machine changeovers, whereas a fixed SAI cylinder is better suited for set-and-forget rigid stops. Remember that the SAIJ adjuster and air cushions only decelerate the travel end—neither will hold a load dynamically. For true fail-safe load holding without live air, consider an SAIL pneumatic lock, a BSAI clamp-lock, or an external pilot-operated check valve.
This model uses a PT tapered port thread and a SUS304 stainless steel rod. It supports the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Because it lacks the -S magnet suffix, it does not support AirTAC CMSE reed or DMSE electronic sensors without modification. Dimensionally interchangeable per ISO 15552, it operates at speeds of 30-800 mm/s.
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 SAIJ40BX70-20 FAQ
At its maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjusting screw acts as a mechanical stopper that lets you shorten the 70 mm nominal stroke by up to 20 mm, creating a usable 50-70 mm travel window. It only sets the end position and does not lock the load without live air pressure.
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