Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20
The AirTAC 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 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 SAIJ40BX70-20
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. Delivering 879 N of push force and 528 N of pull force at 0.7 MPa, it fits neatly into the mid-force tier for pneumatics. 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 | 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 SAIJ40BX70-20
| 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. If you need less force, stepping down to a 32 mm bore yields 563 N of push force at 0.7 MPa; stepping up to a 50 mm bore provides 1374 N. 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 a standard 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. 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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