Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20
The AirTAC SAIJ40X40-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 40 mm stroke that can be fine-tuned down by up to 20 mm, creating a precise 20-40 mm usable travel window. This allows for exact end-position calibration during commissioning without swapping hardware.
Delivering 628 N of push force at 0.5 MPa, this bore size utilizes a G1/4 port and a 16 mm rod. The rod is constructed from SUS304 stainless steel for enhanced corrosion resistance. It features variable air cushions at both ends to decelerate the load, though the rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 40 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 SAIJ40BX40-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 SAIJ40BX40-20 Is Used
Precision End-Stop Tuning
Dial in the exact 20-40 mm travel distance during machine commissioning to perfect component seating without machining external spacers.
Product Size Changeover
Quickly adjust the cylinder's extended position on packaging lines when running different product heights, minimizing downtime.
Variable Assembly Stroke
Adapt the actuation depth for pressing or clamping operations on the fly, ensuring delicate parts are not crushed during setup.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20 the Right Cylinder?
Select this 40 mm bore when an application requires 628 N of push force at 0.5 MPa but demands variable end-stops for product changeovers. If less force is needed, stepping down to a 32 mm bore yields 402 N. Choosing the SAIJ over a fixed SAI cylinder eliminates the need to bolt on external stops or buy multiple cylinders for slightly different travel lengths.
When matching ISO 15552 replacements, verify the 40 mm bore, 40 mm stroke, 20 mm adjustment range, PT tapered port threads, and the SUS304 rod material. Note that SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options. For load-holding without live air, consider an external rod lock or the SAIL series instead.
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 SAIJ40BX40-20 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 allows you to trim the 40 mm nominal stroke back by up to 20 mm, providing a usable travel window of 20-40 mm. This stopper sets the end position but does not lock the load without continuous air pressure.
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