Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 90mm 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
- Stroke90 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-20
The AirTAC SAIJ40X90-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that lets you dial back the nominal 90 mm travel by up to 20 mm, creating a precise 70-90 mm usable window. Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, it bridges the gap between smaller 32 mm bores and heavier 50 mm units. The extruded aluminum barrel includes sensor grooves on both sides, though this specific configuration omits the magnet option, meaning position sensing via CMSE reed or DMSE electronic switches is not enabled out of the box. The piston rod is constructed from SUS304 stainless steel for superior corrosion resistance, and the PT tapered port threads ensure a robust pneumatic connection.
Unlike a fixed-stroke SAI cylinder, this adjustable model allows you to fine-tune the retract end-position directly at commissioning or during product changeover without swapping the barrel or bolting on external stops. It is important to note the rear adjuster acts purely as a mechanical travel stop and works alongside the standard variable air cushions at both ends; it does not hold the load without live air pressure. For applications requiring true fail-safe load holding, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 90 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 SAIJ40BX90-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×90 | 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 SAIJ40BX90-20 Is Used
Machine Commissioning
Dial in the exact 70-90 mm travel during initial setup to perfect end-of-stroke positioning without machining custom spacers.
Product Changeover
Quickly adjust the retract stop by up to 20 mm when switching the production line to a different package or part size.
Variable End Stops
Use the rear stopper screw to set precise mechanical limits for repetitive clamping or pressing tasks within the 90 mm window.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-20 the Right Cylinder?
Choose this 40 mm bore when you need higher force than a 32 mm bore (402 N push at 0.5 MPa) but want to avoid the bulk of a 50 mm bore (982 N push). The 90 mm nominal stroke combined with a 20 mm adjustment range is ideal for setups requiring exact end-position tuning, such as accommodating varying part sizes on a single machine. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR options. To replace an ISO 15552 cylinder, match the 40 mm bore, 90 mm stroke, 20 mm adjustment, PT port thread, and SUS304 rod material. Because the stroke is under 300 mm, side-load stress on the 16 mm rod is minimal, though external guides are always recommended for optimal cylinder longevity.
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 SAIJ40BX90-20 FAQ
At a standard 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the nominal 90 mm down to as little as 70 mm. This provides a 70-90 mm usable window for fine-tuning the end position without replacing the cylinder.
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