Airtac SAIJ40 Adjustable Cylinder SAIJ40AX90-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40AX90-50 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 SAIJ40AX90-50
The AirTAC SAIJ40X90-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 90 mm stroke that can be dialed back by up to 50 mm, yielding a highly flexible 40-90 mm usable travel window for precise end-position tuning at commissioning. Delivering 628 N of push force at 0.5 MPa, this 40 mm bore actuator is built with a SUS420J2 stainless steel rod for enhanced corrosion resistance and features a PT tapered port thread.
The rear adjuster acts purely as a mechanical stop to set the retract position without needing external stops, while the standard air cushion handles end-of-stroke deceleration. It is dimensionally interchangeable per ISO 15552 and uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. Note that neither the adjuster nor the cushion holds the load without live air; for pilot-operated locking, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40AX90-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40AX90-50 |
|---|---|
| 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 SAIJ40AX90-50
| 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 SAIJ40AX90-50 Is Used
Variable End-Stop Tuning
Dial in the exact retract distance between 40 and 90 mm during machine commissioning without swapping out the entire actuator or adding bulky external stopper blocks.
Product Size Changeover
Quickly adjust the stroke length on packaging or sorting lines to accommodate different product sizes on the fly, minimizing downtime between production runs.
Corrosion-Resistant Positioning
Leverage the SUS420J2 stainless steel rod for light-duty pushing and clamping tasks in environments where standard carbon steel rods might face moisture or mild chemicals.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX90-50 the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires variable end-stops or frequent product-size changeovers, stepping up from a 32 mm bore (402 N push at 0.5 MPa) if you need extra thrust. The 50 mm adjustment range on a 90 mm stroke provides exceptional setup flexibility compared to a fixed-stroke SAI cylinder. When specifying an ISO 15552 replacement, match the 40 mm bore, 90 mm nominal stroke, 50 mm adjust code, PT port, and mounting style. Since this configuration omits the -S magnet, position sensing requires adding a magnet or external switches.
With an M12x1.25 rod thread and a 16 mm rod diameter, the actuator handles moderate side loads well. However, if your mechanical setup involves long unsupported loads or high lateral forces, always incorporate an external guide rail to prevent premature seal wear. The standard operating speed range for this bore is 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 SAIJ40AX90-50 FAQ
At a standard operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. If pressure is increased to 0.7 MPa, the push force rises to 879 N.
The rear adjuster screw allows you to mechanically shorten the stroke by up to 50 mm. This creates a usable travel window of 40 to 90 mm, letting you fine-tune the end position at commissioning. The adjuster is a stop, not a lock, so it cannot hold a load without continuous air pressure.
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