Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-30S
The AirTAC SAIJ40X900-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 900 mm stroke that can be dialed back by up to 30 mm, yielding a usable travel window of 870-900 mm for precise end-position tuning during commissioning. Delivering 628 N of push force at 0.5 MPa, it features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for CMSE and DMSE electronic solid-state or reed sensors.
This model uses PT tapered port threads and relies on a 30 mm air cushion at both ends to decelerate the piston. The rear adjuster acts purely as a mechanical stop to set the retract end position; it does not lock or hold the load without live air pressure. For applications requiring true load-holding without continuous air, an external rod lock or pilot-operated check valve is necessary.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 900 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 SAIJ40BX900-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×900 | 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 SAIJ40BX900-30S Is Used
Machine Changeover
Dial in the 870-900 mm travel window during product size changes without swapping out the entire actuator assembly.
End-Stop Calibration
Fine-tune the retract end position at commissioning using the rear adjuster screw to perfect tooling alignment.
Variable Length Diverter
Adjust the stroke on the fly to accommodate different package lengths moving down a packaging line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-30S the Right Cylinder?
Choose this adjustable-stroke SAIJ over a fixed SAI when your machine setup requires variable end-stops or product-size changeovers without physically swapping the cylinder or adding external stopper blocks. If your application demands higher thrust, stepping up to a 50 mm bore yields 982 N at 0.5 MPa, but the 40 mm bore is ideal for moderate loads. To match this exact ISO 15552 replacement, specify: 40 mm bore, 900 mm stroke, 30 mm adjustment, PT ports, SUS304 (B) rod material, and the -S magnet option.
Because the stroke is 900 mm, the 16 mm rod and M12x1.25 rod thread will experience significant leverage under side loads. An external guide rail should be used to prevent binding and premature seal wear over this long unsupported travel.
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 SAIJ40BX900-30S FAQ
The -30 code means the 900 mm nominal stroke can be mechanically shortened by up to 30 mm via a rear stopper screw. This provides an adjustable usable travel window of 870-900 mm, allowing you to fine-tune the end position without altering the cylinder's mounting.
At a 0.5 MPa operating pressure, the SAIJ40X900-30-S provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1130 N of push force.
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