Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-40 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 SAIJ40BX40-40
The AirTAC SAIJ40X40-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to trim the effective travel anywhere within a 0-40 mm window. Delivering 628 N of push force at 0.5 MPa, it is engineered for applications requiring exact end-position tuning during commissioning without the need to swap hardware. The extruded aluminum barrel includes sensor grooves on both sides, while the piston rod is constructed from SUS304 stainless steel for superior corrosion resistance.
This model features PT tapered port threads and uses an M12x1.25 rod thread. The rear adjuster functions strictly as a mechanical stop to set the retraction end-point; it does not hold the load without continuous air pressure. For load-holding requirements without live air, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-40 |
|---|---|
| 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 SAIJ40BX40-40
| 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 SAIJ40BX40-40 Is Used
Machine Changeovers
Dial in the exact retraction stop during product size transitions without swapping out the entire cylinder or adding external mechanical stops.
End-Position Tuning
Fine-tune the 0-40 mm travel window during initial commissioning to perfectly align tooling and compensate for mechanical tolerances.
Corrosive Environments
The SUS304 stainless steel rod provides reliable actuation and precise stroke adjustment in washdown or mildly corrosive industrial settings.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-40 the Right Cylinder?
Choose this 40 mm bore when your application demands a 628 N push force at 0.5 MPa and a highly variable end-stop within a 0-40 mm travel window. If your setup requires less force, stepping down to a 32 mm bore yields 402 N, whereas stepping up to a 50 mm bore provides 982 N. The adjustable stroke is ideal for product changeovers on a line, allowing you to fine-tune the retraction distance on the fly rather than relying on a fixed-stroke SAI cylinder.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 40 mm stroke, PT port threads, and the desired mounting accessory from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Note that this series omits FB, CA, CB, and CR mounts. Because the standard speed range is 30-800 mm/s, ensure your flow controls are correctly set to prevent end-of-stroke shock.
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 SAIJ40BX40-40 FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the nominal 40 mm stroke by up to 40 mm, providing a usable travel window of 0-40 mm. It sets the end position but does not lock or hold the load without continuous air pressure.
At 0.5 MPa operating pressure, the SAIJ40X40-40 generates 628 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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