Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40S
The AirTAC SAIJ125X900-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 900 mm stroke that can be fine-tuned backward by up to 40 mm, yielding a usable travel window of 860-900 mm. This allows precise end-position calibration during commissioning without adding external stops. It delivers 6136 N of thrust at 0.5 MPa, scaling up to 11045 N at 0.9 MPa.
Built with a SUS420J2 stainless steel rod (code A), this unit handles demanding environments while operating at 30-500 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated -S magnet works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches. It uses PT tapered port threads and includes variable air cushions at both ends to manage deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | 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 SAIJ125 Adjustable Cylinder SAIJ125AX900-40S Is Used
Product Changeover
Dial the rear stopper back by up to 40 mm to accommodate varying package sizes on a packaging line without changing cylinder hardware.
Machine Setup
Fine-tune the 860-900 mm end-position during initial commissioning to align heavy press tools perfectly without external shims.
Variable End Stops
Adjust the retract position on the fly for automated material handling gates that require different stroke lengths per batch.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N at 0.5 MPa) lacks the force for heavy positioning, but stepping up to a 160 mm bore (10053 N at 0.5 MPa) would be excessive overkill. The adjustable stroke is ideal for product changeovers on a line, letting you dial in the exact 860-900 mm end-stop without swapping the cylinder. For a fixed travel length without the rear adjuster, the standard SAI cylinder is the alternative.
Because the stroke is 900 mm, an external guide is strongly recommended to prevent side-load damage to the rod and seals. The rear adjuster and air cushions only set the travel end and decelerate the load; they do not hold the load without live air. For true fail-safe load holding, select the SAIL (air-released lock) or BSAI (clamp-lock) series. This SAIJ model uses the reduced mounting set: Basic, FA, LB, TC, FTC, TCM1, TCM2.
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 SAIJ125 Adjustable Cylinder SAIJ125AX900-40S FAQ
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop that trims the nominal 900 mm stroke back by up to 40 mm, giving an effective travel window of 860-900 mm. It only sets the end position and does not lock the load without live air.
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Standard models usually ship in 3-4 days.
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