Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-50S 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 SAIJ125AX900-50S
The AirTAC SAIJ125X900-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 850 to 900 mm, allowing you to dial back the end position by up to 50 mm during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and because this unit includes a magnet (-S), it directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for precise end-of-travel detection.
This 125 mm bore model delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning. The piston rod is constructed from SUS420J2 stainless steel (code A), offering enhanced corrosion resistance compared to standard carbon steel. Equipped with PT tapered ports and a 40 mm cushion stroke at both ends, it safely decelerates substantial loads across its 900 mm travel.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-50S |
|---|---|
| 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 SAIJ125AX900-50S
| 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 SAIJ125AX900-50S Is Used
Product Changeover Tuning
Quickly reconfigure the retract end-stop by up to 50 mm when adapting a heavy-duty conveyor line to handle different package lengths.
Heavy Press Positioning
Leverage 6136 N of thrust at 0.5 MPa to accurately seat large components, using the fine travel adjustment to perfect the final clamping distance.
Automated Assembly Calibration
Dial in the exact 850-900 mm travel window during initial machine commissioning to prevent mechanical crashes without machining custom spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-50S the Right Cylinder?
Select this adjustable-stroke model when your machine setup requires variable end stops or frequent product-size changeovers, rather than relying on a fixed-stroke SAI cylinder. The rear adjuster acts purely as a travel stop to fine-tune the retract position, but it does not hold the load without live air pressure; for true load-holding without continuous pressure, consider an external rod lock, a pilot-operated check valve, or the AirTAC SAIL and BSAI locking cylinder series.
Because the 900 mm stroke is substantial, an external guide is highly recommended to prevent excessive side loading on the SUS420J2 rod. This SKU is dimensionally interchangeable with ISO 15552 cylinders and uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR brackets. When matching your ISO replacement, verify the 125 mm bore, 900 mm stroke, 50 mm adjustment, PT port thread, and the required -S magnet.
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 SAIJ125AX900-50S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It operates on filtered air at pressures from 0.15 to 1.0 MPa, with a speed range of 30-500 mm/s.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from 900 mm down to 850 mm. This allows precise end-position tuning during setup or product changeovers without swapping the cylinder, though it functions only as a stop and does not lock the load without live air.
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