Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50
The AirTAC SAIJ125X140-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 90-140 mm usable travel window from its 140 mm nominal stroke. It delivers 6136 N of push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa, making it a robust choice for heavy-duty actuation. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE position switches.
This model uses a 32 mm carbon steel rod with an M27x2 thread and a 40 mm cushion at both ends to absorb kinetic energy. It features a PT tapered G1/2 port and operates at speeds of 30-500 mm/s. The rear adjustment screw acts purely as a travel stop for fine-tuning end positions during commissioning; it is not a locking mechanism and will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125X140-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125X140-50 Is Used
Variable End-Stop Tuning
Dial in the exact 90-140 mm travel distance during machine setup to accommodate varying product dimensions without changing hardware.
Heavy-Duty Changeover
Rely on 6136 N of thrust at 0.5 MPa to push heavy pallets into place, using the rear screw to fine-tune the final resting position.
Assembly Press Fitting
Achieve precise pressing depths for bearings or pins, leveraging the 40 mm air cushions to decelerate the massive moving load smoothly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-50 the Right Cylinder?
Choose this 125 mm bore when 80 mm (2513 N push at 0.5 MPa) is insufficient or 160 mm (10053 N) provides excessive force. An adjustable stroke is preferred over a fixed SAI when you need precise end-stop tuning during product changeovers without swapping the cylinder or adding external stops. For load-holding without live air, select a SAIL or BSAI cylinder instead.
As a dimensionally interchangeable ISO 15552 cylinder, verify your replacement matches the 125 mm bore, 140 mm stroke, 50 mm adjustment, PT G1/2 port, and standard carbon steel rod. Because the stroke is under 300 mm, external side-load guides are less critical than on longer strokes, but the robust 32 mm rod still handles greater bending loads than smaller bores. Supported mounts include Basic, FA, LB, TC, FTC, TCM1, and 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 SAIJ125X140-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 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 allows you to shorten the 140 mm nominal stroke by up to 50 mm, providing a usable travel window of 90-140 mm. This stopper only sets the end position and does not lock the load without air pressure.
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