Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40
The AirTAC SAIJ125X125-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N push force at 0.5MPa, utilizing a 32mm carbon steel rod and G1/2 porting. By incorporating a 40mm adjustment mechanism, this model provides a usable travel window of 85-125mm, allowing precise end-position tuning during commissioning without adding external stops.
This adjustable-stroke design is ideal for product changeovers on automated lines. It supports speeds of 30-500mm/s and includes variable air cushions at both ends. The rear adjuster acts strictly as a travel stop to decelerate the load, not as a lock, meaning live air pressure is required to hold position. For load-holding without pressure, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125X125-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125X125-40 Is Used
Machine Setup & Changeover
Dial in the exact 85-125mm retract distance during product size changes without swapping the cylinder or bolting on external stops.
Variable End-Stop Positioning
Fine-tune the rear travel limit on heavy-duty actuators to perfect the pressing or clamping depth on the fly.
Heavy-Duty Assembly Lines
Leverage 6136N of thrust at 0.5MPa for moving substantial jigs, while retaining the flexibility to trim up to 40mm of stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40 the Right Cylinder?
Select this 125mm bore cylinder when an application requires heavy thrust (6136N at 0.5MPa) alongside variable end-stops. If your force requirements are lower, stepping down to an 80mm bore yields 2513N at 0.5MPa. The 40mm adjustment range is chosen over a fixed-stroke SAI when machine setups demand frequent fine-tuning of the retraction distance. Replacement specifications must match the 125mm bore, 125mm stroke, PT threaded G1/2 port, and the SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because this is a profile cylinder, it is dimensionally interchangeable per ISO 15552.
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 SAIJ125X125-40 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw lets you shorten the nominal 125mm stroke by up to 40mm, creating an 85-125mm usable travel window. It functions as a travel stop and deceleration point, not a load-holding lock.
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