Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50
The AirTAC SAIJ125X145-50 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136 N of push force at 0.5 MPa and features a 145 mm nominal stroke that can be fine-tuned down by up to 50 mm, creating a precise 95-145 mm usable travel window. This built-in adjustability allows you to dial in the retract end-position during commissioning without adding external stops.
This large-bore actuator runs at 30-500 mm/s and uses a G1/2 port with a 32 mm carbon steel rod and M27x2 thread to handle substantial side loads. It shares the standard extruded aluminum barrel with dual sensor grooves but utilizes a reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR brackets. The rear screw acts purely as a travel stop for deceleration, not as a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 145 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 SAIJ125X145-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×145 | 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 SAIJ125X145-50 Is Used
Product Size Changeovers
Quickly modify the 95-145 mm travel endpoint during format changeovers on packaging lines, using the rear adjuster to accommodate varying carton or pallet dimensions without changing the cylinder.
Heavy Fixture Positioning
Leverage the 6136 N push force to move heavy machining fixtures into place, using the fine-tune stop to set exact clamping reach against the workpiece.
Commissioning Calibration
Dial in the exact retract position during initial machine setup, absorbing mechanical tolerances by trimming the stroke up to 50 mm rather than adding bulky external spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50 the Right Cylinder?
Select this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the thrust for heavy positioning tasks, but a 160 mm bore is physically oversized. The 50 mm adjustment range is ideal for production lines requiring frequent product-size changeovers, allowing operators to set variable end-stops on the fly rather than swapping out a fixed-stroke SAI cylinder. Because the stroke is 145 mm, standard external guiding is recommended to protect the rod seal from excessive side-loading.
To match this ISO 15552 dimensionally interchangeable cylinder, confirm the 145 mm stroke, 50 mm adjustment, PT tapered port thread, and the required mounting bracket. Since no magnet is specified, position sensing via CMSE or DMSE switches is not enabled. If the application requires the load to be held without live air pressure, the rear stopper here is insufficient; you must integrate an external pilot-operated check valve or switch to an AirTAC SAIL or BSAI locking cylinder.
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 SAIJ125X145-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At a maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the 145 mm nominal stroke by up to 50 mm, providing an effective travel window of 95 to 145 mm. This stopper only sets the end position and deceleration; it does not lock the load without continuous air pressure.
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