Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50
The AirTAC SAIJ125X155-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a carbon steel piston rod and PT tapered port threads. By integrating an external stopper at the rear, this actuator allows you to fine-tune the end position during commissioning without swapping out the entire cylinder.
With a 155mm nominal stroke and a 50mm adjustment range, the usable travel window spans 105 to 155mm. This built-in flexibility is ideal for production lines running multiple product sizes. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to easily add CMSE reed or DMSE electronic switches if position feedback is later required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125X155-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125X155-50 Is Used
Product Size Changeovers
Dial in the 105-155mm travel window during format changes to accommodate varying package dimensions without re-mounting hardware.
Commissioning Calibration
Fine-tune the retract end position precisely during machine setup to perfect alignment without adding external mechanical stops.
Heavy Forming Operations
Leverage the 6136N push force at 0.5 MPa for pressing or holding heavy components, adjusting the stroke to match different material thicknesses.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50 the Right Cylinder?
Select this 125mm bore when an application requires substantial thrust—such as 6136N push or 5734N pull at 0.5 MPa—surpassing the 3927N push capacity of a 100mm bore. The adjustable 105 to 155mm travel window is chosen over a fixed-stroke SAI cylinder when machinery requires frequent product changeovers or precise end-position tuning. It utilizes a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets.
Because the stroke is 155mm, the 32mm rod diameter handles high side loads well, though external guides are recommended for heavy off-center loads. Note that the rear adjuster functions strictly as a travel stop and does not hold the load without live air; for fail-safe load holding, consider the SAIL or BSAI series. Operating speed is rated at 30-500mm/s.
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 SAIJ125X155-50 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum pressure of 1.0 MPa, it achieves a push force of 1251 kgf.
The rear adjuster acts as a mechanical stop that trims the effective travel. For this 155mm nominal stroke cylinder, the 50mm adjustment creates a usable travel window of 105 to 155mm, allowing you to shorten the stroke as needed without replacing the actuator.
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