Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75
The AirTAC SAIJ125X135-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 60 to 135 mm usable travel window. Delivering 6136 N of pull force at 0.5 MPa, it handles heavy positioning tasks with a robust 32 mm piston rod. The rod is constructed from SUS420J2 stainless steel, offering enhanced corrosion resistance compared to standard carbon steel options.
This model uses PT tapered port threads and includes adjustable air cushions at both ends to manage kinetic energy. The rear stopper mechanism allows operators to dial in the exact end position during commissioning without adding external stops. Remember that this adjuster acts purely as a travel stop and does not hold the load without continuous air pressure; for true locking, consider the SAIL or BSAI variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125AX135-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125AX135-75 Is Used
Variable End Stops
Ideal for packaging lines where the rear adjuster quickly shifts the 60-135 mm travel window to accommodate different carton sizes without swapping cylinders.
Machine Changeover
Enables rapid commissioning on heavy assembly presses by fine-tuning the retract end position to match new tooling dimensions on the fly.
Size Change Adjustments
Perfect for material handling systems that process varying product lengths, letting operators dial in the exact stroke limit during production transitions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75 the Right Cylinder?
Select this 125 mm bore when your application requires substantial thrust, such as 8590 N push at 0.7 MPa, but still needs the flexibility to trim up to 75 mm of stroke. If your force requirements are lower, stepping down to a 100 mm bore yields 3681 N pull at 0.5 MPa, whereas moving up to a 160 mm bore provides 9425 N pull for heavier loads.
Choose the adjustable SAIJ over a fixed SAI when you need precise end-position tuning during machine setup or product changeovers. This cylinder supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2. Since the usable stroke is 135 mm, you do not need external guides for side-load support, but always verify your speed stays within the 30-500 mm/s range for this bore size.
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 SAIJ125AX135-75 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 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw allows you to reduce the nominal 135 mm stroke by up to 75 mm, creating a usable travel window of 60 to 135 mm. This stopper only limits the travel end and does not lock the load without live air pressure.
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