Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-100
The AirTAC SAIJ125X500-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 400-500 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning with precision. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
This model uses a SUS420J2 stainless steel rod for enhanced corrosion resistance and features PT tapered port threads. The rear stopper screw allows you to fine-tune the retract end position during commissioning without swapping out the entire cylinder. The adjuster acts only as a travel stop, not a load lock, so live air pressure must be maintained to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125AX500-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125AX500-100 Is Used
Multi-Product Forming
Dial in the exact 400-500 mm retract depth for different material blanks on the same press, using the rear adjuster to switch sizes in seconds.
Variable Diverters
Adjust the stroke end-point on packaging lines to accommodate various carton lengths without physically changing out the actuator.
Heavy Assembly Presses
Leverage the 6136 N push force to seat large components, fine-tuning the final end position during machine setup to prevent over-travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-100 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 3927 N push at 0.5 MPa) lacks the thrust for your application, but you want to avoid stepping up to a 160 mm bore. The 100 mm adjustment range is perfect for production lines running multiple product sizes, allowing rapid end-stop changes without external stopper blocks. To replace an ISO 15552 cylinder, match the 125 mm bore, 500 mm stroke, PT port threads, and mounting style.
Because this cylinder has a 500 mm stroke, the M27x2 piston rod is subject to increased side-loading forces. An external guide should be used to prevent rod binding over this long travel distance. For applications requiring the load to be held without continuous air pressure, a standard SAIJ is insufficient; consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
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 SAIJ125AX500-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective travel from the nominal 500 mm down to 400 mm. This creates a 400-500 mm usable window for fine-tuning the end position at commissioning, but it functions only as a stop and does not lock the load without air pressure.
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