Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-30
The AirTAC SAIJ125X325-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers substantial thrust, pushing with 8590N and pulling with 5734N at 0.7 MPa. By turning the external stopper screw, you can trim the effective travel back by up to 30 mm, creating a precise 295-325 mm usable window. This allows you to dial in the retract end-position at commissioning without adding external stops.
Built with an extruded aluminum barrel housing dual-side sensor grooves, it operates at speeds of 30-500 mm/s and uses a PT tapered G1/2 port. The 32 mm carbon steel rod and M27x2 thread provide robust resistance to side loads, though an external guide is still recommended for this 325 mm stroke. The standard variable air cushions at both ends manage end-of-travel deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAIJ125X325-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAIJ125X325-30 Is Used
Machine Changeover
Dial in the 295-325 mm retract position during product size transitions without swapping out the cylinder or repositioning hard stops.
End-Stop Tuning
Fine-tune the final resting position of heavy actuators at commissioning to achieve precise mechanical alignment using the 30 mm adjustment range.
Heavy Fixture Positioning
Leverage the 8590N push force to move substantial machining fixtures, relying on the integrated air cushions to soften the end-of-stroke impact.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-30 the Right Cylinder?
Choose this 125 mm bore when 100 mm falls short, as stepping up from the 100 mm bore (5497N push at 0.7 MPa) to this size yields 8590N for heavier fixtures. The adjustable 295-325 mm window is selected over a fixed-stroke SAI when a machine handles multiple product sizes and requires rapid, tool-less end-stop changes during line changeovers.
For a drop-in ISO 15552 replacement, match the 125 mm bore, 325 mm stroke, PT port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster is strictly a travel stop, not a lock; the cylinder will not hold a load without live air. For true fail-safe load holding, use an external rod lock or pilot-operated check valve, or explore the SAIL or BSAI series.
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 SAIJ125X325-30 FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides a push force of 8590N and a pull force of 5734N. At 0.5 MPa, it delivers 6136N push and 5734N pull.
The rear adjuster acts as an external stopper screw that lets you shorten the 325 mm nominal stroke by up to 30 mm, providing a usable travel window of 295 to 325 mm. It sets the end position but does not lock the load without live air pressure.
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