Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-40
The AirTAC SAIJ125X250-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 210 to 250 mm, allowing you to dial back the 250 mm nominal stroke by up to 40 mm during commissioning. The 32 mm piston rod utilizes a robust M27x2 thread, and the PT tapered port connection ensures a positive seal.
This model delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa operating pressure. The rod is constructed from SUS420J2 stainless steel (material code A) for enhanced corrosion resistance, and the extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125AX250-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125AX250-40 Is Used
Machine Changeover
Fine-tune the 210-250 mm travel window during product size changes without physically swapping the cylinder or repositioning hard stops.
End-Position Tuning
Dial in the exact retract distance at commissioning using the rear screw stopper, compensating for mechanical tolerance stack-up.
Heavy-Duty Positioning
Leverage 6136 N of push force to move heavy jigs or fixtures into exact working positions on automated assembly lines.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-40 the Right Cylinder?
Choose this 125 mm bore when 8590 N of thrust at 0.7 MPa is required, or step down to an 80 mm bore providing 2513 N at 0.5 MPa for lighter loads. The adjustable stroke is ideal for product changeovers, letting you fine-tune the end position without swapping cylinders or adding external stops. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 250 mm stroke is under the 300 mm side-load threshold, a separate external guide is not strictly mandated, but the rear adjuster acts only as a travel stop. For load-holding without live air pressure, select an external rod lock, a pilot-operated check valve, or the AirTAC SAIL/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 SAIJ125AX250-40 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 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as a mechanical stop that shortens the 250 mm nominal stroke by up to 40 mm, creating a usable travel window of 210 to 250 mm. It only sets the travel end and does not lock or hold the load without live air pressure.
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