Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50S
The AirTAC SAIJ125X50-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5 MPa and uses a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance. Equipped with a magnet (-S), it integrates seamlessly with AirTAC CMSE reed and DMSE solid-state sensors via the dual-side sensor grooves on the extruded aluminum barrel.
This model provides a 0-50mm usable travel window from its 50mm nominal stroke, allowing precise end-position tuning at commissioning. The PT tapered port (G1/2) ensures a tight pneumatic connection. The rear adjuster acts as a mechanical stop to decelerate travel, but it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125AX50-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125AX50-50S Is Used
Machine Changeover
Dial in the 0-50mm travel window instantly during product-size changeovers on a packaging line, eliminating the need to swap cylinders or add external mechanical stops.
End-Position Tuning
Fine-tune the retract end-position during commissioning to hit exact mechanical datums, using the rear stopper to absorb the 6136N force without re-engineering the fixture.
Assembly Pressing
Apply up to 11045N of push force at 0.7 MPa for pressing operations, adjusting the stroke on the fly to accommodate varying part heights and material thicknesses.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50S the Right Cylinder?
Choose this 125mm bore cylinder when an application requires the 6136N push force at 0.5 MPa and the ability to dial in the exact end-stop on the fly. If you need less force, stepping down to a 100mm bore yields 3927N. The adjustable stroke is selected over a fixed SAI cylinder when machine setups require variable end positions or product-size changeovers without swapping hardware.
For load-holding without live air, note that this cylinder's rear adjuster is a travel stop, not a lock; you would need an SAIL or BSAI cylinder instead. As a true ISO 15552 profile cylinder, it is dimensionally interchangeable with standard ISO 15552 mounting interfaces and supports the Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounting set (omitting FB/CA/CB/CR).
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 SAIJ125AX50-50S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to trim the effective travel anywhere in a 0-50mm window from the nominal 50mm stroke. It acts as a mechanical stop to set the end position, but it does not lock or hold the load without continuous air pressure.
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