Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-30
The AirTAC SAIJ125X550-30 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical adjuster that trims the effective stroke, creating a 520-550mm usable travel window for exact end-position tuning. Built with an extruded aluminum barrel, it delivers 6136N of push force at 0.5MPa and reaches a maximum of 1251kgf at 1.0MPa.
This SKU features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and uses PT tapered port threads. The G1/2 port and 32mm rod diameter manage high pneumatic flows, while the 40mm cushion stroke effectively decelerates heavy loads at both ends.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125AX550-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125AX550-30 Is Used
Variable End-Stop Tuning
Dial in the exact 520-550mm retraction point during machine commissioning to accommodate varying product lengths without adding external hard stops.
Heavy Load Positioning
Leverage the 1251kgf maximum thrust to move heavy jigs or assemblies into place, relying on the 40mm cushion stroke for smooth deceleration.
Product Size Changeover
Quickly adjust the rear screw up to 30mm to adapt automated lines for new part dimensions, reducing downtime between production runs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-30 the Right Cylinder?
Select this 125mm bore when an application requires substantial thrust, such as 6136N push at 0.5MPa, but still needs on-the-fly stroke trimming without swapping cylinders. If a setup demands less force, stepping down to a 100mm bore yields 3927N push at 0.5MPa; conversely, moving up to a 160mm bore provides 10053N. Because the 550mm stroke is long, an external guide is strongly recommended to prevent excessive side-loading on the rod.
The rear adjuster acts purely as a travel stop to fine-tune the 520-550mm window during product changeovers; it does not hold the load without live air. For true load-holding, an external rod lock or a SAIL pneumatic lock cylinder is required. This model is dimensionally interchangeable per ISO 15552 and uses the SAIJ mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX550-30 FAQ
At 0.5MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At its maximum operating pressure of 1.0MPa, it delivers up to 1251kgf of push force.
The rear adjuster screw acts as a mechanical stop that shortens the 550mm nominal stroke by up to 30mm, giving a usable travel window of 520-550mm. It sets the end position but does not lock the load without continuous air pressure.
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