Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-50 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 SAIJ125X550-50
The AirTAC SAIJ125X550-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 500-550 mm, letting you dial back the nominal 550 mm stroke by up to 50 mm during commissioning without adding external stops. Built with an extruded aluminum barrel, it delivers a robust 6133 N pull force at 0.5 MPa, matching the standard SAI output.
This model uses a 32 mm carbon steel piston rod with an M27x2 thread, paired with 40 mm air cushions at both ends to handle heavy kinetic energy. The rear adjuster acts purely as a travel stop to fine-tune the end position; it does not hold the load without live air pressure. For position holding, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-50 |
|---|---|
| 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 SAIJ125X550-50
| 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 SAIJ125X550-50 Is Used
Variable End Stops
Dial in the exact 500-550 mm end position during machine setup to accommodate varying product lengths without changing cylinders.
Product Changeover
Quickly adjust the retract stop on packaging lines when switching between different package sizes, minimizing downtime.
Heavy Assembly Press
Leverage the 6136 N push force at 0.5 MPa for heavy-duty assembly tasks while fine-tuning the final stroke distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-50 the Right Cylinder?
Choose this 125 mm bore when you need heavy thrust between the 80 mm class (2513 N push at 0.5 MPa) and the 160 mm class (10053 N push at 0.5 MPa). The adjustable stroke is ideal for product changeovers on a line, allowing you to reposition the end-of-stroke stop quickly rather than swapping the entire cylinder for a fixed-stroke SAI unit. As an ISO 15552 cylinder, it is dimensionally interchangeable with standard ISO 15552 mounting interfaces.
When replacing a cylinder, match the 125 mm bore, 550 mm stroke, 50 mm adjustment range, PT G1/2 port, and mounting style. The mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 550 mm stroke is long, the heavy rod handles side loads well, but an external guide is still recommended for unsupported loads. Speeds range from 30-500 mm/s.
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 SAIJ125X550-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you shorten the effective travel from the nominal 550 mm down to 500 mm, creating a 500-550 mm usable window. It functions as a mechanical stop, not a lock, so it cannot hold the load without live air pressure.
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