Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-100 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 SAIJ125X550-100
The AirTAC SAIJ125X550-100 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 550 mm stroke that can be dialed back by up to 100 mm, creating a precise 450-550 mm usable travel window for commissioning flexibility. Belonging to the 125 mm bore class, it delivers a robust 8590 N of thrust at 0.7 MPa, making it well-suited for heavy-duty positioning tasks.
This model features a 32 mm carbon steel rod and a PT tapered G1/2 port. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches, though no magnet is included in this configuration. The rear adjuster acts solely as a travel stop to fine-tune end positions without adding external stops, while the variable air cushions manage deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-100 |
|---|---|
| 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 SAIJ125X550-100
| 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 SAIJ125X550-100 Is Used
Variable End-Stop Positioning
Dial in the exact 450-550 mm travel distance during machine commissioning to accommodate varying workpiece lengths without external mechanical stops.
Automated Product Changeover
Rapidly adjust the retract end-position on packaging or handling lines when switching to a different product size, minimizing downtime between production runs.
Heavy-Duty Assembly Presses
Leverage the 8590 N of available thrust at 0.7 MPa to securely seat or press components, using the rear screw to fine-tune the final contact depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-100 the Right Cylinder?
Choose this adjustable-stroke variant when your machine setup requires variable end-stops or frequent product changeovers that would otherwise demand physically swapping out a fixed-stroke SAIJ cylinder. If your application requires less force, stepping down to a 100 mm bore yields 5497 N at 0.7 MPa, whereas moving up to a 160 mm bore provides 14074 N for heavier loads.
Because the 550 mm stroke is relatively long, the 32 mm rod will experience greater leverage under side-loading, so an external guide rail is recommended to prevent premature seal wear. Remember that the rear adjuster and air cushions only set the travel end; they do not hold the load without live air. For position holding without continuous pressure, consider an AirTAC SAIL or BSAI cylinder. This model is dimensionally interchangeable per ISO 15552 and uses the reduced SAIJ mounting set: 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 SAIJ125X550-100 FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore double-acting cylinder generates 8590 N of push thrust and 5734 N of pull thrust.
The rear adjuster screw allows you to mechanically shorten the 550 mm nominal stroke by up to 100 mm, providing a usable travel window between 450 mm and 550 mm to fine-tune the end position.
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