Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-10 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 SAIJ125X550-10
The AirTAC SAIJ125X550-10 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 550 mm stroke that can be fine-tuned down by up to 10 mm, creating a precise 540-550 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning with ease.
This extruded aluminum barrel design incorporates variable air cushions at both ends and dual sensor grooves. The standard carbon steel rod features an M27x2 thread, and pneumatic connections use a PT tapered G1/2 port. The rear adjuster acts purely as a mechanical stop for end-position tuning and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-10 |
|---|---|
| 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 SAIJ125X550-10
| 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 SAIJ125X550-10 Is Used
Product Changeover
Quickly dial the retraction end-stop by up to 10 mm when switching between product sizes on a heavy-duty packaging line.
Machine Setup
Fine-tune the 540-550 mm travel window during commissioning to achieve exact tooling alignment without machining custom spacers.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or chassis components, relying on the rear stop for precise positioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-10 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust—stepping down to an 80 mm bore drops the 0.5 MPa push force to 2513 N, while this model provides 6136 N. The 10 mm adjustment range is ideal for dialing in exact retraction distances during machine commissioning or product changeovers without adding external stops. For load-holding without continuous air pressure, consider an AirTAC SAIL or BSAI cylinder instead of relying on the adjuster.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 550 mm stroke, 10 mm adjustment, PT G1/2 port, and mounting style. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options. Because the 550 mm stroke is lengthy, the M27x2 rod will carry significant side loads; always use an external guide to prevent rod binding.
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 SAIJ125X550-10 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 allows you to shorten the effective stroke by up to 10 mm, providing a usable travel window of 540-550 mm. It functions as a mechanical stop for end-position tuning and is not a locking device.
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