Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-10S
The AirTAC SAIJ125X270-10-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster, delivering 6136N of push force at 0.5MPa. It provides a usable travel window of 260 to 270mm, allowing precise end-position tuning during commissioning. The extruded aluminum barrel includes sensor grooves on both sides, and the -S magnet integrates seamlessly with AirTAC CMSE reed and DMSE electronic switches for exact position feedback.
This 125mm bore model uses a PT tapered G1/2 port and a robust 32mm carbon steel rod with an M27x2 thread, handling high side loads effectively. The rear adjustment screw acts purely as a mechanical stop to set the retract distance, meaning it cannot hold the load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAIJ125X270-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125X270-10S Is Used
Machine Changeover
Dial in the exact 260-270mm retract distance during product size changes without swapping cylinders or adding external stopper blocks.
End-Position Tuning
Fine-tune the final end-stop at commissioning to absorb mechanical tolerances, ensuring perfect alignment before securing the tooling.
Heavy Payload Handling
Move substantial fixtures using 6136N of thrust at 0.5MPa, relying on the rigid 32mm rod to maintain stability under dynamic loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-10S the Right Cylinder?
Choose this adjustable-stroke model when your application requires variable end-stops or frequent machine changeovers, avoiding the need to physically swap out a fixed-stroke SAI cylinder. If your setup demands less force, stepping down to a 100mm bore yields 3927N at 0.5MPa, while upgrading to a 160mm bore provides 10053N for heavier payloads. Operating speed spans 30-500mm/s for this large bore class.
For a direct ISO 15552 replacement, match the 125mm bore, 270mm stroke, 10mm adjustment, PT port, and -S magnet. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 270mm stroke is substantial, ensure external guides support the load to prevent rod binding. If you need true load-holding without air pressure, select the SAIL or BSAI series instead, as this adjuster is not a lock.
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 SAIJ125X270-10S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 1251kgf at 1.0MPa.
The rear adjuster screw lets you shorten the nominal 270mm stroke by up to 10mm, creating a 260-270mm usable travel window. It functions strictly as a mechanical stop to tune the end position and does not lock or hold the load without live air pressure.
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