Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-50 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 SAIJ125X270-50
The AirTAC SAIJ125X270-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 220 to 270 mm. Delivering 6136 N of push force at 0.5 MPa, it handles heavy actuation tasks while providing precise end-position tuning without swapping out the hardware. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE solid-state switches.
This model features a carbon steel piston rod with an M27x2 thread and a PT tapered port. The rear adjuster functions strictly as a mechanical stop to set the retraction end-point during commissioning or product changeovers. It is not a locking device, meaning the cylinder cannot hold a load without live air pressure. For applications requiring true fail-safe load holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-50 |
|---|---|
| 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 SAIJ125X270-50
| 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 SAIJ125X270-50 Is Used
Machine Changeover
Dial in the 220-270 mm travel window during product format changes to set new retract positions without machining new stop blocks.
Heavy Assembly Press
Provides 6136 N of push force at 0.5 MPa for heavy-duty joining operations, with the rear screw allowing precise final height calibration.
Variable End-Stop Tooling
Ideal for multi-product lines where the exact retraction end-point must be adjusted on the fly to accommodate different workpiece lengths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-50 the Right Cylinder?
Select this 125 mm bore actuator when your machinery requires high thrust (6136 N at 0.5 MPa) alongside variable end-stops for format changes. If you need less force and want a smaller footprint, a 100 mm bore provides 3927 N. Because the 270 mm stroke exceeds the 300 mm threshold, an external guide is recommended to prevent side-load damage to the M27x2 rod. This SAIJ variant uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 270 mm stroke, 50 mm adjustment range, PT port thread, and standard carbon steel rod. Choose this adjustable model over a fixed-stroke SAI cylinder when your setup requires iterative tuning of the retract position rather than a fixed travel distance.
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 SAIJ125X270-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure.
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke by up to 50 mm. This creates a usable travel window of 220 to 270 mm for fine-tuning the end position without replacing the cylinder.
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