Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-50S 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 SAIJ125X270-50S
The AirTAC SAIJ125X270-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 220 to 270 mm. It delivers a robust 6136 N push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks. The integrated magnet (-S) supports CMSE reed and DMSE electronic sensors, which mount cleanly into the dual-side sensor grooves on the extruded aluminum barrel.
This adjustable-stroke design allows you to fine-tune the retract end-position during commissioning or product changeovers without swapping the cylinder or adding external stops. The rear adjuster acts purely as a travel stop for end-position tuning and does not hold the load without live air pressure. For applications requiring true load-holding, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-50S |
|---|---|
| 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 SAIJ125X270-50S
| 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 SAIJ125X270-50S Is Used
Variable End-Stop Forming
Dial in the exact retract distance from 220 to 270 mm during machine setup to accommodate different material thicknesses without changing hardware.
Product Changeover Systems
Quickly reposition the rear stopper on a packaging line to handle varying box sizes, reducing downtime between production runs.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move substantial jigs or fixtures into place, tuning the final resting point on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-50S the Right Cylinder?
Select this 125 mm bore model when your application requires the 6136 N push force at 0.5 MPa and demands a variable end-stop within a 220 to 270 mm window. If your process needs less force, stepping down to an 80 mm bore yields 2513 N, whereas moving up to a 160 mm bore provides 10053 N. The PT tapered port and G1/2 thread interface are standard for this bore size.
Because the 270 mm stroke exceeds 300 mm? No, but even at 270 mm with a 32 mm rod and M27x2 thread, long unsupported strokes can induce side-loading; an external guide is recommended for optimal cylinder longevity. This SAIJ model supports the Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounting interfaces, omitting FB, CA, CB, and CR options. It is dimensionally interchangeable per ISO 15552.
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 SAIJ125X270-50S 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 stroke by up to 50 mm, creating a usable travel window of 220 to 270 mm. It functions as a mechanical stop for end-position tuning and is not a locking device.
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