Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-40 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 SAIJ125X270-40
The AirTAC SAIJ125X270-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 230 to 270 mm, allowing you to dial in the exact retract position without adding external stops. In this 125 mm bore class, it delivers 6136 N of pull force at 0.5 MPa and reaches up to 8590 N at 0.7 MPa. The PT tapered port threads match the standard G1/2 fluid connection for this bore size.
This actuator uses a robust 32 mm carbon steel rod and M27x2 rod thread to handle high side loads, though the 270 mm travel still requires an external guide for optimal performance. The extruded aluminum barrel includes sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches. It supports a mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-40 |
|---|---|
| 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 SAIJ125X270-40
| 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 SAIJ125X270-40 Is Used
Product Changeover
Dial in the 230-270 mm travel window during packaging size transitions without physically replacing the actuator.
End-Stop Tuning
Fine-tune the retract position during machine commissioning to perfect pressing or clamping endpoints.
Heavy Forming
Leverage the 6136 N pull force for heavy-duty assembly tasks requiring variable positioning depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-40 the Right Cylinder?
Choose this 125 mm bore when your application requires heavy thrust beyond the 3927 N push force of a 100 mm cylinder at 0.5 MPa. The adjustable stroke is ideal for machine changeovers, letting you fine-tune the end position at commissioning rather than swapping a fixed-stroke SAI cylinder. The rear adjuster acts purely as a travel stop to decelerate the load; it does not hold position without live air. For load-holding without pressure, use a SAIL or BSAI cylinder.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 270 mm nominal stroke, 40 mm adjustment range, PT port threads, and the specific mounting interface. Because the stroke is 270 mm, always support the load with an external guide to prevent excessive rod side-load wear.
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 SAIJ125X270-40 FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 40 mm. This creates a usable travel window of 230 to 270 mm, allowing precise end-position tuning at commissioning without external stops.
At 0.5 MPa, it provides 6136 N of pull force and 8590 N at 0.7 MPa. The maximum push force is 11045 N at 0.9 MPa.
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Standard models usually ship in 3-4 days.
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