Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50
The AirTAC SAIJ125X275-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. By turning the rear stopper screw, you can trim the effective travel anywhere within a 225-275mm window. This built-in adjustability allows precise end-position tuning during commissioning without swapping out the entire actuator or fabricating external stops.
It features a robust 32mm carbon steel rod and a PT tapered G1/2 port. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. The rear adjuster acts strictly as a travel stop to set the deceleration point alongside the air cushions, meaning it will not hold a load in place without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125X275-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125X275-50 Is Used
Product Changeovers
Dial in the 225-275mm travel window during format changes on packaging lines, using the rear screw to set new end positions without changing hardware.
Machine Setup
Fine-tune the final retract position during commissioning to achieve precise alignment, avoiding the need for external shims or stopper blocks.
Variable End Stops
Adapt clamping or pressing strokes on the fly for different part sizes, relying on the 6136N thrust to handle heavy-duty positioning tasks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50 the Right Cylinder?
Choose this 125mm bore when a 100mm bore (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore (10053N) would be physically oversized. The 50mm adjustment range is ideal for machinery that frequently handles product-size changeovers, allowing operators to dial in the exact end-stop on the fly instead of replacing a fixed-stroke SAI cylinder. To match this ISO 15552 footprint exactly, specify the 275mm stroke, 50mm adjustment, PT port, and your preferred mounting from the reduced SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
Because the 275mm stroke is moderately long, ensure adequate external guiding to prevent excessive side-loading on the 32mm rod. For applications requiring the load to be held mechanically without air pressure, a plain SAIJ is insufficient; consider the SAIL (air-released lock) or BSAI (clamp-lock) variants instead.
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 SAIJ125X275-50 FAQ
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the nominal 275mm stroke by up to 50mm. This creates a usable travel window of 225-275mm, which can be fine-tuned during machine setup or product changeovers without replacing the cylinder.
At a 0.5 MPa operating pressure, the SAIJ125X275-50 provides 6136N of push force and 5734N of pull force. It can deliver up to 8590N of push force at 0.7 MPa.
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