Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-75S 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 SAIJ125X275-75S
The AirTAC SAIJ125X275-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks. The extruded aluminum barrel features sensor grooves on both sides, and the integrated magnet (-S) directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for precise end-position detection.
This specific SKU features a 275mm nominal stroke that can be dialed back by up to 75mm, creating a highly versatile 200-275mm usable travel window. This wide adjustment range allows you to fine-tune the retract end-position during commissioning or product changeover without physically swapping the cylinder or adding external mechanical stops. The standard carbon steel rod and M27x2 rod thread provide substantial structural rigidity for high-load handling.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-75S |
|---|---|
| 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 SAIJ125X275-75S
| 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 SAIJ125X275-75S Is Used
Variable End-Stop Tuning
Dial in the retract stroke from 200 to 275mm during machine commissioning to achieve exact positioning without machining new spacer blocks.
Product Changeover Systems
Quickly adapt the cylinder's effective travel window on automated lines when switching to a different product size or format.
Heavy-Duty Clamping
Leverage the 6136N push force at 0.5 MPa to securely clamp large workpieces while making fine adjustments to the clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-75S the Right Cylinder?
Choose this 125mm bore adjustable-stroke cylinder when your application requires variable end-stops within a 200-275mm travel window. If your process needs less force, stepping down to a 100mm bore yields 3927N of push force at 0.5 MPa, whereas moving up to a 160mm bore provides 10053N for heavier loads. Because the 275mm stroke approaches the mid-range of the 125mm bore's 1500mm maximum, it is less prone to rod sag than longer strokes, though an external guide is still recommended for heavy offset loads.
The rear adjuster acts purely as a travel stop and works alongside the 40mm variable air cushions to decelerate the load; it does not hold the load without live air pressure. For fail-safe load holding, consider the SAIL or BSAI series instead. To achieve a true ISO 15552 replacement match, ensure you specify the 125mm bore, 275mm stroke, 75mm adjustment, PT tapered port thread, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets.
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 SAIJ125X275-75S FAQ
The rear adjusting screw acts as a mechanical stopper that lets you shorten the effective stroke by up to 75mm. This provides a usable travel window of 200-275mm, allowing you to fine-tune the end position at commissioning without replacing the cylinder.
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. The maximum operating speed is 30-500 mm/s, and it operates reliably with filtered air at pressures up to 1.0 MPa.
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