Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 260mm 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
- Stroke260 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-75S
The AirTAC SAIJ125X260-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa, making it suited for heavy-duty positioning. The built-in -75 mm adjustment mechanism allows you to trim the effective travel down from the 260 mm nominal stroke, creating a precise 185 to 260 mm usable window. This enables exact end-position tuning at commissioning without swapping out the cylinder.
This model features a standard carbon steel piston rod and a PT tapered port thread. It includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors, which seat cleanly into the dual-side sensor grooves on the extruded aluminum barrel. The rear adjuster acts purely as a travel stop and works alongside the 40 mm variable air cushions at both ends to decelerate the load, but it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 260 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 SAIJ125X260-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×260 | 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 SAIJ125X260-75S Is Used
Product Size Changeover
Dial in the 185-260 mm travel window during format changes on packaging lines, accommodating different carton sizes without mechanical rebuilds.
Heavy Press Positioning
Leverage the 6136N push force to move heavy assemblies, using the rear stopper to fine-tune the exact pressing depth at commissioning.
Variable End-Stop Automation
Set precise retract positions for material ejection systems, relying on the 40 mm air cushions to decelerate loads smoothly at the end of travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-75S the Right Cylinder?
Selecting this adjustable-stroke cylinder over a fixed SAI model is ideal when your application requires variable end-stops or frequent product-size changeovers on the line. If you need slightly less thrust, stepping down to a 100 mm bore yields 3927N of push force at 0.5 MPa; stepping up to a 160 mm bore provides 10053N. Because the nominal stroke is 260 mm, you should support the load with an external guide to prevent excessive side-loading on the 32 mm rod.
For a true ISO 15552 replacement, match the 125 mm bore, 260 mm stroke, PT port thread, and -S magnet. The SAIJ series supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, but omits FB, CA, CB, and CR. Remember that a plain SAIJ does not hold its position without live air; for load-holding without pressure, consider an AirTAC SAIL pneumatic lock, BSAI clamp-lock, or an external rod lock.
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 SAIJ125X260-75S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it achieves a top push force of 11045N.
The rear adjuster screw lets you shorten the 260 mm nominal stroke by up to 75 mm, providing an effective travel window of 185 to 260 mm. This stopper sets the retract end position but does not lock the load without continuous air pressure.
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