Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-20S 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 SAIJ125X260-20S
The AirTAC SAIJ125X260-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 260mm nominal stroke that can be fine-tuned down by up to 20mm, creating a precise 240-260mm usable travel window. This built-in adjustability allows you to dial in exact retract end positions during commissioning without adding external stops.
This specific configuration includes a standard carbon steel piston rod, PT tapered port threads, and an integrated magnet for position sensing. The sensor groove on both sides of the extruded aluminum barrel accepts AirTAC CMSE reed or DMSE electronic solid-state switches. The rear adjustment screw functions strictly as a travel stop to set the end position, so it will not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-20S |
|---|---|
| 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 SAIJ125X260-20S
| 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 SAIJ125X260-20S Is Used
Product Changeover
Quickly fine-tune the 240-260mm retract end-stop when switching between product sizes on a packaging line, avoiding physical cylinder swaps.
Machine Setup
Dial in the exact end position during initial commissioning, using the rear screw to compensate for mechanical tolerances without external stoppers.
Heavy Forming
Leverage the 6136N push force at 0.5 MPa for pressing or heavy clamping tasks where the final stroke depth requires precise field adjustment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-20S the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder lacks thrust, as stepping up from the 100mm bore (3927N push at 0.5 MPa) to this model yields 6136N. Conversely, if your application only requires around 2500N, stepping down to an 80mm bore saves space and air consumption. The adjustable stroke is ideal for product-size changeovers on a line, letting you reposition the retract end-stop on the fly instead of swapping out a fixed-stroke SAI cylinder. For a true ISO 15552 replacement, match the 125mm bore, 260mm stroke, 20mm adjustment, PT ports, and the -S magnet requirement.
Because the 260mm stroke is substantial, the 32mm diameter carbon steel rod will carry significant side loads, but you should still use an external guide rail to prevent binding over long unsupported travel. If your setup needs to hold a load statically without continuous air pressure, this cylinder is not suitable; you should look at the SAIL pneumatic lock or BSAI clamp-lock series instead. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X260-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At its maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 260mm nominal stroke by up to 20mm, providing a usable travel window of 240-260mm. It only sets the end position and does not lock or hold the load without live air pressure.
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