Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-75S
The AirTAC SAIJ125X125-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical stroke adjuster. It features a built-in magnet (-S) for position sensing and a carbon steel rod. By turning the rear stopper screw, you can trim the nominal 125 mm stroke back by up to 75 mm, creating a highly flexible 50-125 mm usable travel window for precise end-position tuning.
This 125 mm bore generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, placing it in a heavy-duty force class. The extruded aluminum barrel integrates sensor grooves on both sides, directly supporting AirTAC CMSE reed and DMSE electronic solid-state switches without requiring extra brackets. It uses PT tapered ports sized at G1/2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125X125-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125X125-75S Is Used
Variable End-Stop Positioning
Dial in the exact clamping end-position between 50 and 125 mm during machine setup without disassembling the pneumatic circuit.
Product Line Changeovers
Quickly adapt the cylinder travel to accommodate different sized products on the same conveyor by adjusting the rear stopper.
Heavy-Duty Pressing
Leverage 6136 N of thrust at 0.5 MPa for pressing operations while fine-tuning the final contact distance to prevent over-travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-75S the Right Cylinder?
Select this adjustable-stroke model when an application requires frequent end-stop modifications during commissioning or product changeovers, eliminating the need to physically swap out the cylinder or add external stops. If your process requires less force, stepping down to an 80 mm bore yields 2513 N of push at 0.5 MPa. For load-holding without continuous live air pressure, note that the rear adjuster acts only as a travel stop and not a lock; you must use an SAIL pneumatic lock, a BSAI clamp-lock, or an external rod lock. As a direct ISO 15552 dimensionally interchangeable replacement, match the 125 mm bore, 125 mm stroke, 75 mm adjustment, G1/2 PT ports, and the -S magnet. Mounting options are limited to the SAIJ subset: 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 SAIJ125X125-75S FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from its 125 mm nominal length by up to 75 mm. This provides a usable 50-125 mm stroke window for fine-tuning end positions at commissioning without changing the cylinder.
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver a maximum thrust of 1251 kgf at 1.0 MPa.
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