Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-75 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 SAIJ125X125-75
The AirTAC SAIJ125X125-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N push force at 0.5MPa, making it well suited for heavy-duty positioning tasks. By integrating an extruded aluminum barrel with sensor grooves on both sides, this unit maintains a dimensionally interchangeable ISO 15552 mounting interface without relying on traditional tie-rod construction.
Equipped with a 75mm adjustment range, this specific SKU creates a 50-125mm usable travel window from its 125mm nominal stroke. This built-in stopper allows operators to fine-tune the retract end-position during commissioning or product changeovers without swapping the cylinder. The standard carbon steel rod and PT tapered port thread are paired with variable air cushions at both ends to manage kinetic energy, though the adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-75 |
|---|---|
| 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 SAIJ125X125-75
| 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 SAIJ125X125-75 Is Used
Variable End Stops
Ideal for machining fixtures requiring precise retract positions, allowing the 125mm stroke to be mechanically dialed back to a 50mm minimum travel point.
Product Changeover
Enables rapid line adjustments for different package sizes, using the 75mm rear adjuster to tune the cylinder reach without replacing hardware.
Heavy-Duty Positioning
Leverages the 6136N push force at 0.5MPa to move heavy pallets or workpieces, relying on standard variable air cushions to decelerate the load.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-75 the Right Cylinder?
Choose this 125mm bore when an application requires greater thrust than a 100mm cylinder, which provides 3927N of push force at 0.5MPa. The adjustable stroke is ideal for machinery that processes varying product sizes, allowing the end-stop to be dialed back by up to 75mm rather than fabricating external stops. If the setup requires the load to be held mechanically without continuous air pressure, a plain SAIJ is insufficient; operators should instead evaluate the SAIL pneumatic lock or BSAI clamp-lock series.
To achieve a true ISO 15552 replacement match, verify the 125mm bore, 125mm stroke, 75mm adjustment, PT port thread, and required mounting style. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR configurations. Because this model lacks the -S suffix, it does not include a magnet for AirTAC CMSE reed or DMSE electronic sensors.
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 SAIJ125X125-75 FAQ
At 0.5MPa operating pressure, the 125mm bore generates 6136N of push force and 5734N of pull force. If pressure is increased to 0.9MPa, the push force reaches 11045N.
The rear adjuster acts as a mechanical stop that shortens the effective travel. For this model, it creates a usable window of 50-125mm, but it only sets the end position and does not lock the load without live air.
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