Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75
The AirTAC SAIJ125X185-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 110-185 mm, allowing you to dial back the nominal 185 mm stroke by up to 75 mm during commissioning. Belonging to the 125 mm bore class, it delivers 6136 N of pull force at 0.5 MPa and 8590 N of push force at 0.7 MPa.
This variant features a SUS420J2 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though position detection requires adding a magnet. The rear adjuster acts purely as a travel stop to fine-tune end positions without adding external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125AX185-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125AX185-75 Is Used
Product Changeovers
Quickly reconfigure the 110-185 mm travel window to handle varying material lengths on a single production line without swapping hardware.
End-Position Tuning
Fine-tune the retract stop during machine commissioning to perfectly time heavy clamping actions using its 8590 N push force at 0.7 MPa.
Heavy Assembly Presses
Leverage the 125 mm bore power to drive large fixtures while retaining the flexibility to trim the stroke for different assembly depths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75 the Right Cylinder?
Select this 125 mm bore model when an application demands high thrust combined with variable end positioning, such as accommodating multiple product sizes on one line. If the 6136 N pull force at 0.5 MPa exceeds your requirement, stepping down to a 100 mm bore yields 3681 N pull. Because the 185 mm stroke is below the 300 mm threshold, side-load concerns are minimal, though the 32 mm rod diameter handles moderate side loads well.
Choose this adjustable-stroke version over a fixed SAI cylinder when you need to fine-tune the retract end position during setup or product changeovers. The rear adjuster is a stop, not a lock; it cannot hold a load without live air. For true position holding without pneumatic pressure, consider an AirTAC SAIL pneumatic lock, a BSAI clamp-lock cylinder, or an external pilot-operated check valve. This model is dimensionally interchangeable per ISO 15552 and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125AX185-75 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop that lets you shorten the 185 mm nominal stroke by up to 75 mm, creating a usable travel window of 110-185 mm. It only sets the end position and does not lock the load without live air pressure.
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