Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-50S
The AirTAC SAIJ125X85-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 50 mm. This creates a usable stroke window ranging from 35 mm to 85 mm, providing exact end-position tuning at commissioning without needing to swap out the entire actuator or bolt on external stops. In this configuration, the unit delivers a robust 6136 N pull force at 0.5 MPa.
This specific SKU is built with a SUS420J2 stainless steel rod for superior corrosion resistance and includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE solid-state sensors. It utilizes PT tapered ports and relies on variable air cushions at both ends to decelerate the load. The rear adjuster functions strictly as a mechanical travel stop, meaning it cannot hold the load safely without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAIJ125AX85-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAIJ125AX85-50S Is Used
Variable End-Stop Forming
Dial in the exact 35 to 85 mm stroke window during press setup to accommodate different material thicknesses without changing out tooling.
Product Changeover Diverter
Quickly adjust the retract stop position on a packaging line to handle varying package lengths on the fly during product transitions.
Heavy-Duty Clamp Tuning
Fine-tune the clamping end-position during machine commissioning to ensure optimal contact force without over-traveling the fixture.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-50S the Right Cylinder?
Selecting this 125 mm bore actuator makes sense when your application requires the high thrust capacity of a large cylinder but demands on-the-fly end-position adjustments to accommodate varying product sizes. If your setup only needs a fixed 85 mm stroke without the 50 mm trim window, the standard SAI fixed-stroke cylinder is a simpler alternative. For load-holding requirements without continuous air pressure, this adjustable stopper is insufficient; you should evaluate the SAIL pneumatic lock or BSAI clamp-lock series instead.
Because this is a large-bore cylinder moving substantial mass, ensure your mounting arrangement—chosen from the SAIJ subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2—properly supports the load. The 32 mm rod and M27x2 thread provide high rigidity, but any long or heavy unsupported tooling should still be guided externally to prevent excessive side-loading on the barrel.
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 SAIJ125AX85-50S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force due to the single-rod design. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster acts as a mechanical stop that allows you to shorten the nominal 85 mm stroke by up to 50 mm, creating a usable travel window of 35 to 85 mm. This allows for precise end-position tuning at commissioning, but it does not lock the load without live air pressure.
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