Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20S
The AirTAC SAIJ125X75-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 55 to 75 mm. Featuring a 125 mm bore, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa. The integrated magnet (-S) supports position sensing via AirTAC CMSE reed or DMSE electronic switches mounted in the dual-side sensor grooves.
This model features an SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and utilizes PT tapered port threads. The external rear stopper allows you to trim the stroke by up to 20 mm during commissioning without swapping the cylinder. It is a true extruded aluminum profile cylinder, dimensionally interchangeable per ISO 15552, and supports a speed range of 30-500 mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125AX75-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SAIJ125AX75-20S Is Used
Product Changeover
Dial in the 55-75 mm travel window during format size changes on a packaging line without replacing the cylinder.
End-Position Tuning
Fine-tune the retract end-stop during machine commissioning to perfect the pressing or lifting motion of the 125 mm bore.
Sensor-Driven Stops
Pair the rear adjuster with DMSE solid-state sensors in the dual grooves to confirm trimmed stroke positions in automated assemblies.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20S the Right Cylinder?
Select this 125 mm bore when an 80 mm cylinder (providing 2513 N push force at 0.5 MPa) is insufficient, but a 160 mm bore (10053 N at 0.5 MPa) would be excessive. The adjustable stroke is ideal for machine setups requiring variable end-stops or product-size changeovers, offering fine end-position tuning that avoids the cost and downtime of adding external mechanical stops or swapping a fixed-stroke SAI cylinder.
For any load-holding requirements, note that the rear adjuster acts only as a travel stop and the air cushions provide deceleration—neither holds the load without live air pressure. For secure positioning without continuous air, consider an external rod lock or AirTAC SAIL/BSAI series. To match this exact configuration, select a 125 mm bore, 75 mm stroke, 20 mm adjustment, PT G1/2 port, SUS420J2 (A) rod material, and the -S magnet option. Mounting options are limited to 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 SAIJ125AX75-20S 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 an external stopper that allows you to shorten the 75 mm nominal stroke by up to 20 mm, creating a usable travel window of 55 to 75 mm. It sets the travel end but does not lock or hold the load without live air pressure.
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