Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-50 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 SAIJ125AX125-50
The AirTAC SAIJ125X125-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 75 to 125 mm, allowing you to dial back the effective stroke by up to 50 mm during commissioning. This bore delivers 6136 N of push force at 0.5 MPa and utilizes a PT tapered port thread.
This specific configuration includes an SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance. It operates at speeds of 30-500 mm/s and includes variable air cushions at both ends to decelerate the load. The extruded aluminum barrel features dual sensor grooves, though this unit is supplied without a magnet.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-50 |
|---|---|
| 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 SAIJ125AX125-50
| 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 SAIJ125AX125-50 Is Used
Product Changeover
Dial in the 75-125 mm travel window on the fly to accommodate different package sizes on a packaging line without swapping hardware.
End-Position Tuning
Fine-tune the retract end-position precisely during machine setup, compensating for mechanical wear or sensor drift over time.
Heavy Forming Stops
Leverage the 6136 N push force at 0.5 MPa to drive heavy stamping or forming operations with an adjustable mechanical stopper.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-50 the Right Cylinder?
Select this 125 mm bore cylinder when a 100 mm bore (providing 3927 N push at 0.5 MPa) cannot meet your thrust requirements, but you want to avoid jumping to a 160 mm frame. Choose the SAIJ adjustable format over a fixed SAI when you need variable end-stops for product changeovers. Note that the rear adjuster acts only as a travel stop; it does not hold the load without live air. For load-holding without pressure, use an external rod lock or explore SAIL and BSAI variants. Mounting options include 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 SAIJ125AX125-50 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster acts as a mechanical stop that lets you shorten the nominal 125 mm stroke by up to 50 mm, creating a usable travel window of 75 to 125 mm. It is a travel stop, not a lock, and requires live air to hold the load.
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