Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-30S
The AirTAC SAIJ125X45-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing 6136N of push force at 0.5 MPa. It features a 45 mm nominal stroke that can be dialed back by up to 30 mm, yielding a usable travel window of 15-45 mm for precise end-position tuning. The included magnet (-S) supports position detection with AirTAC CMSE reed and DMSE electronic sensors.
This unit uses a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance compared to standard carbon steel. It operates at speeds of 30-500 mm/s and uses PT tapered port threads. The rear adjustment mechanism acts purely as a travel stop to decelerate the load, meaning it will not hold a position without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 45 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 SAIJ125AX45-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×45 | 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 SAIJ125AX45-30S Is Used
Product Changeovers
Fine-tune the 15-45 mm stroke window on the fly to accommodate varying package sizes on a packaging line without changing the cylinder.
Machine Setup
Dial in the exact end-stop position during commissioning to prevent crashes and ensure precise mechanical alignment.
Variable End Stops
Use the rear adjuster to set different retraction depths for multi-tier assembly processes on the same fixture.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-30S the Right Cylinder?
Selecting this 125 mm bore makes sense when your application requires substantial force, as stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927N. The adjustable 15-45 mm travel window is ideal for product changeovers where the exact end-of-stroke position varies slightly, saving you from physically swapping cylinders or adding external stoppers. For load-holding without continuous air pressure, you would need an external rod lock or a different cylinder series like SAIL or BSAI, as the SAIJ adjuster is strictly a stop. When replacing an ISO 15552 cylinder, match the 125 mm bore, 45 mm stroke, 30 mm adjustment, PT port, and -S magnet options.
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 SAIJ125AX45-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum pressure of 1.0 MPa, it delivers 1251 kgf.
The rear adjuster screw lets you shorten the 45 mm nominal stroke by up to 30 mm, creating a usable travel window of 15-45 mm. It functions as an external stop to tune the end position, but it is not a lock and cannot hold the load without live air pressure.
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