Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-30S
The AirTAC SAIJ125X240-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 210 to 240 mm. Featuring a 125 mm bore, it generates 6136 N of push thrust and 5734 N of pull thrust at 0.5 MPa. The carbon steel rod and M27x2 rod thread provide a robust interface for high-force operations, while the integrated -S magnet supports position sensing via CMSE reed or DMSE solid-state switches.
This adjustable-stroke design allows precise end-position tuning during commissioning or product changeover without swapping the cylinder or adding external stops. It includes variable air cushions at both ends and uses PT tapered port threads. The extruded aluminum barrel features sensor grooves on both sides, and the rear adjuster acts purely as a travel stop, meaning it cannot hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAIJ125X240-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SAIJ125X240-30S Is Used
Variable End-Stop Configuration
Dial in the 210-240 mm travel window during machine commissioning to perfectly seat heavy workpieces without physically remounting the actuator.
Product Line Changeover
Quickly shorten the stroke by up to 30 mm to accommodate different product sizes on a high-force assembly line.
Heavy Clamping Operations
Leverage the 6136 N push force at 0.5 MPa to secure large components, using the rear stop to fine-tune the final clamp position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-30S the Right Cylinder?
Choose this 125 mm bore when your application requires 6136 N of push force at 0.5 MPa, stepping up from a 100 mm bore that provides 3927 N. The 30 mm adjustment window is ideal for machinery requiring variable end-stops during product size changeovers. If your setup needs to hold a load without continuous air pressure, this cylinder is not suitable; the rear adjuster is a stop, not a lock, so you should explore the SAIL or BSAI series instead.
For ISO 15552 replacement, match the 125 mm bore, 240 mm nominal stroke, 30 mm adjustment range, PT port threads, and the -S magnet option. Mounting is limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2. Although 240 mm is under the 300 mm side-load threshold, the substantial M27x2 rod still requires good alignment to prevent premature seal wear.
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 SAIJ125X240-30S 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 the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw lets you shorten the effective travel from the 240 mm nominal stroke down to 210 mm. This mechanism acts as a travel stop and does not lock or hold the load without live air pressure.
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