Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-40 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 SAIJ125AX240-40
The AirTAC SAIJ125X240-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a substantial 8590N push force at 0.7 MPa, utilizing a 32mm rod and PT tapered port threads. By turning the external rear stopper screw, you can fine-tune the effective travel down from the 240mm nominal stroke, creating a precise 200 to 240mm usable window. This allows exact end-position calibration during commissioning without adding external stops.
This model features a SUS420J2 stainless steel rod (material code A) for enhanced durability against moisture and minor corrosion. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept AirTAC CMSE reed or DMSE electronic solid-state switches if a magnet is specified later. It uses the standard SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting the FB, CA, CB, and CR options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-40 |
|---|---|
| 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 SAIJ125AX240-40
| 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 SAIJ125AX240-40 Is Used
Machine Changeover Setup
Quickly adjust the retract end-position by up to 40mm when switching product sizes on a packaging line, avoiding complete cylinder replacement.
Pressing Force Calibration
Dial in the exact 200 to 240mm travel window during commissioning to ensure the 6136N thrust at 0.5 MPa is applied at the precise mechanical depth required.
Heavy Material Handling
Lift and shift heavy workpieces using the 8590N push force at 0.7 MPa, relying on the robust SUS420J2 stainless steel rod for durability.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-40 the Right Cylinder?
Selecting this 125mm bore over a 100mm version steps the 0.5 MPa push force up from 3927N to 6136N, providing the necessary thrust for heavier actuators. The 40mm adjustment range is ideal for product changeovers on a line, letting you dial in a new retract distance rapidly. Because the rear adjuster acts purely as a travel stop and the air cushions handle deceleration, neither will hold a load without live air pressure. For true load-holding requirements, consider the SAIL or BSAI series.
When matching this ISO 15552 cylinder for a retrofit, verify the 240mm stroke, 40mm adjustment, PT G1/2 port, and the required mounting bracket. With a 240mm stroke, the 32mm rod diameter handles high side loads well, but any long unsupported travel still necessitates an external guide rail 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 SAIJ125AX240-40 FAQ
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 240mm nominal stroke by up to 40mm. This creates a 200 to 240mm usable travel window for fine-tuning end positions without swapping the cylinder.
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