Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-20S 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 SAIJ125X240-20S
The AirTAC SAIJ125X240-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 220 to 240 mm. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks. The extruded aluminum barrel features sensor grooves on both sides, and this -S variant includes a magnet for direct compatibility with AirTAC CMSE reed and DMSE electronic solid-state switches.
This model utilizes a carbon steel piston rod with an M27x2 thread and a G1/2 port. The rear adjuster functions strictly as a mechanical stop to fine-tune the retract end position during commissioning; it is not a locking device and will not hold a load without continuous live air. For load-holding requirements without pneumatic pressure, an external rod lock or a related AirTAC type like SAIL or BSAI is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-20S |
|---|---|
| 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 SAIJ125X240-20S
| 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 SAIJ125X240-20S Is Used
Product Changeover
Dial in the 220-240 mm travel window during line changeovers to accommodate different product sizes without swapping the actuator.
Heavy Press Fitting
Leverage the 6136 N push force at 0.5 MPa to seat large components, using the rear stop to prevent over-travel.
Machine Setup
Fine-tune the retract end position at commissioning to align heavy tooling precisely, avoiding the need for external stopper blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-20S the Right Cylinder?
Selecting this 125 mm bore cylinder is appropriate when an application demands high thrust (6136 N push at 0.5 MPa) alongside precise end-position tuning. If the force requirement is lower, stepping down to an 80 mm bore yields 2513 N of push force, whereas moving up to a 160 mm bore provides 10053 N. The adjustable 220-240 mm travel window is chosen over a fixed-stroke SAI cylinder when a machine must accommodate slight dimensional variances or product changeovers without adding external stops.
Because this is a 240 mm stroke, ensure the M27x2 rod is adequately supported to prevent excessive side-loading, utilizing an external guide if necessary. To achieve a true ISO 15552 replacement match, verify the 125 mm bore, 240 mm nominal stroke, 20 mm adjustment range, PT tapered port thread, and the -S magnet option. Mounting is limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
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 SAIJ125X240-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At the maximum rated pressure of 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke by up to 20 mm, creating a usable travel window of 220 to 240 mm. It only sets the end position and does not lock or hold the load without live air pressure.
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