Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-50 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 SAIJ125X240-50
The AirTAC SAIJ125X240-50 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel by up to 50 mm. This creates a highly flexible 190-240 mm usable stroke window, allowing you to fine-tune the retract end position during commissioning without adding external stops. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads with precision.
The extruded aluminum barrel includes sensor grooves on both sides for straightforward switch mounting, though this specific configuration ships without a magnet. It uses a robust 32 mm carbon steel rod with an M27x2 thread, paired with 40 mm air cushions at both ends to absorb kinetic energy. The PT tapered port threads ensure a tight, leak-free pneumatic connection at the G1/2 ports.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-50 |
|---|---|
| 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 SAIJ125X240-50
| 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 SAIJ125X240-50 Is Used
Product Size Changeovers
Quickly dial the retract position back by up to 50 mm when switching a packaging line to a different carton size, avoiding mechanical rebuilds.
Heavy Fixture Positioning
Leverage the 6136 N push force to move heavy machining fixtures into place while using the rear screw to set the exact clamping distance.
Assembly Line Calibration
Fine-tune the 190-240 mm travel window during initial commissioning to perfectly seat large components without relying on external shock absorbers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks the thrust for moving heavy fixtures, but a 160 mm bore is physically oversized for your machine envelope. The adjustable stroke is ideal for production lines running mixed product sizes, letting operators dial in the exact end-stop mechanically instead of swapping out entire cylinders. For load-holding without live air pressure, note that the rear adjuster acts only as a travel stop; you would need an external pilot-operated check valve or a related SAIL pneumatic lock cylinder.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 240 mm nominal stroke, 50 mm adjustment range, G1/2 PT ports, and your required mounting style. SAIJ supports a reduced set of mounts: Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 240 mm stroke is under the 300 mm side-load threshold, standard mounting is sufficient, though long unsupported loads should still use an external guide.
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 SAIJ125X240-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
A rear-mounted adjusting screw acts as a mechanical stopper, allowing you to shorten the 240 mm nominal stroke by up to 50 mm. This provides a usable travel window of 190-240 mm for fine-tuning the end position without replacing the cylinder.
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