Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20
The AirTAC SAIJ125X140-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. By turning the rear stopper screw, you can trim the effective travel back by up to 20 mm, creating a precise 120-140 mm usable stroke window without needing external stops. This fine-tuning capability is invaluable during machine commissioning or product size changeovers.
Built with a robust 32 mm carbon steel rod and M27x2 thread, this bore size handles substantial side loads, though long unsupported strokes still require external guidance. It features PT tapered ports and operates at speeds of 30-500 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept CMSE reed or DMSE electronic switches if a magnet is specified later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125X140-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125X140-20 Is Used
Product Size Changeovers
Quickly dial in the 120-140 mm stroke window when switching a packaging line to a different carton size, ensuring precise end-of-stroke positioning without swapping cylinders.
Machine Commissioning
Fine-tune the final retract position during setup to achieve exact alignment of heavy 125 mm bore tooling, avoiding the need to machine custom external spacers.
Variable End-Stop Clamping
Apply up to 6136N of clamping force at 0.5 MPa while adjusting the travel limit to accommodate parts with slight dimensional variations in heavy assembly lines.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (offering 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore is physically too large. The adjustable 120-140 mm window is selected over a fixed-stroke SAI when a machine handles multiple product sizes, allowing operators to dial in the exact end position on the fly.
Because the stroke is under 300 mm, side-load stress is manageable, but always verify rod alignment. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for fail-safe load holding, consider an external rod lock or the AirTAC SAIL series. This model uses PT ports and supports the SAIJ mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X140-20 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136N of push force and 5734N of pull force. It can reach up to 11045N push force at 0.7 MPa.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 140 mm nominal stroke by up to 20 mm. This creates a usable travel window of 120-140 mm; however, it is a stop, not a lock, and will not hold the load without continuous air pressure.
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