Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20
The 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 interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20
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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. 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?
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
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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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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