Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-40 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 SAIJ125X140-40
The AirTAC SAIJ125X140-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a standard carbon steel rod and a PT tapered port. By integrating an external adjusting screw, this model allows you to fine-tune the effective travel window down to 100-140 mm without swapping out the entire unit.
Because the rear stopper simply trims the retract end-position, it acts as a travel stop rather than a load lock. The extruded aluminum barrel includes sensor grooves on both sides for adding CMSE reed or DMSE electronic switches. For applications requiring position holding without live air pressure, an external rod lock or a related SAIL pneumatic lock cylinder is necessary.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-40 |
|---|---|
| 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 SAIJ125X140-40
| 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 SAIJ125X140-40 Is Used
Product Changeover
Dial in the 100-140 mm retract window on the fly to accommodate different product lengths on a packaging line without changing cylinders.
End-Position Tuning
Fine-tune the exact bottom-out point during machine commissioning using the rear adjuster, ensuring precise mechanical alignment.
Heavy Forming Setup
Leverage the 6136N push force at 0.5 MPa for pressing operations, adjusting the stroke depth to prevent over-travel on sensitive tooling.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-40 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application requires substantial force but demands variable end-stops for product changeovers. If 6136N at 0.5 MPa is excessive, stepping down to an 80 mm bore yields 2513N; if you need more power, a 160 mm bore provides 10053N. The adjustable 40 mm window is ideal for dialing in exact retraction distances during commissioning, avoiding the need to bolt on external stops or buy multiple fixed-stroke SAI cylinders.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 140 mm nominal stroke, PT port thread, and mounting style. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, deliberately omitting FB, CA, CB, and CR. Note that operating speed for this bore size is 30-500 mm/s. Although the 140 mm stroke is relatively short, always ensure adequate external guiding if the load geometry induces high bending moments.
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 SAIJ125X140-40 FAQ
The rear adjusting screw acts as a mechanical stopper that shortens the effective stroke. For this model, you can trim the 140 mm nominal stroke back by up to 40 mm, creating a usable travel window of 100-140 mm to fine-tune the end position.
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach up to 11045N push force at 0.7 MPa.
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