Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-20
The AirTAC SAIJ125X70-20 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 32mm carbon steel piston rod and a PT G1/2 tapered port. By utilizing the 20mm adjustment screw, you can fine-tune the effective travel window down to 50mm without swapping out the entire unit.
This adjustable stopper allows for precise end-position tuning during commissioning or product-size changeovers. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches, though a magnet is not included on this base configuration. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125X70-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SAIJ125X70-20 Is Used
Product Changeover
Dial in the 50-70mm travel window during production line changeovers to accommodate slightly different package sizes without changing the cylinder.
End-Position Tuning
Fine-tune the retraction end-stop during machine commissioning to achieve exact clamping or positioning without adding external stops.
Heavy Forming
Leverage the 6136N push force for medium-duty pressing or forming tasks where the exact bottoming position needs micro-adjustments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-20 the Right Cylinder?
Select this 125mm bore when an 80mm cylinder's 2513N push force is insufficient but you still need compact 70mm nominal travel. The 20mm rear adjuster is chosen over a fixed SAI cylinder when the setup requires variable end-stops to dial in exact positioning. For operations needing load-holding without live air pressure, note that this rear adjuster acts only as a travel stop and not a lock; consider an external rod lock or the SAIL/BSAI series instead. To match this ISO 15552 interchangeable cylinder, confirm the 125mm bore, 70mm stroke, 20mm adjustment, PT port, and mounting style.
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 SAIJ125X70-20 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw lets you shorten the 70mm nominal stroke by up to 20mm, creating a usable travel window of 50-70mm. This allows you to set the exact retract end-position during setup without replacing the cylinder.
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