Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-50S 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 SAIJ125AX70-50S
The AirTAC SAIJ125X70-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 20 to 70 mm for precise end-position tuning. It delivers a robust push force of 6136 N at 0.5 MPa, making it well suited to heavy-duty positioning tasks. The integrated -S magnet supports AirTAC CMSE reed and DMSE solid-state sensors housed in the dual-side barrel grooves.
This variant features a SUS420J2 stainless steel rod (code A) paired with PT tapered port threads. The rear stopper allows you to trim the effective stroke by up to 50 mm without swapping the cylinder or adding external stops, which is ideal for product changeovers. Note that the adjuster acts purely as a travel stop, not a lock; the cylinder cannot hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-50S |
|---|---|
| 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 SAIJ125AX70-50S
| 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 SAIJ125AX70-50S Is Used
Product Changeovers
Dial in the 20-70 mm travel window during product size transitions without physically swapping out the cylinder.
Commissioning Tuning
Fine-tune the retract end-position at machine setup to absorb minor mechanical clearances and achieve exact positioning.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move and stop heavy pallets or fixtures with adjustable precision.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-50S the Right Cylinder?
Choose this 125 mm bore when your application requires more thrust than the 80 mm bore (which provides 2513 N at 0.5 MPa) but less than the massive 160 mm bore (10053 N). The adjustable stroke is invaluable for dialing in exact end positions during commissioning or when accommodating slight product size variations on a line, offering flexibility a fixed-stroke SAI cylinder cannot.
If your setup needs to hold a load safely without continuous air pressure, the SAIJ is not the right choice—you should look at the SAIL or BSAI locking cylinders instead. When replacing an ISO 15552 cylinder, match the 125 mm bore, 70 mm stroke, 50 mm adjustment, PT port, and -S magnet. The SAIJ mounting set includes 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 SAIJ125AX70-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. It can deliver up to 8590 N at 0.7 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 70 mm nominal stroke by up to 50 mm, giving an effective travel window of 20 to 70 mm. It only sets the end position and does not lock the load without live air.
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