Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-20S 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 SAIJ125X70-20S
The AirTAC SAIJ125X70-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 50 to 70 mm, allowing you to dial back the 70 mm nominal stroke by up to 20 mm during commissioning without adding external stops. Belonging to the 125 mm bore class, it delivers 6136 N of push thrust at 0.5 MPa and utilizes a PT tapered G1/2 port.
This variant includes a standard carbon steel piston rod and a built-in magnet (-S) for position sensing with CMSE reed or DMSE electronic switches. The extruded aluminum barrel incorporates sensor grooves on both sides, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2 interfaces.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-20S |
|---|---|
| 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 SAIJ125X70-20S
| 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 SAIJ125X70-20S Is Used
Product Changeovers
Dial in the 50-70 mm travel window during format size changes on packaging machinery without physically replacing the cylinder.
End-Position Tuning
Fine-tune the retract stop during machine commissioning to perfectly time the seating of heavy 125 mm bore components.
Heavy Assembly Stations
Leverage 6136 N of thrust at 0.5 MPa for pressing or lifting tasks where exact endpoint depth is critical to cycle quality.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-20S the Right Cylinder?
Choose this 125 mm bore when your application requires substantial force, stepping up from a 100 mm bore that yields 3927 N at 0.5 MPa. The adjustable stroke is ideal for product changeovers on a line, letting you fine-tune the retract end-position on the fly rather than swapping a fixed-stroke SAI cylinder. To match this ISO 15552 replacement exactly, specify the 70 mm stroke, 20 mm adjustment, PT port thread, and the -S magnet option.
Because the rear adjuster acts only as a mechanical stop and the air cushions manage deceleration, neither will hold a load without live air pressure. For fail-safe load holding, consider the SAIL or BSAI series. Furthermore, the 32 mm rod diameter and M27x2 thread handle notable side loads, but any stroke over 300 mm would still require an external guide.
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 SAIJ125X70-20S FAQ
The rear adjuster screw lets you shorten the 70 mm nominal stroke by up to 20 mm, creating a 50-70 mm usable travel window. It sets the retract end-position but does not lock the load without live air pressure.
At a 0.5 MPa operating pressure, this double-acting cylinder provides 6136 N of push thrust and 5734 N of pull thrust. It can reach up to 1251 kgf at its maximum 1.0 MPa pressure rating.
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