Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-20 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 SAIJ125AX70-20
The AirTAC SAIJ125X70-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster, giving you a usable travel window of 50-70mm from its 70mm nominal stroke. Delivering 6136N of push force at 0.5MPa, it handles heavy positioning tasks. The SUS420J2 stainless steel rod provides corrosion resistance for harsher industrial environments.
Equipped with a PT tapered port thread and dual-side sensor grooves, this cylinder supports precise end-position tuning during commissioning without requiring external stops. The rear adjuster acts solely as a travel stop and relies on the integrated variable air cushions for end-of-stroke deceleration; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-20 |
|---|---|
| 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 SAIJ125AX70-20
| 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 SAIJ125AX70-20 Is Used
Product Changeover Positioning
Dial in the 50-70mm travel window during line changeovers to accommodate varying package sizes without physically swapping out the cylinder.
Heavy-Duty Machine Setup
Leverage the 6136N push force at 0.5MPa for pressing and forming applications, using the rear screw to fine-tune the exact end-stop during initial commissioning.
Variable End-Stop Clamping
Adjust the clamping depth precisely on the fly for different material thicknesses, relying on the rear stopper to set the retract position accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-20 the Right Cylinder?
Selecting this 125mm bore model makes sense when your application requires the 6136N thrust at 0.5MPa (or 8590N at 0.7MPa) combined with on-the-fly end-position tweaking. If your force requirements are lower, stepping down to a 100mm bore yields 3927N at 0.5MPa, whereas a 160mm bore provides 10053N for heavier loads. The adjustable stroke is ideal for machine setups needing a variable end-stop during product changeovers rather than swapping a fixed-stroke SAI cylinder.
For ISO 15552 replacement matching, ensure you specify the 125mm bore, 70mm stroke, 20mm adjustment range, PT port thread, and the SUS420J2 rod material. Because the plain SAIJ lacks a magnet, position sensing requires adding a magnet (-S) to use CMSE reed or DMSE electronic sensors. Remember that the rear adjuster is a stop, not a lock; for load-holding without live air, consider the SAIL or BSAI series.
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 SAIJ125AX70-20 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The SAIJ125X70-20 has a rear adjusting screw that allows you to shorten the effective stroke by up to 20mm, creating a usable travel window of 50-70mm. This stopper fine-tunes the end position but does not lock or hold the load without continuous air pressure.
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