Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-20
The AirTAC SAIJ125X135-20 is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa, utilizing a 32mm carbon steel piston rod with an M27x2 thread to handle high side loads. The integrated air cushions at both ends provide 40mm of deceleration travel, safely absorbing kinetic energy within its 30-500 mm/s speed range.
This specific SKU features a 135mm nominal stroke paired with a 20mm adjustment screw, creating a usable travel window of 115-135mm. This built-in adjustability allows operators to fine-tune end positions during commissioning or product changeovers without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept CMSE reed or DMSE electronic sensors if a magnet is added later. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125X135-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125X135-20 Is Used
Product Changeover
Dial in the 115-135mm travel window during format changes to accommodate different carton or part sizes without replacing the cylinder.
End-Stop Tuning
Fine-tune the retraction end position during machine commissioning to perfect positioning without fabricating external mechanical stops.
Heavy Payload Handling
Leverage the 6136N thrust at 0.5 MPa to push heavy workpieces or actuators, relying on the 40mm cushioning to safely decelerate the mass.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-20 the Right Cylinder?
Choose this 125mm bore when an application requires over 6000N of thrust at 0.5 MPa, or step down to the 100mm bore (3927N push at 0.5 MPa) if your load requirements are lower. The adjustable stroke is ideal for production lines running mixed product sizes, as the 115-135mm window allows rapid end-stop tuning without physically swapping the cylinder. For any mounting setup involving strokes of 135mm or more, ensure an external guide supports the load to prevent excessive rod side-loading.
When specifying a replacement, match the 125mm bore, 135mm stroke, 20mm adjustment range, PT tapered port, and the standard carbon steel rod. Remember that the rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure; for true pneumatic locking without 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 SAIJ125X135-20 FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder generates 6136N of push thrust and 5734N of pull thrust. At 0.9 MPa, the push force increases to 11045N.
The rear adjuster screw lets you mechanically shorten the 135mm nominal stroke by up to 20mm, providing an effective travel window of 115-135mm. This stopper sets the end position but does not lock the load without continuous air pressure.
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