Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-20S 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 SAIJ125X135-20S
The AirTAC SAIJ125X135-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a substantial 6136N of push force at 0.5MPa and operates at speeds of 30-500mm/s. By turning the integrated rear stopper screw, you can fine-tune the effective travel window anywhere between 115mm and 135mm without physically swapping the unit.
This 125mm bore actuator features a standard carbon steel piston rod and PT G1/2 threaded ports. The integrated magnet (-S) supports position detection via AirTAC CMSE reed and DMSE electronic solid-state sensors fitted into the dual-side sensor grooves on the extruded aluminum barrel. The variable air cushions at both ends absorb kinetic energy, but remember that the rear adjuster is strictly a travel stop, not a locking mechanism.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-20S |
|---|---|
| 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 SAIJ125X135-20S
| 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 SAIJ125X135-20S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 115mm and 135mm during machine commissioning to accommodate varying material thicknesses without external stop blocks.
Product-Size Changeover
Quickly readjust the cylinder's travel end on automated packaging lines when switching between different carton or container dimensions.
Fine-Tune End Positions
Eliminate mechanical tolerance buildup by using the rear adjuster to set the precise bottoming-out point for high-repetition assembly machinery.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-20S the Right Cylinder?
Choose this adjustable model when your machine setup requires precise end-position tuning during commissioning or frequent product-size changeovers, avoiding the need to bolt on external stops or purchase multiple fixed-stroke SAI cylinders. If your thrust requirements are lower, stepping down to an 80mm bore yields 2513N of push force at 0.5MPa, whereas a 160mm bore provides 10053N for heavier loads.
When matching this component to an existing ISO 15552 footprint, verify the 135mm stroke, the 20mm adjustment range, G1/2 PT ports, and the required -S magnet. Because the stroke is under 300mm, side-load stress on the 32mm rod is minimal, though an external guide remains recommended for heavy radial loads. For applications that must hold a load without continuous live air pressure, this cylinder will not suffice; instead, look to the SAIL pneumatic lock or BSAI clamp-lock variants.
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 SAIJ125X135-20S FAQ
At 0.5MPa, it provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear stopper screw allows you to mechanically shorten the 135mm nominal stroke by up to 20mm, creating a usable travel window of 115-135mm for precise end-position tuning.
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