Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20S
The AirTAC SAIJ125X140-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 6136N push force at 0.5MPa and features a built-in magnet for position sensing. The external rear stopper allows you to fine-tune the effective travel down from 140mm to a 120mm minimum, yielding a 120-140mm usable window without swapping hardware.
This bore utilizes a G1/2 port and a robust M27x2 rod thread to handle substantial loads. The extruded aluminum barrel includes sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic switches. Mounting options cover the reduced SAIJ set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125X140-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125X140-20S Is Used
Variable End-Stop Tuning
Dial in the precise retract position within the 120-140mm window during machine commissioning to perfect product seating without adding external stopper blocks.
Product Changeover
Quickly adapt the cylinder's effective stroke on the fly when switching the production line to a different package size or material thickness.
Heavy Clamping Setup
Leverage the 6136N pull force to secure heavy workpieces while using the rear screw to set the exact clamping depth for varying material dimensions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-20S the Right Cylinder?
Choose this adjustable-stroke model when a fixed 140mm SAI cylinder cannot accommodate part-size variances or precise end-position tuning during commissioning. The rear adjuster acts purely as a travel stop for deceleration; it does not hold the load without live air pressure. For true fail-safe load holding, select the SAIL or BSAI series instead.
When matching an ISO 15552 replacement, verify the 125mm bore, 140mm stroke, -20mm adjustment, PT tapered port threads, and the -S magnet. If your application requires less force, stepping down to the 100mm bore provides 3927N at 0.5MPa.
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 SAIJ125X140-20S FAQ
At 0.5MPa operating pressure, it provides 6136N of push thrust and 5734N of pull thrust. At the maximum 1.0MPa pressure, the push force reaches 1251 kgf.
The rear adjuster screw acts as an external stopper that mechanically limits the piston's retract travel. You can trim the effective stroke back by up to 20mm from the 140mm nominal length, creating a 120-140mm usable travel window for fine-tuning end positions.
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