Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 180mm 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
- Stroke180 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20S
The AirTAC SAIJ125X180-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa, utilizing a 32mm carbon steel rod and M27x2 thread to handle substantial loads. The integrated -S magnet enables precise position detection using AirTAC CMSE reed or DMSE electronic solid-state sensors housed within the dual-side sensor grooves.
This specific SKU features a 180mm nominal stroke that can be dialed back by up to 20mm, creating a 160-180mm usable travel window. This built-in adjustment allows you to fine-tune the retract end position at commissioning without adding external stops. The PT tapered port threads ensure a tight, leak-free pneumatic connection, while the extruded aluminum barrel maintains standard ISO 15552 mounting dimensions.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 180 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 SAIJ125X180-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×180 | 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 SAIJ125X180-20S Is Used
Product Changeover Tuning
Dial in the 160-180mm travel window during format changeovers to accommodate varying package sizes without swapping hardware.
End-Position Calibration
Use the rear stopper to micro-adjust the retract end position during machine commissioning, ensuring precise mechanical alignment.
Heavy Forming Stops
Leverage the 6136N thrust capacity for pressing operations while relying on the built-in stop to prevent over-travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20S the Right Cylinder?
Selecting this 125mm bore cylinder provides 6136N of thrust at 0.5 MPa; if your application requires less force, stepping down to a 100mm bore yields 3927N, whereas moving up to a 160mm bore offers 10053N. The adjustable stroke is chosen over a fixed SAI model when you need variable end-stops for rapid product-size changeovers on a line. To match this cylinder for an ISO 15552 replacement, verify the 180mm stroke, 20mm adjustment, PT port threads, and the -S magnet requirement.
Because the 180mm stroke is moderately long, ensure adequate external guiding to prevent excessive side-loading on the M27x2 rod. Remember that the rear adjuster functions strictly as a travel stop to set deceleration, not as a locking device; it will not hold the load without live air pressure. For true load-holding without continuous air, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X180-20S FAQ
At a standard 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster acts as a mechanical stop that shortens the 180mm nominal stroke by up to 20mm, resulting in a 160-180mm usable travel window. It sets the end position but does not lock the load without continuous air pressure.
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