Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-50S 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 SAIJ125AX180-50S
The AirTAC SAIJ125X180-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 130 to 180 mm. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads with precision. The extruded aluminum barrel features sensor grooves on both sides, and this -S variant includes a magnet for direct compatibility with CMSE reed and DMSE electronic switches.
This model uses a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and features PT tapered port threads. The rear adjuster acts purely as a mechanical stop to fine-tune the retract position during commissioning. It is not a locking device, so load holding without live air requires a SAIL or BSAI variant. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-50S |
|---|---|
| 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 SAIJ125AX180-50S
| 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 SAIJ125AX180-50S Is Used
Product Changeover
Quickly dial in the 130-180 mm travel window during line size changes without physically swapping the actuator.
Heavy Pressing
Leverage 6136 N of thrust at 0.5 MPa for pressing operations that need precise end-position tuning.
Machine Setup
Fine-tune the retract stop during commissioning to perfect machine timing without adding external stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-50S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks thrust, but a 160 mm bore is physically too large. The 50 mm adjustment window is ideal for product changeovers, allowing you to dial in the exact end position without swapping cylinders or adding external stops. If your application requires the load to be held without continuous air pressure, you must integrate an external rod lock or switch to a SAIL pneumatic lock cylinder.
For a direct ISO 15552 replacement match, verify the 125 mm bore, 180 mm nominal stroke, 50 mm adjuster, PT port threads, and the -S magnet option. Because the stroke is under 300 mm, side-load stress is manageable, but the 32 mm rod should still be guided to prevent binding. Operating speed for this bore size ranges from 30 to 500 mm/s.
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 SAIJ125AX180-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you mechanically shorten the effective stroke from its 180 mm nominal length down to 130 mm. It functions as a travel stop for end-position tuning and does not lock the load without live air.
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