Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-50S 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 SAIJ125X180-50S
The AirTAC SAIJ125X180-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and features a 32mm carbon steel rod with an M27x2 thread. The built-in magnet supports position sensing using CMSE reed or DMSE electronic switches mounted in the dual-side sensor grooves.
With a 180mm nominal stroke and a 50mm adjustment code, this model provides a usable travel window of 130-180mm. You can fine-tune the retract end-position at commissioning without swapping the cylinder or adding external stops. The extruded aluminum barrel design uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR mounts.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-50S |
|---|---|
| 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 SAIJ125X180-50S
| 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 SAIJ125X180-50S Is Used
Machine Changeover
Dial in the 130-180mm travel window during product size changes without physically swapping the actuator.
End-Position Tuning
Use the 50mm rear stopper screw to precisely set the retract distance during initial commissioning.
Variable End Stops
Adapt clamping or positioning depth on the fly for flexible production lines running mixed component batches.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-50S the Right Cylinder?
Choose this 125mm bore when 100mm (3927N push at 0.5MPa) lacks power, but a 160mm bore (10053N) is oversized. The adjustable stroke is ideal for variable end-stops and machine changeovers, unlike a fixed-stroke SAI cylinder. The rear adjuster acts as a travel stop, not a lock; for load-holding without live air, use an external rod lock or pilot-operated check valve. To replace an ISO 15552 cylinder, match the 125mm bore, 180mm stroke, 50mm adjustment, PT G1/2 port, and -S magnet.
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 SAIJ125X180-50S FAQ
At 0.5MPa it provides 6136N push and 5734N pull force. At 0.7MPa the push force increases to 8590N.
The rear adjuster lets you shorten the 180mm nominal stroke by up to 50mm, creating a 130-180mm usable travel window for fine-tuning without external stops.
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