Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-40S 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 SAIJ125AX180-40S
The AirTAC SAIJ125X180-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 140-180mm usable travel window. In the standard SAI configuration, this bore generates 6136N of push force and 5734N of pull force at 0.5 MPa. Equipped with a -S magnet, it supports position sensing via AirTAC CMSE reed and DMSE electronic solid-state switches installed in the dual-side sensor grooves.
This unit incorporates an SUS420J2 stainless steel rod (material code A) paired with a PT tapered port thread, making it dimensionally interchangeable with ISO 15552 cylinders. The rear adjuster functions strictly as a mechanical stop to fine-tune the retract end position during commissioning. It does not hold the load without live air pressure; for true pneumatic locking, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-40S |
|---|---|
| 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 SAIJ125AX180-40S
| 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 SAIJ125AX180-40S Is Used
Variable End-Stop Setup
Dial in the 140-180mm travel window during machine commissioning to accommodate different material thicknesses without physically swapping the actuator.
Product Changeover Lines
Quickly retract the end position by up to 40mm when switching between varying product sizes on a high-throughput conveyor system.
Heavy Forming Operations
Leverage the 6136N push force at 0.5 MPa to execute robust pressing or clamping tasks while fine-tuning the final stroke position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-40S the Right Cylinder?
Selecting this 125mm bore over a smaller 100mm option steps the thrust up from 3927N to 6136N at 0.5 MPa, providing the necessary force for heavier actuation tasks. The 40mm adjustment range is ideal for variable end-stops and machine setups where product sizes frequently change on the line, eliminating the need to swap out a fixed-stroke SAI cylinder. Because the 180mm stroke is relatively short, external side-load guides are less critical here, though the robust 32mm rod and M27x2 thread naturally handle higher bending loads.
When specifying a replacement, ensure the 125mm bore, 180mm nominal stroke, 40mm adjustment, PT G1/2 port, and -S magnet match your footprint. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting the FB, CA, CB, and CR styles found on some standard cylinders.
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 SAIJ125AX180-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore double-acting cylinder provides 6136N of push force and 5734N of pull force. It can reach up to 11045N push force at 0.9 MPa.
The rear adjuster acts as a mechanical stop that shortens the 180mm nominal stroke by up to 40mm, creating a 140-180mm usable travel window. It only sets the end position and does not lock or hold the load without continuous air pressure.
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