Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 175mm 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
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40
The AirTAC SAIJ125X175-40 is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical adjuster, providing a usable travel window of 135 to 175 mm. Delivering 6136 N of push force at 0.5 MPa, it is built to handle heavy-duty positioning tasks. The extruded aluminum barrel features sensor grooves on both sides, allowing for straightforward integration of CMSE reed or DMSE electronic switches when position feedback is required.
This model utilizes a carbon steel piston rod with an M27x2 thread and a G1/2 port. The rear adjuster functions strictly as a travel stop for end-position tuning during commissioning; it does not lock the load without continuous air pressure. For applications requiring true load-holding, the SAIL or BSAI series would be required instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 175 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 SAIJ125X175-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×175 | 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 SAIJ125X175-40 Is Used
Variable Length Diverter
Adjust the retract stop by up to 40 mm to change the push distance of a diverter arm, accommodating different box sizes on a conveyor without changing hardware.
Heavy Press Calibration
Fine-tune the end position of a 6136 N pressing operation during machine setup, ensuring perfect contact depth before locking down the tooling.
Product Changeover Stops
Quickly reconfigure the stroke window from 135 to 175 mm on a palletizing station when switching to a new product format, minimizing downtime.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore is physically too large. The 40 mm adjustment range is ideal for product changeovers on a packaging line, allowing operators to dial in the exact retract distance without swapping out the entire cylinder or adding external stops. To replace this cylinder with an ISO 15552 equivalent, match the 125 mm bore, 175 mm stroke, PT port threads, and the specific 40 mm adjustment range.
Because the nominal stroke is 175 mm, side-load stress is moderate, but relying on the M27x2 carbon steel rod alone is not recommended for unsupported loads. Always guide the tooling externally to prevent premature seal wear. The SAIJ supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options 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 SAIJ125X175-40 FAQ
At a standard operating pressure of 0.5 MPa, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At its maximum rated pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke from its 175 mm nominal length down to as little as 135 mm. This provides a 40 mm tuning window for precise end-position calibration without needing to replace the cylinder.
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