Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75
The AirTAC SAIJ125X185-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Its integrated PT G1/2 port and 32mm carbon steel rod provide a robust interface for heavy pneumatics. By turning the rear screw, you can trim the forward travel, creating a precise 110 to 185mm usable window without swapping hardware.
This adjuster functions purely as a mechanical stop to set the end position, working alongside the standard 40mm air cushions to decelerate the load; it does not hold the load without live air. The extruded aluminum barrel features sensor grooves on both sides, allowing you to easily add CMSE or DMSE switches for position feedback.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125X185-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125X185-75 Is Used
Product Size Changeovers
Rapidly reconfigure the 110-185mm stroke window on packaging lines handling varying carton dimensions without replacing the cylinder.
End-Stop Calibration
Fine-tune the final retracted position during machine commissioning to achieve precise mechanical alignment without adding external spacers.
Heavy Forming Press
Leverage the 6136N push force at 0.5 MPa for heavy-duty pressing operations, using the rear stop to set exact material deformation depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75 the Right Cylinder?
Select this 125mm bore when a smaller 100mm cylinder (providing 3927N push at 0.5 MPa) cannot meet your thrust requirements, but you want to avoid stepping up to a larger 160mm unit. The 75mm adjustment range is ideal for production lines running multiple product sizes, as operators can dial in the exact end-stop during changeover instead of installing external stops or fixed SAI cylinders. Because the stroke is 185mm, ensure external guiding is used if the application induces severe side loads.
For a direct ISO 15552 replacement match, verify the 125mm bore, 185mm stroke, 75mm adjustment, PT G1/2 port, and your required mounting style. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, but omits FB, CA, CB, and CR brackets. Remember that for load-holding without continuous air pressure, you must use a SAIL locking cylinder or an external rod lock.
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 SAIJ125X185-75 FAQ
At 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 screw allows you to shorten the 185mm nominal stroke by up to 75mm, providing an effective travel range of 110 to 185mm. It acts as a mechanical stop to set the end position and does not lock the load without live air pressure.
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