Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-50
The AirTAC SAIJ125X75-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 25 to 75 mm without adding external stops. It delivers robust thrust, pushing 6136N and pulling 5734N at 0.5 MPa, making it ideal for heavy-duty positioning tasks. The carbon steel piston rod features an M27x2 thread, providing a robust interface for high side-load resilience.
Unlike a fixed-stroke SAI cylinder, this model uses a rear mechanical stopper to set the exact retract end-position during commissioning. The extruded aluminum barrel includes sensor grooves on both sides, and because no magnet is specified, you would add an -S suffix to the SKU if you later require CMSE reed or DMSE electronic sensors.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125X75-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SAIJ125X75-50 Is Used
Product Changeovers
Quickly dial the stroke back from 75mm to 25mm to accommodate varying product sizes on a packaging line without changing hardware.
Heavy Positioning
Leverage the 6136N push force at 0.5 MPa to move heavy pallets or chassis into exact alignment before a machining operation.
Commissioning Calibration
Fine-tune the retract end-position during initial machine setup to perfect timing sequences without fabricating custom external spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-50 the Right Cylinder?
Select this 125mm bore cylinder when your application requires maximum push force up to 6136N at 0.5 MPa, or step down to an 80mm bore if your load only requires 2513N. The 50mm adjustment range is particularly useful for product-size changeovers on a line, allowing operators to dial in the exact end-stop without swapping out the cylinder. Mounting options include the reduced SAIJ set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Because the 75mm nominal stroke is well under the 1500mm maximum, side-loading is minimal, but always ensure the M27x2 rod is properly aligned to prevent premature seal wear. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true fail-safe load holding, consider the SAIL pneumatic lock or BSAI clamp-lock series instead.
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 SAIJ125X75-50 FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. It can reach a maximum push force of 1251 kgf at 1.0 MPa.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective travel from the nominal 75mm down to a minimum of 25mm, creating a 25-75mm usable window. It only sets the end-position and does not lock the load without continuous air pressure.
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