Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-75S 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 SAIJ125AX75-75S
The AirTAC SAIJ125X75-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical adjuster, allowing you to dial back the stroke by up to 75 mm. This creates a highly versatile 0-75 mm usable travel window, letting you fine-tune the retract end-position during commissioning without swapping out the cylinder or adding bulky external stops. It delivers robust thrust, pushing with 6136 N and pulling with 5734 N at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This specific configuration features an SUS420J2 stainless steel rod (code A) for enhanced durability against moisture and a built-in magnet (-S) for position sensing with AirTAC CMSE reed and DMSE electronic switches. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting. It operates at speeds of 30-500 mm/s and utilizes PT tapered port threads (G1/2) for pneumatic connections. The rear adjuster acts purely as a travel stop and deceleration point, meaning it will not hold a load safely without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-75S |
|---|---|
| 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 SAIJ125AX75-75S
| 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 SAIJ125AX75-75S Is Used
Machine Changeover
Quickly adapt retract distances during product-size changeovers on a packaging line using the 0-75 mm adjustment range, eliminating the need to physically swap cylinders for different package dimensions.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy jigs or molds into exact alignment, using the rear stopper to guarantee precise end-positioning every cycle.
Commissioning Calibration
Fine-tune the final end-of-stroke position during initial machine commissioning without fabricating custom external stopper blocks, saving engineering time and reducing setup errors.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-75S the Right Cylinder?
Selecting this 125 mm bore adjustable cylinder makes sense when your application demands exact end-position tuning at machine setup or during product-size changeovers on a line. If your process requires slightly less force, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa. However, the SAIJ125X75-75-S provides a significantly higher 6136 N output while offering the distinct advantage of an adjustable 0-75 mm travel window. For applications needing 1500 mm or longer strokes, note that 75 mm is the maximum standard stroke limit for this bore size.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 75 mm base stroke, 75 mm adjustment range, PT G1/2 port thread, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR configurations. If your machinery needs to hold a load securely without live air pressure, this cylinder's adjuster will not act as a brake; instead, consider the AirTAC SAIL (air-released lock) or BSAI (clamp-lock) series for fail-safe load holding.
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 SAIJ125AX75-75S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At the maximum pressure of 1.0 MPa, it can deliver up to 1251 kgf of push force.
The rear adjuster screw acts as a mechanical stop that allows you to shorten the 75 mm nominal stroke by up to 75 mm, creating a usable travel window of 0-75 mm. It functions as a travel stop and deceleration point, but it does not lock or hold the load without continuous live air pressure.
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