Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75S
The AirTAC SAIJ125X500-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 425 to 500 mm. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning. The barrel features sensor grooves on both sides, and this -S variant includes a magnet for direct compatibility with AirTAC CMSE reed and DMSE electronic solid-state switches.
This model uses a SUS420J2 stainless steel rod (option A) for superior corrosion resistance and features PT tapered port threads. The rear mechanical stopper allows you to fine-tune the retract end position during commissioning or product changeovers. Remember that this adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125AX500-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125AX500-75S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 425-500 mm window during machine setup, avoiding the need to fabricate external mechanical stops.
Product Changeover
Quickly adjust the stroke by up to 75 mm to accommodate different product sizes on an automated packaging line without changing cylinders.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or fixtures, relying on the 32 mm rod for robust actuation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-75S the Right Cylinder?
Select this 125 mm bore cylinder when you need substantial thrust—up to 6136 N push at 0.5 MPa. If your application requires less force, stepping down to an 80 mm bore yields 2513 N push at 0.5 MPa. The adjustable stroke is ideal for machinery requiring variable end-stops, giving you a 75 mm tuning window without swapping out the entire cylinder. To replace an ISO 15552 cylinder, match the 125 mm bore, 500 mm stroke, PT ports, and the -S magnet.
With a 500 mm stroke, the 32 mm diameter piston rod is subject to increased side-loading risks; always use an external guide to prevent rod binding. For applications needing true load-holding without continuous air pressure, a plain SAIJ is insufficient—consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX500-75S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective stroke from its 500 mm nominal length down to 425 mm. It sets the travel end but does not lock the load without live air pressure.
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