Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75S
The AirTAC SAIJ125X300-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 300 mm nominal travel by up to 75 mm. This yields a usable 225-300 mm end-position window, which is ideal for fine-tuning machine setups during product changeovers without swapping out the physical actuator. It delivers 6136 N of push force at 0.5 MPa and features a G1/2 port with a 40 mm cushion stroke to smoothly decelerate heavy loads.
This specific SKU is configured with a SUS420J2 stainless steel rod (code A) for improved corrosion resistance and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides. Because the 300 mm stroke is substantial for a 125 mm bore, the 32 mm rod and M27x2 thread provide a robust interface, but an external guide is still recommended to prevent side-load damage on long unsupported travels.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125AX300-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125AX300-75S Is Used
Product Changeover Tuning
Quickly adjust the 225-300 mm travel window during packaging format changes to accommodate different carton sizes without replacing the actuator.
Variable End-Stop Setup
Fine-tune the retract end-position at machine commissioning using the rear screw, eliminating the need to fabricate and bolt on external mechanical stops.
Heavy Material Handling
Leverage the 6136 N push force and 40 mm cushion stroke to move and decelerate heavy workpieces on automated assembly lines safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75S the Right Cylinder?
Select this 125 mm bore actuator when your application requires 6136 N of push force or 5734 N of pull force at 0.5 MPa. If your process demands less force, stepping down to a 100 mm bore yields 3927 N of push force, while stepping up to a 160 mm bore provides 10053 N. The core advantage of choosing this SAIJ model over a fixed-stroke SAI cylinder is the rear mechanical stopper, which allows for variable end-stops and precise commissioning tuning without adding external stop blocks.
When matching this ISO 15552 cylinder for a replacement, verify the 300 mm stroke, 75 mm adjustment range, PT tapered port threads, and the -S magnet requirement. The available mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. Note that the rear adjuster acts purely as a travel stop and does not hold the load without live air pressure; for true load-holding without air, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125AX300-75S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure rating.
The SAIJ125X300-75-S features a rear adjusting screw that acts as a mechanical stopper, allowing you to shorten the effective stroke by up to 75 mm from the 300 mm nominal length. This provides a usable travel window of 225-300 mm for fine-tuning end positions.
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