Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-30S 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 SAIJ125AX300-30S
The AirTAC SAIJ125X300-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial in the exact end-of-travel position. It provides a usable travel window of 270-300 mm, letting you trim the nominal 300 mm stroke by up to 30 mm during commissioning without adding external stops. This 125 mm bore generates 6133 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
Built with a SUS420J2 stainless steel rod (option A) for enhanced durability against wear, this model includes a magnet for CMSE reed and DMSE electronic sensors. It features PT tapered port threads (G1/2) and operates at speeds of 30-500 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, and the adjustable rear stopper acts purely as a travel end-deceleration point, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-30S |
|---|---|
| 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 SAIJ125AX300-30S
| 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 SAIJ125AX300-30S Is Used
Product Changeover
Dial in the 270-300 mm travel window during line format changes to accommodate different product lengths without swapping hardware.
Heavy Positioning
Leverage the 6133 N push force at 0.5 MPa to move heavy pallets or fixtures, stopping precisely at the tuned rear mechanical stop.
Sensor Integration
Utilize the -S magnet with DMSE solid-state or CMSE reed switches in the dual sensor grooves for precise position feedback.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-30S the Right Cylinder?
Select this 125 mm bore when an application requires heavy force, delivering 6133 N push at 0.5 MPa, or step down to the 100 mm bore if 3927 N is sufficient. The adjustable stroke is chosen over a fixed SAI cylinder when you need variable end-stops for product changeovers. For load-holding without live air pressure, note that the rear adjuster is only a stop; you would need an SAIL air-released lock, a BSAI clamp-lock, or an external rod lock. To match this ISO 15552 replacement, specify bore 125, stroke 300, 30 mm adjustment, PT G1/2 port, and the -S magnet.
Because the 300 mm stroke is substantial, the 32 mm rod diameter and M27x2 rod thread provide robust support, but long unsupported strokes still require an external guide to prevent excessive side-loading. Mounting options include the reduced SAIJ set: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR variants.
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 SAIJ125AX300-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6133 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 30 mm, providing a usable travel window of 270-300 mm. It acts as a mechanical stop to fine-tune the end position and does not lock the load without live air.
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