Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-30 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 SAIJ125AX300-30
The AirTAC SAIJ125X300-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 30 mm, creating a precise 270-300 mm usable stroke window. This bore delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks. The piston rod is constructed from SUS420J2 stainless steel, and the pneumatic ports use PT tapered threads.
Because the rear adjuster acts strictly as a mechanical stop to set the retraction end position, it does not hold the load without live air pressure. For true load-holding without continuous air, consider the SAIL or BSAI cylinder series. This model omits the FB, CA, CB, and CR mounting options, utilizing a focused set of ISO 15552 accessories (Basic, FA, LB, TC, FTC, TCM1, TCM2) to simplify machine integration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-30 |
|---|---|
| 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 SAIJ125AX300-30
| 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 SAIJ125AX300-30 Is Used
Heavy-Duty Press Tuning
Dial in the exact 270-300 mm retraction point during precision press setups without machining custom external stopper blocks.
Product Line Changeover
Quickly adapt end-of-stroke positions for varying product sizes on a packaging line by turning the rear adjuster screw.
Automated Assembly End Stops
Use the 6136 N push force to move heavy pallets into a fixed datum, relying on the built-in stop to set the final resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-30 the Right Cylinder?
Choose this 125 mm bore when your application requires more thrust than the 80 mm class (which provides 2513 N push at 0.5 MPa) but does not need the full 10053 N output of the 160 mm variant. The adjustable 270-300 mm stroke is ideal for machine changeovers, allowing operators to fine-tune the end stop during commissioning without swapping out the entire cylinder or adding external shims.
Given the 300 mm stroke length, the 32 mm diameter rod should be externally guided to prevent side-load damage on the seals. If your process requires pneumatic position sensing, note that this specific SKU is not equipped with a magnet, so standard AirTAC CMSE reed or DMSE electronic sensors will not function without upgrading to an -S variant. The cylinder operates at speeds of 30-500 mm/s.
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 SAIJ125AX300-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjusting screw acts as a mechanical stop that lets you shorten the 300 mm nominal stroke by up to 30 mm, providing a usable travel window of 270-300 mm. It sets the end position but does not lock the load without continuous air pressure.
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