Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-40 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 SAIJ125AX300-40
The AirTAC SAIJ125X300-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down from a 300 mm nominal stroke to a minimum of 260 mm. This creates a precise 260-300 mm usable window, giving you 40 mm of flexibility to dial in the retract end-position without swapping hardware. It delivers a robust 6136 N pull force at 0.5 MPa, making it suitable for heavy-duty positioning.
Equipped with a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance, this model uses 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, allowing you to easily mount CMSE reed or DMSE electronic switches if position feedback is required later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-40 |
|---|---|
| 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 SAIJ125AX300-40
| 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 SAIJ125AX300-40 Is Used
Product Size Changeover
Dial in the 260-300 mm retract window during line changeovers to accommodate different product lengths without replacing the cylinder.
Heavy-Duty Positioning
Leverage the 6136 N pull force to move heavy pallets or fixtures, using the rear stop to set the exact resting position.
Machine Setup Tuning
Fine-tune the end-of-stroke position at commissioning to perfect tooling alignment, avoiding the need to machine custom spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-40 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3681 N pull at 0.5 MPa) lacks the necessary force, but a 160 mm bore is physically oversized for your machine. The adjustable 260-300 mm travel window is perfect for production lines running mixed product sizes, letting operators change the retract end-stop during changeovers instead of adding external stops. Because the 300 mm stroke is substantial, ensure you provide an external guide to handle side loads, as the M27x2 rod thread and cushioning manage axial forces but cannot support unsupported lateral loads.
This cylinder is dimensionally interchangeable per ISO 15552. To match this configuration exactly, specify PT port threads, SUS420J2 rod material, and the 40 mm adjustment range. Remember that the rear adjuster acts only as a travel stop, not a lock; if your application requires the load to be held without live air pressure, you must use an external rod lock or select an AirTAC SAIL or BSAI series 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 SAIJ125AX300-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 6136 N of push force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw lets you shorten the 300 mm nominal stroke by up to 40 mm, creating a 260-300 mm travel window. It acts as a mechanical stop to set the end position, but it does not lock the load without continuous air pressure.
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