Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 220mm 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
- Stroke220 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-40
The AirTAC SAIJ125X220-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 220 mm nominal stroke that can be dialed back by up to 40 mm, yielding a highly versatile 180-220 mm usable travel window for precise end-position tuning during commissioning. Delivering 6136 N of push force and 5734 N of pull force at 0.5 MPa, it handles heavy loads with a robust 32 mm rod and M27x2 rod thread.
This variant uses a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features PT tapered port threads (G1/2). The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. To track piston position, you would need to specify the -S magnet option to use AirTAC CMSE reed or DMSE solid-state sensors.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 220 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 SAIJ125AX220-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×220 | 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 SAIJ125AX220-40 Is Used
Machine Setup & Changeover
Dial in the exact end-stop position during tooling changeovers by adjusting the rear screw from 180 to 220 mm, eliminating the need to physically swap out the entire cylinder.
Variable Product Stops
Adapt to different package sizes on a heavy-duty conveyor line by fine-tuning the retract stroke up to 40 mm, ensuring precise positioning without adding external mechanical stops.
Heavy Assembly Pressing
Leverage 6136 N of thrust at 0.5 MPa for pressing operations while using the rear adjuster to set the exact bottoming depth for delicate components.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-40 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application requires substantial thrust—6136 N at 0.5 MPa—but also demands on-the-fly end-stop adjustments without swapping hardware. If you need less force, stepping down to the 100 mm bore yields 3927 N at 0.5 MPa. The adjustable stroke is ideal for product changeovers on a line, letting you trim the travel window down to 180 mm via the rear screw rather than adding external stops.
Because the 220 mm stroke exceeds 300 mm? No, but even at 220 mm, the 32 mm rod and M27x2 thread provide excellent rigidity, though long unsupported loads still require an external guide. Remember that the rear adjuster acts only as a travel stop, not a lock; the SAIJ does not hold position without live air. For true load-holding, consider the SAIL or BSAI series. This model is dimensionally interchangeable per ISO 15552 and uses the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
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 SAIJ125AX220-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster acts as a mechanical stop that allows you to shorten the 220 mm nominal stroke by up to 40 mm, creating a 180-220 mm usable travel window. It only sets the travel end and does not lock the load without live air pressure.
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