Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20
The AirTAC SAIJ125X350-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 350 mm stroke that can be dialed back by up to 20 mm, giving operators a precise 330-350 mm usable travel window during commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU is not equipped with a magnet for position detection.
This unit uses a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance compared to standard carbon steel. The rear adjuster acts purely as a mechanical stop to fine-tune the retract end position without adding external stops; it does not lock the load. For applications requiring position holding without live air pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125AX350-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125AX350-20 Is Used
Machine Changeover
Dial in the 330-350 mm travel window during product size changes without physically swapping out the entire cylinder or adding external shims.
End-Position Tuning
Fine-tune the retract stroke end exactly to the process requirement at commissioning, using the rear stopper to absorb minor mechanical variations.
Heavy-Duty Forming
Leverage the 6136 N push force at 0.5 MPa for pressing or holding heavy assemblies, relying on the robust 32 mm rod for stability.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20 the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires the 6136 N push force at 0.5 MPa (or 8590 N at 0.7 MPa) and on-the-fly end-position tuning. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa, while stepping up to a 160 mm bore provides 10053 N. The adjustable 330-350 mm travel window is ideal for product changeovers, replacing fixed-stroke SAI cylinders when exact end stops vary.
Because the 350 mm stroke is substantial, the 32 mm rod diameter and M27x2 rod thread provide robust support, but an external guide is recommended for long unsupported strokes to prevent side-loading damage. To match this ISO 15552 interchangeable cylinder, specify a 125 mm bore, 350 mm stroke, 20 mm adjustment, PT tapered port thread, and your desired mounting from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). The operating speed range for this bore is 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 SAIJ125AX350-20 FAQ
The rear adjuster acts as a mechanical stop that shortens the effective stroke by up to 20 mm. This creates a 330-350 mm usable travel window, allowing you to fine-tune the end position at commissioning. The adjuster only sets the travel end and does not lock the load without live air pressure.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N. The operational speed range for this 125 mm bore is 30-500 mm/s.
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