Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-20 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 SAIJ125X350-20
The AirTAC SAIJ125X350-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 8590N push force at 0.7 MPa. A 350 mm nominal stroke can be dialed back by up to 20 mm, providing a 330-350 mm usable travel window for precise end-position tuning during commissioning. This built-in adjuster eliminates the need to swap cylinders or bolt on external stops when adapting to new product sizes.
This 125 mm bore unit features a 32 mm carbon steel piston rod and a PT G1/2 port, designed to handle heavy loads with minimal deflection. The extruded aluminum barrel includes sensor grooves on both sides, and because no magnet is specified, position sensing can be added later by selecting an -S variant to work with AirTAC CMSE reed or DMSE electronic sensors.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-20 |
|---|---|
| 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 SAIJ125X350-20
| 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 SAIJ125X350-20 Is Used
Machine Changeovers
Fine-tune the 330-350 mm travel window during product size changeovers without swapping out the entire cylinder or adding external mechanical stops.
Heavy Pressing Operations
Leverage the 8590N push force at 0.7 MPa for heavy-duty pressing, clamping, or forming tasks that require precise end-of-stroke positioning.
Automated Assembly Lines
Integrate the ISO 15552 profile cylinder into large-scale automated lines, utilizing the PT G1/2 port and 32 mm rod for robust, high-flow actuation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-20 the Right Cylinder?
Choose this adjustable model over a fixed-stroke SAI when your application requires variable end-stops or frequent product-size changeovers. If your thrust requirements are lower, stepping down to a 100 mm bore yields 5497N at 0.7 MPa, while stepping up to a 160 mm bore provides 14074N for heavier fixtures. To match this ISO 15552 footprint, verify the 125 mm bore, 350 mm stroke, 20 mm adjustment, PT G1/2 port, and standard carbon steel rod.
Because the 350 mm stroke is relatively long for this bore size, an external guide is recommended to prevent excessive side-loading on the rod. Note that the rear adjuster functions strictly as a travel stop, not a lock; the cylinder will not hold its load without live air pressure. For true load-holding without continuous air, consider the SAIL or BSAI series. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X350-20 FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder generates a push force of 8590N and a pull force of 5734N. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective travel from the nominal 350 mm down to 330 mm. This creates a 330-350 mm usable window for fine-tuning the retract end position without replacing the cylinder.
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