Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-100 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 SAIJ125X350-100
The AirTAC SAIJ125X350-100 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136 N push force at 0.5 MPa. It features a 125 mm bore, a 32 mm carbon steel piston rod, and PT tapered G1/2 ports. With a nominal 350 mm stroke, the external stopper lets you dial back the travel by up to 100 mm, creating a precise 250-350 mm usable window for commissioning.
This adjustable range is ideal for product changeovers on large machines, eliminating the need to physically swap cylinders or bolt on external stops. The extruded aluminum barrel includes sensor grooves on both sides for standard CMSE reed or DMSE electronic switches. Remember that the rear adjuster acts strictly as a travel stop and works alongside the 40 mm air cushions to decelerate the load, but it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-100 |
|---|---|
| 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 SAIJ125X350-100
| 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 SAIJ125X350-100 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 250 and 350 mm on the fly, perfect for accommodating different material thicknesses without changing out tooling.
Heavy Machine Changeover
Leverage the 6136 N thrust at 0.5 MPa to shift heavy fixtures, using the 100 mm adjuster to rapidly reconfigure the stroke limit for new production runs.
Long-Stroke Assembly Pressing
Execute large-scale pressing operations over a 350 mm travel, relying on the 40 mm air cushions and the rear stopper to safely decelerate heavy loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-100 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the power for heavy actuation, but a 160 mm bore (10053 N) would be excessive. The SAIJ125X350-100 is selected specifically when a 250-350 mm travel window is required, allowing operators to fine-tune the retract end-position during setup rather than relying on a fixed-stroke SAI cylinder. Because the nominal stroke is 350 mm, an external guide is recommended to support the rod and prevent excessive side-loading on the long travel.
For a true ISO 15552 replacement match, confirm the 125 mm bore, 350 mm stroke, 100 mm adjustment range, PT port thread, and your required mounting style. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. This model uses standard carbon steel rod material and operates without a magnet. If your application requires holding the load without continuous air pressure, pair this cylinder with an external rod lock or explore the SAIL or BSAI locking series instead.
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 SAIJ125X350-100 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 its maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from the nominal 350 mm down to as little as 250 mm. This creates a 250-350 mm usable window for fine-tuning the end position without needing a different cylinder.
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