Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-50S 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 SAIJ125X220-50S
The AirTAC SAIJ125X220-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N pull force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks. The integrated -S magnet enables precise end-of-stroke detection using AirTAC CMSE reed or DMSE solid-state sensors housed in the dual-sided barrel grooves.
This specific SKU features a 220mm nominal stroke that can be dialed back by up to 50mm, yielding a 170-220mm usable travel window. The external adjuster acts purely as a mechanical stop to fine-tune the retract end position during commissioning or product changeovers. It is not a locking device, so live air pressure is required to hold the load in place.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-50S |
|---|---|
| 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 SAIJ125X220-50S
| 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 SAIJ125X220-50S Is Used
Variable End-Stop Setup
Dial in the exact retract position within the 170-220mm window during machine commissioning to accommodate different product sizes without adding external mechanical stops.
Heavy-Duty Changeover
Leverage the 6136N pull force to shift heavy pallets or fixtures, adjusting the stroke length on the fly as production formats change.
Sensor-Driven Positioning
Utilize the built-in magnet with DMSE solid-state sensors to confirm the adjusted end-of-stroke position in automated assembly lines.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-50S the Right Cylinder?
Select this 125mm bore when your application demands high thrust—such as the 6136N pull at 0.5MPa—and requires variable end-stop positioning without swapping out the entire cylinder. If your force requirements are lower, stepping down to an 80mm bore yields 2268N pull, which might suffice for lighter loads. Conversely, moving up to a 160mm bore provides 9425N pull for heavier fixtures. The PT tapered port and carbon steel rod are standard for this bore size.
Because the stroke is 220mm (under the 300mm threshold), external side-load guides are less critical than on longer strokes, though the 32mm rod diameter handles substantial side loads inherently. The rear adjuster allows you to set the exact retract position on the fly, a major advantage over a fixed-stroke SAI cylinder when machine setups change frequently. For applications that must hold position without continuous air pressure, consider the SAIL or BSAI series instead, as the SAIJ adjuster only decelerates the travel end. This model is dimensionally interchangeable per ISO 15552.
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 SAIJ125X220-50S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force. It can safely operate up to 1.0 MPa, where the push force reaches 11045N.
The rear adjuster screw allows you to mechanically shorten the 220mm nominal stroke by up to 50mm, creating a 170-220mm usable travel window. It functions as a hard stop for end-position tuning and does not lock the load without live air pressure.
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