Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-50 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 SAIJ125AX220-50
The AirTAC SAIJ125X220-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136 N pull force at 0.5 MPa. It features a 220 mm nominal stroke that can be dialed back by up to 50 mm, creating a precise 170-220 mm usable travel window for product changeovers. This model utilizes a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and PT tapered port threads.
Because the rear screw acts purely as a travel stop and not a lock, it cannot hold a load without live air pressure. The extruded aluminum barrel includes sensor grooves on both sides, allowing the direct mounting of position switches. Note that this SAIJ configuration uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting the FB, CA, CB, and CR brackets found on some other series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-50 |
|---|---|
| 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 SAIJ125AX220-50
| 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 SAIJ125AX220-50 Is Used
Variable End-Stop Forming
Dial in the exact retract distance for multi-depth forming operations, using the 50 mm adjustment window to accommodate different material thicknesses on the fly.
Product Size Changeover
Rapidly reconfigure a packaging line for new carton dimensions by turning the rear stopper screw, eliminating the need to unbolt and replace the actuator.
Commissioning Fine-Tuning
Trim the effective travel back from 220 mm to 170 mm during machine setup to perfectly synchronize the heavy-duty 125 mm bore motion with downstream equipment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-50 the Right Cylinder?
Choose this 125 mm bore when you need substantial thrust—such as the 6136 N pull force at 0.5 MPa—or step down to a 100 mm bore (offering 3681 N pull) if your payload is lighter. An adjustable stroke is selected over a fixed SAI cylinder when you need to fine-tune the retract end position at commissioning or adapt end-stops for varying product sizes without physically swapping the actuator. For any load-holding requirements without continuous air pressure, this cylinder is insufficient as the adjuster is only a stop; you should instead look at the SAIL or BSAI locking series, or employ an external pilot-operated check valve. Since the 220 mm stroke is below the 300 mm threshold, side-load stress is moderate, but the 32 mm rod diameter still handles lateral forces well when paired with an external guide.
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 SAIJ125AX220-50 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 6136 N of push force. If pressure is increased to 0.7 MPa, the output force scales up to 8590 N.
The rear adjusting screw acts as a mechanical stop that shortens the effective travel. For this SAIJ125X220-50, the 220 mm stroke can be trimmed back by up to 50 mm, resulting in a usable travel window of 170 to 220 mm.
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