Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-75S 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 SAIJ125AX220-75S
The AirTAC SAIJ125X220-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 220 mm stroke that can be dialed back by up to 75 mm, giving you a usable travel window of 145 to 220 mm to fine-tune end positions at commissioning. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa.
This variant features a SUS420J2 stainless steel rod (code A) for improved corrosion resistance and includes a magnet for CMSE reed and DMSE solid-state sensors. The extruded aluminum barrel design integrates sensor grooves on both sides, and the PT tapered port threads match the G1/2 specification for this bore size.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-75S |
|---|---|
| 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 SAIJ125AX220-75S
| 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 SAIJ125AX220-75S Is Used
Machine Changeover
Dial in the 145-220 mm travel window during product size changeovers to set new end positions without replacing the cylinder.
End-Stop Tuning
Fine-tune the retract position at commissioning using the rear screw, avoiding the need to bolt on external mechanical stops.
Heavy Assembly Press
Leverage the 6136 N push force at 0.5 MPa for heavy-duty assembly operations while adjusting the stroke to accommodate varying part heights.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-75S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) is insufficient, but a 160 mm bore (10053 N at 0.5 MPa) would be oversized. The 75 mm adjustment range is ideal for machinery requiring significant product-size changeovers, allowing you to shift the end-stop without swapping the cylinder or adding external stops. Because the stroke is 220 mm, ensure external guides support the load to prevent excessive side-loading on the rod.
Remember that the rear adjuster acts only as a travel stop to decelerate the load alongside the air cushions, not as a locking device. This SAIJ cylinder will not hold its position without live air pressure; for true load-holding without continuous pressure, consider an AirTAC SAIL or BSAI cylinder. For ISO 15552 interchangeability, match the 125 mm bore, 220 mm stroke, 75 mm adjustment, PT G1/2 port, and Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounts.
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 SAIJ125AX220-75S FAQ
The rear adjuster screw acts as a stopper that lets you shorten the effective stroke by up to 75 mm. This creates a usable travel window of 145 to 220 mm, allowing you to fine-tune the retract end position without changing the cylinder.
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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