Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-75S
The AirTAC SAIJ125X250-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa (8590N at 0.7MPa) and features a 250mm nominal stroke that can be dialed back by up to 75mm, yielding a precise usable travel window of 175-250mm. This wide adjustment band is ideal for accommodating multiple product sizes on a single line without physically swapping the actuator.
This variant includes a magnet for position sensing with CMSE reed and DMSE electronic switches, which seat neatly into the sensor grooves on both sides of the extruded aluminum barrel. It uses a PT tapered port thread and a carbon steel rod. The rear adjuster functions strictly as a travel stop for end-position tuning, not a lock, so load holding without live air requires a SAIL or BSAI variant.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125X250-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125X250-75S Is Used
Product Size Changeovers
Leverage the 175-250mm travel window to switch between different product lengths on a packaging line without physically replacing the actuator or adding external spacers.
Heavy Fixture Positioning
Use the 6136N thrust at 0.5MPa to move heavy machining fixtures into place, relying on the rear screw to fine-tune the exact clamping endpoint at commissioning.
Variable End-Stop Diverging
Divert heavy pallets on a conveyor by adjusting the stroke in real-time to match varying pallet widths, using the DMSE electronic sensors to confirm the modified end position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-75S the Right Cylinder?
Select this 125mm bore when a 100mm cylinder (3927N push at 0.5MPa) lacks thrust or an 80mm bore (2513N) is undersized for heavy positioning tasks. The 75mm adjustment range is significantly larger than smaller codes, making it the preferred choice where downstream tooling or product lengths vary dramatically, eliminating the need for external mechanical stops during changeover. Because the 250mm stroke exceeds 300mm? No, at 250mm it is under the 300mm threshold, but always ensure the M27x2 rod is adequately supported to prevent side-load wear on the seals.
To match this ISO 15552 cylinder for a retrofit, verify the 125mm bore, 250mm stroke, 75mm adjustment, PT port thread, and the -S magnet option. Mounting is limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, CR). The standard speed range for this bore is 30-500mm/s.
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 SAIJ125X250-75S FAQ
At 0.5MPa, it provides 6136N of push force and 5734N of pull force. If you increase the operating pressure to 0.7MPa, the push force rises to 8590N.
The rear adjuster acts as a mechanical stop, allowing you to shorten the 250mm nominal stroke by up to 75mm. This creates a usable travel window of 175-250mm for fine-tuning the end position without swapping the cylinder.
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