Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 90mm 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
- Stroke90 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-50S
The AirTAC SAIJ125X90-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 90 mm nominal stroke that can be dialed back by up to 50 mm, creating a precise 40 to 90 mm usable travel window for exact end-position tuning during commissioning. In the 125 mm bore class, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it well suited for heavy-duty positioning tasks.
This variant includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors, which seat neatly into the sensor grooves on both sides of the extruded aluminum barrel. The carbon steel piston rod has an M27x2 thread, and pneumatic connections use a PT tapered G1/2 port. Variable air cushions at both ends manage deceleration, while the rear mechanical stopper sets the final retract distance without acting as a load lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 90 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 SAIJ125X90-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×90 | 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 SAIJ125X90-50S Is Used
Heavy-Duty Forming Stops
Dial in the exact 40 to 90 mm retract distance for metal forming or stamping presses, allowing quick adaptation to different material thicknesses without changing the cylinder.
Product Diversion Changeover
Adjust the stroke on packaging lines to handle varying carton sizes, using the rear stopper to set precise product diversion positions on the fly.
Machine Setup Tuning
Fine-tune the end-of-travel position during initial machine commissioning to achieve perfect alignment, eliminating the need for external shims or spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-50S the Right Cylinder?
Select this 125 mm bore model when an application requires substantial thrust along with on-the-fly end-stop adjustments. If 6136 N of push force at 0.5 MPa exceeds your requirements, stepping down to a 100 mm bore yields 3927 N; conversely, moving up to a 160 mm bore provides 10053 N. The adjustable 40 to 90 mm travel window is perfect for product changeovers on a line, allowing you to fine-tune the retract distance without swapping the cylinder or adding external stops. To replace an ISO 15552 cylinder, match the 125 mm bore, 90 mm stroke, 50 mm adjustment, PT G1/2 port, and the -S magnet.
Because the stroke is 90 mm, side-load stress on the M27x2 carbon steel rod is minimal, though external guides are always recommended for heavy loads. Remember that the rear adjuster is a travel stop, not a locking device; this SAIJ cylinder will not hold a load without live air pressure. For true load-holding without continuous air, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X90-50S 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 the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster acts as a mechanical stop that allows you to shorten the 90 mm nominal stroke by up to 50 mm, creating a usable travel window of 40 to 90 mm. It only sets the end position and does not lock the load without live air pressure.
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