Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-75 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 SAIJ125X250-75
The AirTAC SAIJ125X250-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a substantial 6136N pull force at 0.5 MPa, making it suited for heavy-duty handling. The integrated rear screw allows you to trim the nominal 250mm travel back by up to 75mm, creating a precise 175-250mm usable window for dialing in end positions during commissioning.
This model uses a robust 32mm carbon steel rod with an M27x2 thread, paired with 40mm variable air cushions at both ends to manage kinetic energy. The extruded aluminum barrel includes sensor grooves on both sides for fitting CMSE reed or DMSE electronic switches. It supports a speed range of 30-500mm/s and operates reliably between -20 and +70C.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-75 |
|---|---|
| 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 SAIJ125X250-75
| 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 SAIJ125X250-75 Is Used
Product Changeover
Quickly reposition the end stop within the 175-250mm window to accommodate varying package sizes on the same line.
Commissioning Tuning
Fine-tune the final end position during machine setup without fabricating or bolting on external physical stops.
Heavy Assembly
Leverage the 6136N pull force to shift heavy pallets or components while dialing in the exact seating distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-75 the Right Cylinder?
Choose this 125mm bore when a 100mm bore (providing 3927N push at 0.5MPa) lacks the thrust for your heaviest fixtures, but a 160mm bore would be physically oversized. The 75mm adjustment range is ideal for packaging lines that run multiple product sizes, allowing you to reposition the end stop rapidly without swapping the cylinder or adding external stops. For fixed-travel applications without this changeover requirement, a standard SAI cylinder is a simpler alternative.
When replacing an ISO 15552 cylinder, match the 125mm bore, 250mm stroke, PT tapered port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this variant omits FB, CA, CB, and CR mounts. Because the stroke is 250mm, ensure adequate external guiding to prevent excessive side-load on the rod. The rear adjuster and air cushions only decelerate the load; they do not hold it without live air. For fail-safe load holding, consider an external rod lock or the SAIL/BSAI series.
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 SAIJ125X250-75 FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force at 0.7 MPa. The maximum operating pressure is 1.0 MPa.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from the nominal 250mm down to 175mm. This adjuster sets the travel end and works with the air cushions for deceleration, but it does not lock or hold the load without continuous air pressure.
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