Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50 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 SAIJ125X250-50
The AirTAC SAIJ125X250-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that provides a 200-250 mm usable travel window. It delivers substantial thrust, pushing 8590 N and pulling 5734 N at 0.7 MPa. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
A defining trait of this SKU is its 50 mm retract adjustment capability, which allows precise end-position tuning during commissioning without adding external stops. The carbon steel rod with an M27x2 thread handles high axial loads, while the PT tapered port ensures a tight pneumatic connection. It uses variable air cushions at both ends to decelerate heavy masses within its 30-500 mm/s operating speed range.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50 |
|---|---|
| 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 SAIJ125X250-50
| 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 SAIJ125X250-50 Is Used
Machine Changeover
Dial in the 200-250 mm retract window to accommodate new product lengths on a packaging line without physically swapping the cylinder.
Heavy Pressing Operations
Leverage the 8590 N push force at 0.7 MPa for assembling or pressing heavy components, fine-tuning the final end-stop to prevent overtravel.
Variable End-Stop Tuning
Use the 50 mm adjustment screw to set precise retract positions during initial commissioning, eliminating the need to machine custom external spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50 the Right Cylinder?
Select this 125 mm bore when an application requires heavy force—stepping down to a 100 mm bore drops the push force to 5497 N at 0.7 MPa. Choose this adjustable-stroke SAIJ over a fixed-stroke SAI when you need to dial in the exact retract end-position during machine setup or product changeover. The rear adjuster acts purely as a mechanical stop and cannot hold a load without live air pressure; for true fail-safe load holding, consider an SAIL air-released lock or BSAI clamp-lock cylinder.
This cylinder is dimensionally interchangeable per ISO 15552 mounting-interface dimensions. It supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2. Since the 250 mm stroke is below the 1500 mm maximum, it does not require external guide rods for side-load support, provided the load is axially aligned.
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 SAIJ125X250-50 FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides 8590 N of push force and 5734 N of pull force. At a maximum 1.0 MPa, it achieves up to 11045 N of push force.
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke from 250 mm down to 200 mm. This allows you to fine-tune the retract end-position during commissioning, but it does not lock the load without continuous air pressure.
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