Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-50S 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 SAIJ125AX250-50S
The AirTAC SAIJ125X250-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 200 to 250 mm. It delivers a robust 6136 N push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This unit features a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. The external stopper allows fine end-position tuning at commissioning without swapping hardware, while the extruded aluminum barrel integrates sensor grooves on both sides for flexible switch mounting.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-50S |
|---|---|
| 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 SAIJ125AX250-50S
| 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 SAIJ125AX250-50S Is Used
Product Changeover
Dial in the 200-250 mm travel window during packaging format changes to accommodate different carton sizes without replacing the cylinder.
Heavy Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy jigs or platens into exact final positions on a machining line.
Machine Commissioning
Fine-tune the retract end-position during initial setup to avoid mechanical hard stops and perfect the timing of automated assembly equipment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-50S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust—stepping down to an 80 mm bore yields 2513 N at 0.5 MPa, whereas this model provides 6136 N. The 50 mm adjustment range is ideal for production lines needing variable end-stops during product changeovers, replacing the need for fixed-stroke SAI cylinders.
As an ISO 15552 dimensionally interchangeable profile cylinder, it accepts PT tapered port threads and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mountings. Note that the rear adjuster and air cushions act only as travel stops; for true load-holding without live air pressure, an external rod lock or a SAIL/BSAI cylinder is required.
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 SAIJ125AX250-50S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder produces 6136 N of push force and 5734 N of pull force. It can achieve up to 11045 N push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the nominal 250 mm stroke by up to 50 mm, creating a usable travel window of 200 to 250 mm. This stopper only sets the end position; it does not lock the load without live air pressure.
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Standard models usually ship in 3-4 days.
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