Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-100S
The AirTAC SAIJ125X550-100-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N push force at 0.5MPa and uses a 32mm SUS420J2 stainless steel rod with an M27x2 thread. The built-in magnet enables position detection with AirTAC CMSE reed and DMSE electronic sensors.
This model provides a 450-550mm usable travel window by allowing up to 100mm of stroke reduction via the rear stopper. It operates at 30-500mm/s and includes adjustable air cushions at both ends. The extruded aluminum barrel has sensor grooves on both sides for flexible switch mounting.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125AX550-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125AX550-100S Is Used
Variable End-Stop Tuning
Dial in the exact 450-550mm end position during machine setup to accommodate varying product lengths without adding external mechanical stops.
Product Size Changeover
Quickly adjust the stroke by up to 100mm on packaging lines when switching between different package dimensions, ensuring precise positioning.
Heavy-Duty Assembly Press
Leverage the 6136N thrust at 0.5MPa for clamping and pressing operations while using the rear screw to fine-tune the pressing depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-100S the Right Cylinder?
Choose this 125mm bore when 100mm bore's 3927N push at 0.5MPa is insufficient, or step up to 160mm bore for 10053N if your load demands it. The adjustable stroke is ideal for fine-tuning end positions during machine commissioning or product changeovers without swapping cylinders. With a 550mm stroke, use an external guide to prevent rod sag and side-load damage.
The rear adjuster acts strictly as a travel stop and does not hold the load without live air. For load-holding without pneumatic pressure, use an AirTAC SAIL pneumatic lock, BSAI clamp-lock cylinder, or an external rod lock. This cylinder is dimensionally interchangeable per ISO 15552 and uses a PT tapered port thread.
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 SAIJ125AX550-100S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear stopper screw allows you to shorten the 550mm nominal stroke by up to 100mm, creating a 450-550mm adjustable travel window. This adjuster is a mechanical stop only and does not lock the load without live air pressure.
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