Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-40S 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 SAIJ125AX550-40S
The AirTAC SAIJ125X550-40-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 510 to 550 mm, allowing you to dial back the nominal stroke by up to 40 mm during machine commissioning or product changeovers. Belonging to the 125 mm bore class, it outputs 8590 N of push force and 8032 N of pull force at 0.7 MPa.
This variant integrates a SUS420J2 stainless steel rod for superior side-load durability and corrosion resistance. The extruded aluminum barrel incorporates sensor grooves on both sides, and the integrated -S magnet pairs directly with AirTAC CMSE reed and DMSE solid-state switches for precise position detection. Fluid supply is routed through PT tapered G1/2 ports.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-40S |
|---|---|
| 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 SAIJ125AX550-40S
| 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 SAIJ125AX550-40S Is Used
Heavy Press Tuning
Dial in the exact 510 to 550 mm travel window on heavy stamping presses without machining new hard stops.
Product Changeover Diverter
Adjust the retract end-position on the fly to accommodate varying package lengths on a sorting line.
Assembly Clamp Positioning
Fine-tune clamping force by precisely setting the end-of-stroke contact point during automated fixture setup.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-40S the Right Cylinder?
Select this 125 mm bore actuator when an application requires heavy thrust between 8032 N and 8590 N at 0.7 MPa; step down to a 100 mm bore (offering 5497 N push) for lighter loads, or up to a 160 mm bore (14074 N push) when massive force is needed. The adjustable stroke mechanism is ideal for variable end-stop positioning without swapping hardware, unlike a fixed-stroke SAI cylinder. Because the nominal stroke is 550 mm, an external guide is strongly recommended to prevent rod binding under high side loads.
The rear adjuster acts strictly as a travel stop and deceleration setter, meaning it will not hold a load without live air pressure. For fail-safe load holding, consider the SAIL pneumatic lock or BSAI clamp-lock series. This model is dimensionally interchangeable per ISO 15552 and uses the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
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 SAIJ125AX550-40S FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides 8590 N of push force and 8032 N of pull force. The maximum operating pressure is 1.0 MPa.
The rear adjuster screw allows you to trim the effective stroke back by up to 40 mm, creating a 510 to 550 mm usable travel window. The adjuster is a mechanical stop and does not lock the load without continuous air pressure.
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