Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-100 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 SAIJ125AX550-100
The AirTAC SAIJ125X550-100 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a substantial 6136N thrust at 0.5 MPa and incorporates a SUS420J2 stainless steel rod for enhanced durability against lateral stress. The extruded aluminum barrel includes dual sensor grooves for straightforward position feedback.
With a 550mm nominal stroke and a 100mm adjustment range, this model yields a versatile 450-550mm usable travel window. This built-in stopper allows operators to fine-tune the retract end-position during commissioning or product changeovers without adding external stops. The rear adjuster acts strictly as a travel stop to set deceleration, not as a lock to hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-100 |
|---|---|
| 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 SAIJ125AX550-100
| 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 SAIJ125AX550-100 Is Used
Product Size Changeovers
Dial in the 450-550mm travel window during production line changeovers to accommodate varying package lengths without swapping out the entire cylinder assembly.
Heavy Pressing Assembly
Leverage the 6136N thrust at 0.5 MPa for heavy-duty pressing and joining tasks, using the rear stopper to precisely set the final end-position.
Machine Commissioning
Fine-tune the retract end-position during initial machine setup, using the 100mm adjustment range to dial in the exact required stroke without external spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-100 the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder's 2513N push force at 0.5 MPa is insufficient for heavy actuation. The adjustable stroke is ideal for production lines requiring frequent product-size changeovers, providing a variable end-stop instead of a fixed SAI cylinder. To replace an ISO 15552 unit, match the 125mm bore, 550mm stroke, 100mm adjustment, PT tapered port threads, and the Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting set.
Because the 550mm stroke is substantial, the 32mm rod diameter and M27x2 thread provide rigidity, but an external guide is still recommended to manage side loads. Furthermore, this plain SAIJ cylinder does not hold its position without live air; for fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder instead.
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 SAIJ125AX550-100 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it delivers 1251 kgf of push force.
The rear adjuster acts as an external stopper, allowing you to shorten the 550mm nominal stroke by up to 100mm. This creates a 450-550mm usable travel window for fine-tuning end positions without replacing the cylinder.
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