Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75 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 SAIJ125AX550-75
The AirTAC SAIJ125X550-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 475-550 mm usable travel window, allowing you to dial back the nominal 550 mm stroke by up to 75 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it is built with a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and features PT tapered port threads (G1/2).
This model includes variable air cushions at both ends to decelerate heavy loads smoothly. The extruded aluminum barrel integrates sensor grooves on two sides for CMSE reed and DMSE electronic switches. It supports a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75 |
|---|---|
| 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 SAIJ125AX550-75
| 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 SAIJ125AX550-75 Is Used
Product Changeover
Dial in the 475-550 mm travel window during format changes without physically replacing the cylinder or repositioning hard stops.
Heavy Pressing
Leverage 6136 N of thrust at 0.5 MPa for pressing or forming tasks, using the rear screw to fine-tune the exact end-position.
Machine Setup
Perfect for commissioning long-stroke automated machinery where the final retracted position needs precise mechanical tuning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75 the Right Cylinder?
Choose this 125 mm bore when 80 mm (2513 N at 0.5 MPa) lacks the thrust for moving substantial masses, but stepping up to 160 mm (10053 N) would be overkill. The 75 mm adjustment range is perfect for product changeovers on a line, letting you set new end positions without swapping cylinders or adding external stops. For any 550 mm stroke, an external guide is strongly recommended to prevent side-load damage to the rod and M27x2 thread.
Verify your ISO 15552 replacement matches these specs: 125 mm bore, 550 mm stroke, 75 mm adjuster, PT G1/2 port, and no -S magnet. Remember that the rear adjuster acts only as a travel stop, not a lock; the SAIJ does not hold loads without live air. For dead-pilot load holding, consider the SAIL or BSAI series 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 SAIJ125AX550-75 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 1251 kgf.
The rear adjuster acts as an external stopper, allowing you to shorten the effective stroke from 550 mm down to 475 mm. It sets the travel end and relies on the air cushion for deceleration, but it does not lock the load without live air pressure.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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