Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75
The AirTAC SAIJ125X500-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 425-500mm usable travel window, allowing you to trim the effective stroke by up to 75mm during commissioning without swapping the cylinder or adding external stops. Built with an extruded aluminum barrel, it delivers 6136N push and 5734N pull force at 0.5 MPa.
This 125mm bore model uses a G1/2 port and a 32mm carbon steel rod with an M27x2 thread. It operates at speeds of 30-500mm/s and includes variable air cushions at both ends. The rear adjuster acts purely as a travel stop for end-position tuning and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125X500-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125X500-75 Is Used
Product Size Changeovers
Dial in the 425-500mm travel window on the fly to accommodate different product lengths on the same production line without mechanical rebuilds.
Commissioning End-Stop Tuning
Fine-tune the exact retracted position during machine setup using the rear screw, avoiding the need to bolt on external stops or swap cylinders.
Heavy Material Handling
Leverage the 6136N push force at 0.5 MPa to move heavy pallets or fixtures, relying on the 32mm carbon steel rod for robust actuation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75 the Right Cylinder?
Choose this 125mm bore if your application requires heavy thrust between the 80mm bore (2513N push at 0.5 MPa) and the 160mm bore (10053N push at 0.5 MPa). The adjustable 425-500mm window is ideal for product changeovers on a line where exact retracted positions vary. For a fixed end-stop without the need for commissioning fine-tuning, a standard SAI cylinder is sufficient.
Because this is a 500mm stroke, the 32mm rod and M27x2 thread still require an external guide to handle side loads on long unsupported travels. To replace an ISO 15552 cylinder, match the 125mm bore, 500mm stroke, PT tapered port, and mounting choice from Basic, FA, LB, TC, FTC, TCM1, or TCM2. If you need to hold the load without live air, use a SAIL or BSAI lock cylinder instead of relying on this adjuster.
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 SAIJ125X500-75 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster allows you to shorten the nominal 500mm stroke by up to 75mm, creating a 425-500mm usable travel window. It functions as a mechanical stop for end-position tuning and does not hold the load without live air pressure.
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