Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-20
The AirTAC SAIJ125X300-20 is a double-acting, single-rod ISO 15552 profile cylinder engineered for heavy-duty applications. It delivers 6136N of push force at 0.5 MPa and features an integrated rear adjusting screw that allows you to trim the effective stroke, providing a usable travel window of 280-300mm. This built-in adjustability eliminates the need to swap cylinders or bolt on external stops during machine commissioning.
Featuring a robust 32mm carbon steel piston rod and an M27x2 rod thread, this bore size handles significant mechanical stress. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE or DMSE switches. Operating at speeds of 30-500mm/s, it utilizes variable air cushions at both ends to decelerate the load smoothly. Note that the rear adjuster acts as a travel stop, not a lock; the cylinder requires live air to maintain its position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125X300-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125X300-20 Is Used
Product Size Changeovers
Dial in the 280-300mm travel window during format changes on packaging lines, using the rear screw to set exact end positions without swapping actuators.
Heavy Fixture Positioning
Move large welding or machining fixtures using 6136N of push force, relying on the M27x2 thread and 32mm rod to withstand substantial side loads.
Commissioning Calibration
Fine-tune the retract end-stop during initial machine setup to prevent crashes, leveraging the 20mm adjustment range to perfect the kinematic motion.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-20 the Right Cylinder?
Selecting the SAIJ125X300-20 is ideal when your assembly requires precise end-position tuning on a long-stroke, high-force actuator. If 6136N of push force at 0.5 MPa exceeds your requirements, stepping down to a 100mm bore provides 3927N, saving physical space and air consumption. Conversely, if your pull force needs are higher, the 160mm bore offers 9425N. The adjustable-stroke design is favored over a fixed SAI cylinder for product changeovers, allowing operators to dial in the 20mm adjustment window without changing mounting hardware.
Because this model features a 300mm stroke, the unsupported mass of the rod increases the risk of deflection; an external guide rail is recommended to prevent premature seal wear. This configuration uses PT tapered ports and a standard carbon steel rod without a magnet. It supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. For load-holding without continuous air pressure, consider the SAIL or BSAI series, as the SAIJ adjuster does not function as a brake.
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 SAIJ125X300-20 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 achieves a maximum push force of 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the nominal 300mm stroke by up to 20mm, creating a 280-300mm usable travel window. It is a stop only, not a lock, meaning the cylinder still requires live air to hold its position.
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