Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-75 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 SAIJ125X300-75
The AirTAC SAIJ125X300-75 is a double-acting ISO 15552 profile cylinder engineered with a rear stroke adjuster, providing a usable travel window of 225 to 300 mm. Delivering 8590 N of pull force at 0.7 MPa, it is built for heavy-duty positioning. The extruded aluminum barrel features sensor grooves on both sides for straightforward detection integration.
This unit utilizes a carbon steel piston rod and tapered PT G1/2 ports. The rear stopper screw allows precise end-position tuning at commissioning without swapping the cylinder or adding external stops. Remember that this adjuster acts only as a travel stop, not a lock, so it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-75 |
|---|---|
| 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 SAIJ125X300-75
| 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 SAIJ125X300-75 Is Used
Variable End Stops
Dial in precise retract positions from 225 to 300 mm during machine setup to accommodate varying product lengths without changing hardware.
Line Changeover
Rapidly adjust the stroke distance on packaging conveyors to handle different carton sizes on the fly, minimizing downtime between production runs.
Heavy Assembly Pressing
Leverage the 6136 N push force at 0.5 MPa to seat large components, using the rear adjuster to fine-tune the pressing depth accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-75 the Right Cylinder?
Selecting this 125 mm bore over a smaller 100 mm option steps the 0.5 MPa push force up from 3927 N to 6136 N, which is critical for high-mass actuation. The 75 mm adjustment range is ideal for product-size changeovers on a packaging line, enabling operators to dial in the exact 225 to 300 mm travel distance without mechanical rework. For holding loads safely without continuous air, consider the SAIL or BSAI series instead.
With a 300 mm stroke, the M27x2 rod thread and 32 mm rod diameter provide robust support, but an external guide is strongly recommended to prevent side-loading damage. This model is dimensionally interchangeable with ISO 15552 cylinders and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125X300-75 FAQ
At 0.7 MPa, this 125 mm bore cylinder provides 8590 N of pull force and 11045 N of push force. The maximum push force reaches 1251 kgf at 1.0 MPa.
The rear adjuster screw acts as a mechanical stop that lets you trim the effective travel back by up to 75 mm, creating a 225 to 300 mm usable window. It is a travel stop, not a lock, so it cannot hold the load without live air.
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