Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 800mm 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
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-50
The AirTAC SAIJ125X800-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 750-800mm usable travel window from its 800mm nominal stroke. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa, making it suited for moving heavy loads. The carbon steel rod has an M27x2 thread, providing a robust interface for high-thrust linkages.
This model uses a PT tapered G1/2 port and relies on 40mm air cushions at both ends to decelerate the mass. The extruded aluminum barrel includes sensor grooves on both sides for tracking position. Because the rear adjuster acts only as a travel stop, it cannot hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAIJ125X800-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SAIJ125X800-50 Is Used
Variable End Stops
Dial in the retract position by up to 50mm during product changeover to accommodate different material lengths without changing the cylinder.
Heavy Load Shifting
Leverage the 6136N push force at 0.5 MPa to move heavy pallets or chassis on an 800mm travel path, using the rear stopper to set the exact end point.
Machine Setup Tuning
Fine-tune the 750-800mm travel window at commissioning to align heavy press tools, avoiding the need to bolt on physical spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-50 the Right Cylinder?
Choose this 125mm bore when 100mm bore (3927N push at 0.5 MPa) is insufficient, but before stepping up to a 160mm bore (10053N push at 0.5 MPa). The 50mm adjustment range is ideal for machine setup and product changeover, allowing you to fine-tune the retract end position without swapping the cylinder or adding external stops. For fixed travel without a stopper, use the standard SAI cylinder.
When ordering, match the bore, 800mm stroke, 50mm adjustment, PT G1/2 port, and standard carbon steel rod. This SKU omits a magnet, so it cannot host CMSE or DMSE sensors without a -S suffix. Because the stroke is 800mm, an external guide is recommended to prevent rod side-load damage. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X800-50 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, the push force reaches 1251 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from the 800mm nominal stroke down to 750mm. This stopper only sets the end position and does not lock the load without live air pressure.
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