Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-30 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 SAIJ125X800-30
The AirTAC SAIJ125X800-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 800 mm travel by up to 30 mm. This creates a usable 770-800 mm end-position window, enabling precise retract tuning during commissioning without swapping hardware. Built with an extruded aluminum barrel, it delivers 6136 N of pull force at 0.5 MPa and reaches speeds of 30-500 mm/s.
The 32 mm carbon steel piston rod utilizes an M27x2 thread, providing substantial rigidity for heavy loads. It features variable air cushions at both ends to absorb kinetic energy, but note the rear mechanical stopper only trims travel distance—it will not hold a load without live air pressure. For position holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-30 |
|---|---|
| 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 SAIJ125X800-30
| 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 SAIJ125X800-30 Is Used
Variable End-Stop Machining
Dial in the 770-800 mm retract position to fine-tune heavy press strokes during part setup without adding external mechanical stops.
Product Changeover Lines
Adjust the retract distance on the fly to handle varying package sizes on a high-thrust conveyor divergence system.
Heavy Assembly Jigs
Utilize the 6136 N pull force to secure large components, tweaking the end position to account for jig tolerance variations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-30 the Right Cylinder?
When selecting this 125 mm bore over the 100 mm version (3927 N push at 0.5 MPa), you gain significant thrust for heavy-duty operations, pushing up to 8590 N at 0.7 MPa. Choose this adjustable-stroke model over a fixed SAI when a machine setup requires variable retract end-stops to accommodate product changeovers.
Because the 800 mm stroke is substantial, the long unsupported rod is susceptible to deflection under side loads; an external guide rail is recommended to prevent premature seal wear. To replace an ISO 15552 cylinder, match the 125 mm bore, 800 mm stroke, PT tapered port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, 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 SAIJ125X800-30 FAQ
At 0.5 MPa, it provides 6136 N of pull force and 8590 N at 0.7 MPa. The maximum operating thrust is 11045 N at 0.9 MPa.
The rear adjuster acts as a mechanical stop that trims the 800 mm stroke back by up to 30 mm, creating a 770-800 mm usable travel window for exact end-position tuning.
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