Airtac SAIJ80 Adjustable Cylinder SAIJ80AX850-20
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80AX850-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 850mm stroke, G3/8 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ80 mm
- Stroke850 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX850-20
The AirTAC SAIJ80X850-20 is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical stroke adjuster. It delivers a robust 4523N of push force at 0.9 MPa, utilizing a 25mm piston rod with an M20x1.5 thread. By turning the rear adjusting screw, you can trim the effective travel back by up to 20 mm, creating a precise 830-850 mm usable stroke window for exact end-position tuning during commissioning.
This unit features a SUS420J2 stainless steel rod for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU is configured without a magnet. The rear adjuster functions purely as a travel stop to set deceleration and end limits, meaning it will not hold a load without live air pressure.
Airtac SAIJ80 Adjustable Cylinder SAIJ80AX850-20 Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80AX850-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 850 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 36 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ80 Adjustable Cylinder SAIJ80AX850-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×850 | 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 SAIJ80 Adjustable Cylinder SAIJ80AX850-20 Is Used
Machine Changeover
Dial in the 830-850mm travel window during product size transitions to set new end positions without re-mounting hardware.
End-Position Tuning
Fine-tune the exact retract stop during commissioning to perfect timing on automated assembly lines.
Variable Stops
Adjust the physical rear stopper to accommodate different package sizes on a material handling line.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX850-20 the Right Cylinder?
Choose this adjustable-stroke model when a machine setup requires variable end-stops or frequent product changeovers without physically swapping the cylinder or adding external bumpers. If your application needs less force, stepping down to a 63mm bore yields 2805N of push force at 0.9 MPa; if you need more holding power, the 100mm bore provides 7068N. For this 850mm stroke, the long unsupported travel requires an external guide to prevent excessive rod side-loading, as the 25mm rod alone cannot support cantilevered loads. To replace an ISO 15552 cylinder, match the 80mm bore, 850mm stroke, 20mm adjustment, PT ports, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting set.
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 SAIJ80 Adjustable Cylinder SAIJ80AX850-20 FAQ
The rear adjuster acts as a mechanical stopper that lets you shorten the nominal 850mm stroke by up to 20mm, providing a usable travel window of 830-850mm. It sets the end position and deceleration point but does not lock or hold the load without continuous air pressure.
At an operating pressure of 0.9 MPa, the SAIJ80X850-20 generates 4523N of push force and 4061N of pull force. It operates at speeds between 30 and 800 mm/s.
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