Airtac SAIJ80 Adjustable Cylinder SAIJ80AX85-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80AX85-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 85mm 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
- Stroke85 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX85-20S
The AirTAC SAIJ80X85-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 85 mm stroke that can be dialed back by up to 20 mm, yielding a precise 65-85 mm usable travel window for fine-tuning end positions at commissioning. Delivering 2513 N of push force at 0.5 MPa, it handles substantial loads while allowing rapid product changeovers without swapping hardware.
This variant features a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel integrates sensor grooves on both sides, and the G3/8 PT tapered ports ensure high flow for its 30-800 mm/s speed range.
Airtac SAIJ80 Adjustable Cylinder SAIJ80AX85-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80AX85-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 85 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 SAIJ80AX85-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×85 | 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 SAIJ80AX85-20S Is Used
End-Position Tuning
Dial in the exact 65-85 mm travel window during machine commissioning to perfect pressing or clamping depth without machining new spacers.
Product Changeover
Quickly adapt the stroke end-stop on packaging lines when switching to different carton sizes or product widths.
Variable Assembly Stops
Set precise retraction points for robotic pick-and-place assemblies where multiple end positions are required from a single actuator.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX85-20S the Right Cylinder?
Selecting this 80 mm bore makes sense when your application requires the 2513 N push force (at 0.5 MPa) or 3518 N at 0.7 MPa, but demands on-the-fly end-position tuning rather than a fixed stop. If you need less force, stepping down to a 63 mm bore yields 1559 N at 0.5 MPa; if you need more, a 100 mm bore provides 3927 N. Because the stroke is under 300 mm, side-load risks are moderate, but the M20x1.5 rod thread still requires external guiding for heavy lateral loads.
Choose the adjustable SAIJ over a fixed SAI cylinder when machine setups involve varying product sizes or require precise end-stop tuning without adding external stops. Remember that the rear adjuster acts only as a travel stop, not a lock; the SAIJ does not hold loads without live air. For true load-holding, consider the SAIL or BSAI series. To match this ISO 15552 footprint, specify an 80 mm bore, 85 mm stroke, 20 mm adjustment, G3/8 PT ports, SUS420J2 rod, and a magnet for CMSE/DMSE switches. Mounting options include 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 SAIJ80 Adjustable Cylinder SAIJ80AX85-20S FAQ
At 0.5 MPa operating pressure, this 80 mm bore cylinder provides 2513 N of push force and 2268 N of pull force. At 0.7 MPa, the push force increases to 3518 N.
The rear adjusting screw acts as a mechanical stop that allows you to shorten the 85 mm nominal stroke by up to 20 mm. This creates a usable travel window of 65-85 mm, enabling fine-tuning of the retract end position without replacing the cylinder.
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