Airtac SAIJ80 Adjustable Cylinder SAIJ80X155-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80X155-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 155mm 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
- Stroke155 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80X155-20S
The AirTAC SAIJ80X155-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 2513N push force at 0.5 MPa. By turning the external stopper screw, you can trim the effective travel within a 135-155 mm window, enabling precise end-position tuning at commissioning without swapping out the entire actuator. This bore features a 25mm carbon steel piston rod and M20x1.5 rod thread, providing substantial rigidity against side loads.
This variant includes a magnetic piston (-S) for position sensing and uses PT tapered ports (G3/8). It retains the standard extruded aluminum barrel with sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic switches. The rear adjuster acts purely as a travel stop to set deceleration, meaning it will not hold a load without continuous live air pressure.
Airtac SAIJ80 Adjustable Cylinder SAIJ80X155-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80X155-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 155 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 SAIJ80X155-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×155 | 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 SAIJ80X155-20S Is Used
End-Stop Calibration
Dial in the exact 135-155 mm end position during machine commissioning to perfect product seating without adding external hard stops.
Product Changeover
Quickly adjust the rear screw to accommodate different package sizes on a packaging line, minimizing downtime between production runs.
High-Force Clamping
Leverage the 2513N push force at 0.5 MPa to securely clamp heavy workpieces, using the adjuster to prevent over-travel on delicate parts.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80X155-20S the Right Cylinder?
Select this 80mm bore when an application demands high thrust—stepping up from a 63mm bore increases push force from 1559N to 2513N at 0.5 MPa, while dropping to a 50mm bore lowers it to 982N. The adjustable stroke is ideal for machine setups requiring variable end stops or product-size changeovers, whereas a fixed SAI cylinder suits fixed-pitch operations. To replace an ISO 15552 cylinder, match the 80mm bore, 155mm stroke, 20mm adjustment, G3/8 PT ports, and the -S magnet requirement.
Although the 155mm stroke is below the 300mm threshold where external guides become strictly necessary, the 25mm rod still handles moderate side loads well. For applications requiring true load-holding without live air, this cylinder is insufficient; consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
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 SAIJ80X155-20S FAQ
At 0.5 MPa operating pressure, this 80mm bore cylinder provides 2513N of push force and 2268N of pull force. At 0.9 MPa, the push force increases to 4523N.
The rear adjuster screw allows you to shorten the nominal 155mm stroke by up to 20mm, creating a usable travel window of 135-155mm. It functions as a mechanical stop for end-position tuning and does not lock the load without air pressure.
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