Airtac SAIJ80 Adjustable Cylinder SAIJ80BX85-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80BX85-20S 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 SAIJ80BX85-20S
The AirTAC SAIJ80X85-20-S is a double-acting, adjustable-stroke ISO 15552 profile cylinder featuring a robust 25mm piston rod. Equipped with a rear mechanical stopper, it allows you to fine-tune the effective travel down from the 85mm nominal stroke to a 65-85mm usable window. This on-machine adjustability simplifies commissioning and product changeovers without requiring cylinder swaps. Delivering 3518N of push force at 0.7 MPa, it handles demanding actuation tasks with precision.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for position sensing. It is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state switches fitted into the dual-side sensor grooves of the extruded aluminum barrel. The PT tapered port threads (G3/8) ensure a reliable, leak-free pneumatic connection, while the integrated adjustable air cushions at both ends manage end-of-stroke kinetic energy.
Airtac SAIJ80 Adjustable Cylinder SAIJ80BX85-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80BX85-20S |
|---|---|
| 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 SAIJ80BX85-20S
| 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 SAIJ80BX85-20S Is Used
Product Changeover Dials
Quickly readjust the rear stopper by up to 20mm to accommodate varying package lengths on a packaging line without disassembling the actuator setup.
Press Fit Commissioning
Fine-tune the 65-85mm travel window during initial machine commissioning to achieve the exact insertion depth for bearing or seal press operations.
Sensor-Driven Clamping
Leverage the integrated magnet and DMSE solid-state sensors to confirm clamping positions while using the rear stopper to set the precise 80mm bore clamp depth.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80BX85-20S the Right Cylinder?
Select this 80mm bore when an application requires substantial thrust—3518N push and 2268N pull at 0.7 MPa—within a compact 85mm travel distance. If your force requirements are lower, stepping down to a 63mm bore yields 2182N of push force, whereas a 100mm bore provides 5497N for heavier loads. The 20mm rear adjuster is ideal for dialing in exact end-of-stroke positions during machine setup, offering a distinct advantage over a fixed-stroke SAI cylinder when exact tolerances must be met on the fly.
For exact ISO 15552 replacement matching, verify the 80mm bore, 85mm stroke, 20mm adjustment range, PT port threads, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting the FB, CA, CB, and CR variants. Because the stroke is under 300mm, side-load stress is minimal, though the 25mm rod still handles standard guide loads effectively. Note that the rear adjuster acts only as a travel stop; it does not hold the load without live air pressure. For true pneumatic locking, consider the SAIL or BSAI series.
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 SAIJ80BX85-20S FAQ
The rear adjusting screw acts as a mechanical stopper that allows you to shorten the effective stroke by up to 20mm. This creates a usable travel window of 65 to 85mm, letting you fine-tune the retract end position without changing the cylinder or adding external stops.
At a standard operating pressure of 0.7 MPa, the SAIJ80X85-20-S generates 3518N of push force and 2268N of pull force. It can deliver up to 4523N of push force at its maximum rated pressure of 0.9 MPa.
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