Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-20S 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 SAIJ80BX850-20S
The AirTAC SAIJ80X850-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 830 to 850 mm. Delivering 4523 N of push force at 0.9 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and features a built-in magnet for position sensing.
This model utilizes PT tapered port threads (G3/8) and includes variable air cushions at both ends to manage kinetic energy. The rear stopper mechanism allows precise end-position tuning during commissioning without adding external stops, while the extruded aluminum barrel maintains a standard ISO 15552 mounting footprint.
Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-20S |
|---|---|
| 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 SAIJ80BX850-20S
| 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 SAIJ80BX850-20S Is Used
Variable End-Stop Tuning
Fine-tune the retraction point within the 830-850 mm window during machine commissioning to achieve precise material positioning without machining external stoppers.
Product Size Changeover
Quickly adapt extended-reach conveyor diverters or pushing mechanisms to handle different product lengths on the fly by dialing the rear adjustment screw.
Extended Reach Pushing
Leverage the 4523 N push force at 0.9 MPa over a long 850 mm stroke to move heavy workpieces, relying on the SUS304 rod for durability in industrial environments.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-20S the Right Cylinder?
Selecting this 80 mm bore cylinder makes sense when your application requires the 2513 N push force available at 0.5 MPa, stepping up from a 63 mm bore that yields 1559 N. The adjustable 830-850 mm travel window is ideal for dialing in exact end positions during machine setup or product changeovers, avoiding the need to physically swap out a fixed-stroke SAI cylinder. Because the stroke is 850 mm, an external guide is strongly recommended to prevent excessive side-loading on the rod.
For an exact ISO 15552 replacement, match the 80 mm bore, 850 mm stroke, 20 mm adjustment range, PT port thread, and -S magnet requirement. Note that the rear adjuster acts strictly as a travel stop and does not hold the load without live air; for true pneumatic locking, consider the SAIL or BSAI series. This SKU supports the Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounting styles.
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 SAIJ80BX850-20S FAQ
At 0.5 MPa, this 80 mm bore cylinder provides 2513 N of push force and 2268 N of pull force. At 0.9 MPa, the push force increases to 4523 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm, creating a usable travel window of 830 to 850 mm. It functions as a mechanical stop for end-position tuning and is not a locking device.
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