Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-20
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-20 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 SAIJ80BX850-20
The AirTAC SAIJ80X850-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 850mm travel but incorporates a 20mm adjustment screw, allowing you to dial the effective stroke back to establish a precise 830-850mm usable window. This bore size generates 2513N of push force and 2268N of pull force at 0.5 MPa, making it well-suited for heavy actuation tasks.
This specific configuration utilizes a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. Because the stroke extends to 850mm, an external guide is recommended to prevent excessive side-loading on the rod and M20x1.5 thread.
Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-20 Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-20 |
|---|---|
| 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 SAIJ80BX850-20
| 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 SAIJ80BX850-20 Is Used
Machine Setup Calibration
Dial in the exact 830-850mm end-stop during initial machine commissioning to accommodate physical variance in heavy fixtures without machining custom spacers.
Product Changeover
Quickly adjust the retract position on a packaging line when switching to different product lengths, using the rear screw to set new boundaries on the fly.
Variable End Stops
Establish precise, repeatable end-of-travel limits for heavy material handling equipment, ensuring the 2513N thrust halts at the exact required processing point.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-20 the Right Cylinder?
Select this 80mm bore cylinder when your application requires substantial thrust, such as 2513N at 0.5 MPa, but with the ability to fine-tune the end-of-stroke position at commissioning without adding external stops. If you need less force, stepping down to a 63mm bore yields 1559N; if you need more, a 100mm bore offers 3927N. The rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure—choose an AirTAC SAIL or BSAI cylinder if your application requires a physical lock. To match this ISO 15552 interchangeable cylinder, specify an 80mm bore, 850mm stroke, 20mm adjustment, PT G3/8 port, and no magnet.
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 SAIJ80BX850-20 FAQ
The rear adjuster screw allows you to shorten the effective travel by up to 20mm. This creates an adjustable 830-850mm usable stroke window, letting you fine-tune the end position at commissioning without swapping the cylinder.
At 0.5 MPa operating pressure, this 80mm bore cylinder generates 2513N of push force and 2268N of pull force. It operates at speeds between 30 and 800 mm/s.
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