Airtac SAIJ80 Adjustable Cylinder SAIJ80BX650-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80BX650-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 650mm 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
- Stroke650 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80BX650-20S
The AirTAC SAIJ80X650-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 650 mm nominal stroke that can be dialed back by up to 20 mm, providing a precise 630-650 mm usable travel window for fine-tuning end positions at commissioning. In the 80 mm bore class, it delivers 2513 N of pull force at 0.5 MPa and up to 4523 N of push force at 0.9 MPa.
This variant includes a SUS304 stainless steel rod (code B) for superior corrosion resistance and carries the -S magnet option for position sensing with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure.
Airtac SAIJ80 Adjustable Cylinder SAIJ80BX650-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80BX650-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 650 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 SAIJ80BX650-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×650 | 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 SAIJ80BX650-20S Is Used
Machine Changeover
Dial in the 630-650 mm travel window during product size transitions to set new end positions quickly without physically replacing the actuator.
End-Position Tuning
Use the 20 mm rear adjuster to fine-tune the retract stroke during commissioning, perfecting the mechanical stop without adding external spacers.
Variable Stops
Adjust the retract distance on the fly for conveyor sorting mechanisms that handle different package lengths.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80BX650-20S the Right Cylinder?
Choose this 80 mm bore adjustable-stroke cylinder when your machine setup requires variable end-stops or product changeover flexibility without swapping the entire actuator. If your application needs less force, stepping down to a 63 mm bore yields 1402 N of pull force at 0.5 MPa; if you require more output, a 100 mm bore provides 3681 N of pull. Because this model features a 650 mm stroke, which exceeds 300 mm, an external guide is recommended to prevent excessive side-load wear on the rod and seals.
When specifying a replacement, match the 80 mm bore, 650 mm stroke, 20 mm adjustment range, PT tapered port, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on other series. For load-holding without live pressure, select a SAIL or BSAI cylinder instead of relying on the rear stopper.
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 SAIJ80BX650-20S FAQ
At 0.5 MPa, the 80 mm bore generates 2513 N of pull force and 2513 N of push force. At 0.9 MPa, the push force increases to 4523 N.
The rear adjuster acts as a mechanical stop that lets you shorten the 650 mm nominal stroke by up to 20 mm, creating a 630-650 mm usable travel window. It sets the end position but does not lock or hold the load without live air pressure.
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