Airtac SAIJ80 Adjustable Cylinder SAIJ80AX650-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80AX650-20S 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 SAIJ80AX650-20S
The AirTAC SAIJ80X650-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 2513N push force at 0.5 MPa and features a 650mm nominal stroke that can be fine-tuned down by 20mm, yielding a usable travel window of 630-650mm. The integrated magnet (-S) supports precise position sensing via AirTAC CMSE reed or DMSE solid-state switches.
This unit features a SUS420J2 stainless steel rod (option A) for superior corrosion resistance and uses PT tapered port threads (G3/8). The extruded aluminum barrel includes sensor grooves on both sides. Because the 650mm stroke is long, the 25mm rod diameter should be paired with an external guide to prevent excessive side-loading and premature seal wear.
Airtac SAIJ80 Adjustable Cylinder SAIJ80AX650-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80AX650-20S |
|---|---|
| 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 SAIJ80AX650-20S
| 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 SAIJ80AX650-20S Is Used
Variable End-Stop Tuning
Dial in the exact 630-650mm travel distance during commissioning to perfectly strike a workpiece without machining custom spacer blocks.
Product Line Changeover
Quickly shorten the cylinder stroke by up to 20mm when switching a conveyor line to process a slightly smaller product format.
Long-Stroke Forming
Leverage the 2513N push force and 650mm travel for deep-draw pressing operations that require gentle end-position cushioning.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX650-20S the Right Cylinder?
Choose this 80mm bore when you need higher thrust than the 63mm option (which provides 1559N push at 0.5 MPa) but want to avoid the larger footprint and 3927N force of the 100mm bore. The adjustable stroke is ideal for machine setups requiring variable end-stops during product changeovers, eliminating the need to physically swap cylinders or bolt on external hard stops. For exact ISO 15552 interchangeability, match the 80mm bore, 650mm stroke, 20mm adjustment, PT G3/8 ports, and the -S magnet requirement.
Remember that the rear adjuster functions strictly as a travel stop to decelerate the load, not as a locking device. The cylinder cannot hold its position without live air pressure. If your application requires true fail-safe load holding, consider the AirTAC SAIL pneumatic lock or BSAI clamp-lock series instead. The SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR brackets found on some other ISO cylinders.
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 SAIJ80AX650-20S FAQ
At a 0.5 MPa operating pressure, this 80mm bore cylinder produces 2513N of push force and 2268N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 513 kgf.
A rear external screw acts as a stopper, allowing you to shorten the 650mm nominal stroke by up to 20mm. This creates a usable travel window of 630-650mm, enabling fine-tuning of the end position without replacing the cylinder.
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