Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 270mm 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
- Stroke270 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-20S
The AirTAC SAIJ80X270-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 2513 N push force at 0.5 MPa, making it suited for heavy-duty positioning tasks. The integrated -S magnet enables position detection with AirTAC CMSE reed or DMSE electronic solid-state sensors housed in the dual-side barrel grooves.
This model features a 270 mm nominal stroke that can be fine-tuned down by up to 20 mm, creating a usable travel window of 250 to 270 mm. This built-in adjuster allows you to dial in the retract end-position during commissioning without adding external stops. The 25 mm carbon steel rod and M20x1.5 thread provide excellent side-load resistance, while the PT tapered ports ensure a tight pneumatic seal.
Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 270 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 SAIJ80X270-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×270 | 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 SAIJ80X270-20S Is Used
Product Changeover
Quickly fine-tune the 250-270 mm retract distance on packaging lines when switching to different box sizes, avoiding mechanical rebuilds.
Machine Setup
Dial in the exact end-position during initial commissioning to perfectly time heavy 2513 N press operations without external stopper blocks.
Variable End Stops
Adjust the stroke window on the fly for diverter gates handling varied pallet dimensions, ensuring precise routing without replacing the actuator.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-20S the Right Cylinder?
Choose this 80 mm bore when a 50 mm bore (982 N push at 0.5 MPa) lacks the thrust for your payload, but a 100 mm bore (3927 N) would be excessive overkill. The adjustable stroke is ideal for machine setups requiring variable end-stops during product changeovers, eliminating the need to swap out a fixed-stroke SAI cylinder. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Because the 270 mm stroke creates a long lever arm, an external guide is recommended to prevent rod binding under heavy lateral loads. Remember that the rear adjuster acts only as a travel stop, not a lock; the SAIJ80X270-20-S will not hold its load without live air. For pilot-operated load holding, consider an AirTAC SAIL or BSAI cylinder. This SKU is dimensionally interchangeable per ISO 15552, uses PT ports, and includes the -S 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 SAIJ80X270-20S FAQ
At 0.5 MPa operating pressure, this 80 mm bore cylinder provides 2513 N of push force and 2268 N of pull force. At 0.7 MPa, the push force increases to 3518 N.
The rear adjuster screw lets you shorten the 270 mm nominal stroke by up to 20 mm, providing a usable travel window of 250 to 270 mm. This stopper only sets the end position and does not lock the load without live air pressure.
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