Airtac SAIJ80 Adjustable Cylinder SAIJ80X280-20
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80X280-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 280mm 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
- Stroke280 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80X280-20
The AirTAC SAIJ80X280-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features an 80mm bore and a 280mm nominal stroke, yielding a usable travel window of 260 to 280mm. This built-in adjustability allows you to dial in the exact retract end-position during commissioning without adding external stops or swapping the cylinder. It delivers a robust 2513N of push force at 0.5MPa and 3518N at 0.7MPa.
This model incorporates a 25mm carbon steel piston rod with an M20x1.5 thread, providing excellent rigidity and side-load resistance for heavy tooling. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE or DMSE switches. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR configurations.
Airtac SAIJ80 Adjustable Cylinder SAIJ80X280-20 Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80X280-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 280 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 SAIJ80X280-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×280 | 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 SAIJ80X280-20 Is Used
Machine Changeover
Quickly fine-tune the 260-280mm retract stop when switching between product sizes on a packaging line without changing cylinder hardware.
End-Position Calibration
Dial in the exact end-of-stroke position during machine commissioning to perfect tooling alignment and prevent over-travel damage.
Variable End Stops
Provide adjustable physical stops for heavy-duty assembly stations where the exact retraction distance needs occasional tweaking based on part variants.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80X280-20 the Right Cylinder?
Select this 80mm bore when an application requires higher thrust than a 63mm cylinder (which provides 1559N push at 0.5MPa) but does not need the full 3927N output of a 100mm bore. The adjustable stroke is ideal for product changeovers on a line, letting operators fine-tune the retract distance on the fly. Because the 280mm stroke exceeds 300mm is not the case here, but for long unsupported loads, always use an external guide to prevent rod binding. To replace an ISO 15552 cylinder, match the 80mm bore, 280mm stroke, 20mm adjustment, G3/8 PT port, and mounting style. Note that this cylinder does not include a magnet (-S), so position sensing requires a separate external sensor if needed.
The rear adjuster acts strictly as a mechanical stop to set the travel end and works alongside the standard air cushions to decelerate the load. It does not hold the load in place without live air pressure. For applications requiring true load-holding without continuous pneumatic pressure, consider the AirTAC SAIL (air-released lock) or BSAI (clamp-lock) series instead.
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 SAIJ80X280-20 FAQ
At 0.5MPa operating pressure, this 80mm bore cylinder provides 2513N of push force and 2268N of pull force. At 0.7MPa, the push force increases to 3518N.
The rear adjusting screw acts as a mechanical stop that allows you to shorten the effective stroke by up to 20mm. This creates a usable travel window of 260 to 280mm, enabling precise end-position tuning without replacing the cylinder.
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