Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-40
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 185mm 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
- Stroke185 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-40
The AirTAC SAIJ80X185-40 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. By turning the external stopper screw, you can shorten the effective travel by up to 40 mm, creating a precise usable stroke window of 145 to 185 mm. This allows operators to fine-tune end positions at commissioning or during product changeover without swapping out the cylinder or adding external stops. Delivering 2513 N of push force and 2268 N of pull force at 0.5 MPa, it fits heavy-duty positioning tasks.
The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. The 25 mm carbon steel rod and M20x1.5 thread provide robust resistance to side loads, though any 185 mm travel still requires an external guide for optimal stability. The cylinder uses a PT tapered G3/8 port and operates at speeds from 30 to 800 mm/s. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on some standard ISO blocks.
Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-40 Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 185 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 SAIJ80X185-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×185 | 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 SAIJ80X185-40 Is Used
Variable End-Stop Positioning
Dial in the exact retraction point between 145 and 185 mm to accommodate different material thicknesses on a single conveyor line without changing tooling.
Machine Changeover Setup
Quickly adjust the stroke stopper during product format changes, reducing commissioning time and eliminating the need to physically swap out the entire cylinder.
Heavy-Duty Clamping
Leverage the 2513 N push force at 0.5 MPa to securely hold large workpieces, using the fine stroke adjustment to prevent over-travel and crushing.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-40 the Right Cylinder?
Selecting this 80 mm bore over a smaller 63 mm bore (which provides 1559 N push at 0.5 MPa) is driven by needing higher thrust for moving heavier fixtures or clamping larger parts. Conversely, stepping up to a 100 mm bore yields 3927 N of push force if your pneumatic system requires even greater power. The 40 mm adjustment range is ideal when you need a variable end-stop to dial in the exact final position of a part or accommodate slight variations in workpiece dimensions on the fly.
Because this is an adjustable-stroke SAIJ rather than a fixed-stroke SAI, you gain a built-in mechanical stop for setup flexibility. Remember that the rear adjuster and the variable air cushions at both ends only decelerate and set the travel end; they do not hold the load without live air pressure. For true fail-safe load holding, consider the SAIL (air-released lock) or BSAI (clamp-lock) series, or integrate an external rod lock. This model is dimensionally interchangeable per ISO 15552, requiring a bore of 80, stroke of 185, 40 mm adjustment, PT G3/8 port, and the SAIJ mounting set.
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 SAIJ80X185-40 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 the maximum pressure of 1.0 MPa, it delivers up to 4523 N of push force.
The rear adjuster screw acts as an external stopper that lets you mechanically shorten the 185 mm nominal stroke by up to 40 mm, providing a usable travel window of 145 to 185 mm. This stopper only sets the end position and must not be used as a load-holding lock.
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