Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-50S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 250mm 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
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-50S
The AirTAC SAIJ80X250-50-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a substantial 4523N of push force at 0.9 MPa, utilizing a 25mm carbon steel rod and G3/8 PT ports. The integrated -50mm adjustment mechanism creates a usable travel window of 200 to 250mm, enabling highly precise end-position tuning during commissioning without swapping out the physical barrel.
This adjustable-stroke design allows you to dial in the retract end-stop directly on the machine, which is particularly useful for product changeovers. It features sensor grooves on both sides of the extruded aluminum barrel, and the included -S magnet is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state switches for precise position feedback. The rear adjuster acts purely as a mechanical stop to set the travel end and does not function as a lock, meaning live air pressure is required to hold the load.
Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-50S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 250 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 SAIJ80X250-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×250 | 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 SAIJ80X250-50S Is Used
Machine Changeover
Rapidly reconfigure the retract distance from 200 to 250mm during product size changes without disassembling the pneumatic setup.
End-Stop Tuning
Fine-tune the final resting position at commissioning using the rear screw, eliminating the need to machine custom external spacers.
Variable Press Stroke
Adjust the effective travel window on a pressing station to accommodate different material thicknesses on the fly.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-50S the Right Cylinder?
Select this 80mm bore when an application requires high thrust (up to 4523N at 0.9 MPa) alongside flexible end-positioning. If you need slightly less force, stepping down to a 63mm bore yields 2805N of push force at 0.9 MPa. Conversely, stepping up to a 100mm bore provides 7068N. Choose this SAIJ adjustable model over a fixed-stroke SAI cylinder when your machine setup requires variable end-stops or fine-tuning at commissioning. Because the 250mm stroke exceeds the 300mm threshold, an external guide is recommended to prevent excessive side-loading on the 25mm rod thread.
For an exact ISO 15552 replacement match, verify the 80mm bore, 250mm nominal stroke, 50mm adjustment range, G3/8 PT ports, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. If your application requires true load-holding without continuous air pressure, this cylinder's adjuster will not suffice; instead, consider the SAIL lock or BSAI clamp-lock series.
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 SAIJ80X250-50S FAQ
At an operating pressure of 0.9 MPa, this 80mm bore cylinder generates 4523N of push force and 4071N of pull force. The maximum thrust is 513 kgf at 1.0 MPa.
The rear adjuster screw allows you to shorten the nominal 250mm stroke by up to 50mm, creating a usable travel window of 200 to 250mm. This stopper sets the end position but does not lock the load without live air pressure.
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