Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-50
The AirTAC SAIJ40X80-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 80 mm travel back by up to 50 mm, creating a flexible 30-80 mm usable window. Built with a SUS304 stainless steel rod and PT tapered ports, it delivers 628 N of push force at 0.5 MPa and operates at speeds up to 800 mm/s.
Instead of relying on fixed end-stops, the external rear screw lets you fine-tune the retract position directly during commissioning. This adjuster functions purely as a travel stop and works alongside the variable air cushions at both ends, but it will not hold a load without live air pressure. For position holding, consider an external rod lock or a SAIL cylinder.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX80-50 Is Used
Machine Setup Tuning
Dial in the exact retract position within the 30-80 mm window during initial commissioning without adding external stopper blocks.
Product Size Changeover
Quickly adapt the stroke end-point on the fly when running a new product size through the line, saving changeover time.
Variable End Stops
Set precise physical stops for repetitive positioning tasks, leveraging the 628 N push force to move light fixtures accurately.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-50 the Right Cylinder?
Choose this 40 mm bore when you need more thrust than the 32 mm version (402 N push at 0.5 MPa) but want a lighter frame than the 50 mm option (982 N). The 50 mm adjustment range is ideal for product changeovers on a packaging line, allowing you to dial in the exact end position without swapping the cylinder. When replacing an ISO 15552 cylinder, match the 80 mm stroke, 50 mm adjustment, PT G1/4 port, and your required mounting from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2).
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 SAIJ40 Adjustable Cylinder SAIJ40BX80-50 FAQ
At a 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw lets you shorten the 80 mm nominal stroke by up to 50 mm, providing a usable travel window between 30 and 80 mm. It acts as a physical stop for end-position tuning and is not a lock, meaning it will not hold the load without live air pressure.
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