Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 800mm 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
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50
The AirTAC SAIJ40X800-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to fine-tune the travel end without swapping hardware. By dialing the external stopper, you achieve a usable travel window of 750-800 mm, making it ideal for product changeovers. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This specific configuration features a SUS304 stainless steel rod (option B) for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this non-magnetized unit requires adding an -S suffix to host CMSE reed or DMSE electronic sensors. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 800 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 SAIJ40BX800-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×800 | 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 SAIJ40BX800-50 Is Used
Machine Changeover
Dial in the 750-800 mm travel window during product size transitions to set exact end-stops without physically swapping cylinders or adding external shims.
End-Position Tuning
Fine-tune the retract stroke at commissioning to absorb mechanical tolerances and achieve precise seating of components on long-stroke assemblies.
Variable Stops
Adjust the travel end on the fly for packaging lines that process varying box lengths, using the rear stopper to set the exact 750-800 mm dimension.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50 the Right Cylinder?
Choose this 40 mm bore when an application requires more thrust than the 32 mm variant (402 N at 0.5 MPa) but lacks the space or need for the 50 mm bore (982 N at 0.5 MPa). The adjustable stroke is selected over a fixed SAI model when precise end-position tuning is necessary at commissioning or when accommodating varying product sizes on a single line.
Because the nominal stroke is 800 mm, an external guide is strongly recommended to prevent excessive side-loading on the piston rod. For load-holding without continuous air pressure, note that this cylinder's adjuster is only a stop, so you must integrate an external rod lock or pilot-operated check valve. To match this ISO 15552 interchangeable cylinder exactly, specify a 40 mm bore, 800 mm stroke, 50 mm adjustment, PT port threads, SUS304 rod material, and no 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 SAIJ40 Adjustable Cylinder SAIJ40BX800-50 FAQ
At an operating pressure of 0.5 MPa, 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 acts as an external stopper that lets you shorten the effective travel from the nominal 800 mm down to 750 mm. It functions as a travel stop to set the end position, but it does not lock or hold the load without live air pressure.
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