Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-20S 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 SAIJ40BX800-20S
The AirTAC SAIJ40X800-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a 780 to 800 mm usable travel window for precise end-position tuning. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it well suited for moderate-load positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides, and the -S magnet directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for exact end-of-stroke detection.
This variant features a SUS304 stainless steel rod (option B) for superior corrosion resistance and uses a PT tapered port thread. The rear adjuster acts strictly as a travel stop to dial in the exact retract position during commissioning without adding external stops; it is not a lock and will not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-20S |
|---|---|
| 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 SAIJ40BX800-20S
| 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 SAIJ40BX800-20S Is Used
Variable End-Stop Positioning
Ideal for conveyor sorting lines where the retract position needs a 780-800 mm fine-tune window to accommodate different package sizes without changing hardware.
Machine Changeover Calibration
Enables rapid adjustment of the retract end-stop during product family transitions, cutting setup time by dialing the stroke back up to 20 mm.
Corrosion-Resistant Actuation
The SUS304 stainless steel rod provides the durability needed in packaging or light-washdown environments requiring precise 628 N force output.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-20S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (offering 402 N push at 0.5 MPa) lacks the necessary thrust, but a 50 mm bore (982 N push) would be excessive. The adjustable stroke is ideal for machine setups requiring variable end-stops or fine-tuning during product changeover, whereas a fixed SAI cylinder locks you into a single dimension. Because the 800 mm stroke is long and unsupported, an external guide rail is recommended to prevent rod side-loading and premature wear. To match this ISO 15552 cylinder, verify the 40 mm bore, 800 mm base stroke, 20 mm adjustment range, PT G1/4 port, and the -S magnet requirement.
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 SAIJ40BX800-20S FAQ
At 0.5 MPa it provides 628 N push and 528 N pull force, with a maximum thrust of 1130 N at 0.9 MPa. The operating speed range is 30-800 mm/s.
The rear adjuster lets you shorten the effective stroke by up to 20 mm, creating a 780-800 mm travel window. It functions as a mechanical stop for end-position tuning, not a lock, so it cannot hold a load without air pressure.
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