Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-40S 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 SAIJ40BX800-40S
The AirTAC SAIJ40X800-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 800 mm stroke that can be fine-tuned backward by up to 40 mm, creating a precise 760-800 mm usable travel window. Delivering 879 N of push force at 0.7 MPa, it is built with a SUS304 stainless steel rod and includes a magnet for position sensing.
This model features PT tapered port threads and operates at speeds between 30-800 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to mount CMSE reed or DMSE electronic switches directly along the body. The rear adjuster acts purely as a mechanical stop to set the end position, meaning it will not hold a load safely without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-40S |
|---|---|
| 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 SAIJ40BX800-40S
| 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 SAIJ40BX800-40S Is Used
Machine Changeover
Dial in the 760-800 mm travel window during product size changes to set new end positions rapidly without disassembling the actuator assembly.
Variable End Stops
Ideal for diverter gates on long conveyors where the exact retract position needs occasional mechanical tuning to accommodate varying package dimensions.
Commissioning Fine-Tune
Perfect for synchronizing long-stroke tooling strokes at startup, letting technicians trim the final 40 mm of travel mechanically rather than reprogramming the PLC.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-40S the Right Cylinder?
Choose this adjustable SAIJ variant when your machine setup requires commissioning fine-tuning or variable end-stops without physically swapping cylinders or adding external stops. If you need less force, stepping down to a 32 mm bore yields 563 N at 0.7 MPa; stepping up to a 50 mm bore provides 1374 N. Because this cylinder features an 800 mm stroke, the 16 mm rod requires external guiding to prevent excessive side-loading and premature seal wear over that long unsupported distance.
For a direct ISO 15552 replacement match, verify a 40 mm bore, 800 mm stroke, 40 mm adjustment range, PT port threads, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, intentionally omitting FB, CA, CB, and CR brackets. If your application requires true load-holding without live air pressure, look to the SAIL pneumatic lock or BSAI clamp-lock series instead of relying on the rear adjuster.
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 SAIJ40BX800-40S FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it achieves a push force of 1130 N.
The rear mechanical adjuster allows you to shorten the effective stroke by up to 40 mm from the nominal 800 mm, providing a usable travel window of 760 to 800 mm. This stopper only sets the end position and does not function as a lock to hold the load without air pressure.
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