Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-20 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 SAIJ40BX800-20
The AirTAC SAIJ40X800-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down by 20 mm, creating a precise 780-800 mm usable window. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it well-suited for long-travel positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
This specific configuration features a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The rear adjustment screw functions strictly as a mechanical stop to set the end position during commissioning without requiring external stops; it does not lock the load, so live air pressure must be maintained to hold position.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-20 |
|---|---|
| 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 SAIJ40BX800-20
| 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 SAIJ40BX800-20 Is Used
Variable End-Stop Tuning
Dial in the exact 780 to 800 mm travel distance during machine commissioning to accommodate different product lengths without swapping cylinders.
Product Changeover Systems
Quickly adjust the retract position on packaging lines when switching between different package sizes, ensuring precise stops on the fly.
Long-Travel Positioning
Utilize the 800 mm stroke for extended linear movements while relying on the rear stopper to fine-tune the final end-position accurately.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-20 the Right Cylinder?
Choose this 40 mm bore when your application requires less thrust than the 50 mm bore (982 N at 0.5 MPa) but more than the 32 mm option (402 N). An adjustable stroke is ideal for machine setups requiring variable end-stops or product changeovers, whereas a fixed SAI cylinder is preferred for dedicated, unchanging travel distances. Because the stroke is 800 mm, the 16 mm rod and M12x1.25 thread still require an external guide to prevent excessive side-loading on the extended rod.
This model is dimensionally interchangeable per ISO 15552 mounting-interface dimensions. It supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). For load-holding without live air pressure, consider the SAIL or BSAI series instead.
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 SAIJ40BX800-20 FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder provides a push force of 628 N and a pull force of 528 N. At the maximum 1.0 MPa, it delivers 128 kgf.
The rear adjuster acts as a mechanical stop that lets you trim the nominal 800 mm stroke back by up to 20 mm, providing a usable travel window of 780 to 800 mm. It only sets the end position and does not hold the load without live air pressure.
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