Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-75S
The AirTAC SAIJ40X850-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window from 775 to 850 mm. Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, it is equipped with a SUS304 stainless steel rod for superior corrosion resistance. The integrated magnet enables position sensing with AirTAC CMSE reed and DMSE electronic switches.
This adjustable model eliminates the need to swap cylinders or bolt on external stops during product changeovers. The rear adjuster acts purely as a travel stop to set the end position and deceleration point, meaning it cannot hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 850 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 SAIJ40BX850-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×850 | 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 SAIJ40BX850-75S Is Used
Product Changeover Lines
Dial in the end-stop from 775 to 850 mm during packaging format changes without physically swapping the actuator.
Variable Position Diverters
Fine-tune the retract distance on a sorting gate to handle varying package sizes on the fly.
Adjustable Pressing Stations
Set the exact 775 to 850 mm travel window for applying labels or components to different product heights.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-75S the Right Cylinder?
Choose this 40 mm bore cylinder when your application requires 628 N of thrust at 0.5 MPa and a highly flexible end-of-stroke position within a 775 to 850 mm window. If your setup demands less force, stepping down to a 32 mm bore yields 402 N of push force. The PT tapered port threads ensure a robust, leak-free connection, while the -S magnet supports precise end-position feedback via CMSE or DMSE sensors.
Because this configuration features an 850 mm stroke, the 16 mm rod and M12x1.25 rod thread require careful alignment to manage side loads; always use an external guide rail to prevent rod binding. When replacing an ISO 15552 cylinder, match the 40 mm bore, 850 mm stroke, 75 mm adjustment range, PT port, and the desired mounting option from the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, or 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 SAIJ40BX850-75S FAQ
The rear adjuster screw lets you mechanically shorten the retract stroke by up to 75 mm, providing a usable travel window of 775 to 850 mm. This allows precise end-position tuning at commissioning without adding external stops.
At 0.5 MPa operating pressure, it generates 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, the push force increases to 1130 N.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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