Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-75 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 SAIJ40BX850-75
The AirTAC SAIJ40X850-75 is a double-acting, single-rod ISO 15552 profile cylinder engineered with a rear stroke adjuster. It provides a nominal 850 mm stroke that can be fine-tuned down by up to 75 mm, yielding a usable travel window of 775 to 850 mm. Delivering 628 N of push force at 0.5 MPa, it fits medium-duty applications perfectly.
This configuration features a SUS304 stainless steel rod for superior corrosion resistance and uses a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides. Because the rear adjuster acts strictly as a travel stop and the air cushions handle deceleration, neither will hold a load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-75 |
|---|---|
| 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 SAIJ40BX850-75
| 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 SAIJ40BX850-75 Is Used
Machine Changeover
Dial in the 775-850 mm travel window during product size changes without physically replacing the actuator or bolting on external stopper blocks.
Sorting Diverter
Provides 628 N of push force at 0.5 MPa to deflect packages, with the rear screw allowing precise end-position tuning for varying parcel dimensions.
Long-Stroke Assembly
Handles extended 850 mm reach operations while the SUS304 rod withstands humid or washdown manufacturing environments without rusting.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-75 the Right Cylinder?
Select this 40 mm bore when you need 628 N push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) if your load demands more thrust, or down from a 50 mm bore (982 N) to save space. The 75 mm adjustment window is ideal for product changeovers, allowing you to reposition the end stop during commissioning without swapping the cylinder or adding external stops. For load-holding without live air, consider an external rod lock or the AirTAC SAIL series.
To replace an ISO 15552 cylinder, match the 40 mm bore, 850 mm stroke, 75 mm adjustment, PT port, and your required mounting hardware. Note that SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR. Since the 850 mm stroke is long, the 16 mm rod requires an external guide to prevent excessive side-loading and premature seal wear.
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 SAIJ40BX850-75 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from 850 mm down to 775 mm. It only sets the travel end and does not lock the load without live air pressure.
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