Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-10
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-10 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 SAIJ40BX850-10
The AirTAC SAIJ40X850-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window from 840 to 850 mm without adding external stops. It delivers a robust 879 N of push force at 0.7 MPa, making it well-suited for medium-duty positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides, and the rod is constructed from SUS304 stainless steel for superior corrosion resistance.
This adjustable-stroke design is engineered for applications requiring exact end-position calibration during commissioning or product changeover. It features a G1/4 port and operates at speeds of 30-800 mm/s. The rear adjuster functions strictly as a travel stop to set deceleration, not as a lock, meaning the cylinder cannot hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-10 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-10 |
|---|---|
| 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 SAIJ40BX850-10
| 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 SAIJ40BX850-10 Is Used
Machine Changeover
Dial in the exact 840 to 850 mm end-stop during product size transitions on a packaging line without swapping out the entire cylinder assembly.
Assembly Calibration
Fine-tune the final retract position during machine commissioning to ensure precise mating of components, absorbing minor mechanical tolerances.
End-Stop Positioning
Provide a variable physical stop for diverters or gates on extended conveyor systems, allowing quick adjustments for varying product lengths.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-10 the Right Cylinder?
Choose this 40 mm bore cylinder when your setup requires precise end-position tuning within an 840-850 mm travel window, stepping up from a 32 mm bore that provides only 563 N of push force at 0.7 MPa. An adjustable stroke is preferred over a fixed SAI cylinder when you need variable end-stops for machine changeovers rather than a rigid, fixed travel. Because the stroke is 850 mm, the 16 mm diameter rod and M12x1.25 thread may still be subjected to deflection, so an external guide is recommended to manage side loads and prevent binding.
For drop-in replacements, match the 40 mm bore, 850 mm stroke, 10 mm adjustment, PT tapered port threads, and standard mounting options. The SAIJ series supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. If your application requires the cylinder to hold its position without live air, consider the SAIL or BSAI series instead, as this rear adjuster only acts as a physical stop.
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 SAIJ40BX850-10 FAQ
At an operating pressure of 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. The maximum operating pressure is 1.0 MPa.
The rear adjusting screw acts as a mechanical stop that lets you shorten the nominal 850 mm stroke by up to 10 mm, creating a usable travel window of 840 to 850 mm. It only sets the end position and does not lock or hold the load without continuous air pressure.
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