Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-20 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 SAIJ40BX850-20
The AirTAC SAIJ40X850-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window down to 830-850 mm without adding external stops. Delivering 628 N of push force at 0.5 MPa, it is equipped with a SUS304 stainless steel rod for superior corrosion resistance in demanding environments.
Unlike a fixed-stroke SAI cylinder, this model uses an external rear screw to set the retract end-position precisely during commissioning. The adjustment mechanism acts purely as a travel stop to decelerate the load, so it cannot hold position without live air pressure. For load-holding without continuous air, an external rod lock or related SAIL and BSAI series should be specified.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-20 |
|---|---|
| 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 SAIJ40BX850-20
| 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 SAIJ40BX850-20 Is Used
Machine Changeover
Dial in the exact 830-850 mm end-stop during product size transitions without physically replacing the cylinder or adding external mechanical stops.
Corrosive Assembly
Leverage the SUS304 stainless steel rod for push operations in washdown or corrosive manufacturing environments requiring precise travel limits.
Long-Stroke Conveying
Actuate long-travel diverters on a production line, using the rear adjuster to synchronize end positions across multiple stations.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-20 the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires 628 N of push force at 0.5 MPa, or step up to a 50 mm bore if your setup demands 982 N. The adjustable stroke is ideal for product changeovers, letting operators dial in the exact end-stop without swapping the cylinder. This SKU uses a PT tapered G1/4 port and supports the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Because the 850 mm stroke is long, an external guide is strongly recommended to prevent side-loading damage to the rod. This configuration features a SUS304 stainless steel rod, a standard carbon steel barrel with dual sensor grooves, and no internal magnet. If position sensing is required, select a magnet-equipped variant for use with CMSE reed or DMSE electronic sensors.
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 SAIJ40BX850-20 FAQ
The rear adjuster screw lets you shorten the nominal 850 mm stroke by up to 20 mm, providing a usable travel window of 830-850 mm. It functions as a travel stop for end-position tuning and does not lock the load without live air pressure.
At 0.5 MPa, the 40 mm bore provides 628 N of push force and 528 N of pull force. The standard speed range for this bore size is 30-800 mm/s, and the cylinder operates safely between 0.15 and 1.0 MPa.
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