Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-50S 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 SAIJ40BX850-50S
The AirTAC SAIJ40X850-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel by up to 50 mm. This creates an 800-850 mm usable end-position window, allowing precise end-stop tuning at commissioning without adding external stops. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, matching the standard SAI force class for its 40 mm bore.
This made-to-order configuration uses a SUS304 stainless steel rod for corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel provides dual sensor grooves. Because the 850 mm stroke is long, the 16 mm rod and M12x1.25 thread should be paired with an external guide to prevent side-load damage.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-50S |
|---|---|
| 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 SAIJ40BX850-50S
| 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 SAIJ40BX850-50S Is Used
End-Position Tuning
Dial in the exact 800-850 mm retract distance during machine setup without physically swapping out the entire actuator.
Product Changeover
Quickly adjust the stroke stop by up to 50 mm to accommodate varying package sizes on a packaging line.
Sensor-Ready Automation
Leverage the built-in magnet for CMSE and DMSE switches to confirm end-of-travel positions in control systems.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-50S the Right Cylinder?
Choose this 40 mm bore when you need 628 N push force at 0.5 MPa and a variable end-stop; step down to a 32 mm bore for 402 N if your load is lighter, or up to a 50 mm bore for 982 N if you need more thrust. The 50 mm adjustment range is ideal for product-size changeovers on a line, letting you fine-tune the retract position without swapping the cylinder. SAIJ mounting options are Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles.
The rear adjuster acts as a travel stop to set deceleration, but it does not hold the load without live air. For load-holding without pneumatic pressure, use an external rod lock or pilot-operated check valve, or select the SAIL or BSAI series. This SAIJ40X850-50-S is dimensionally interchangeable per ISO 15552, uses a PT tapered port, and is fully sensor-ready.
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 SAIJ40BX850-50S FAQ
At 0.5 MPa it provides 628 N push force and 528 N pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the 850 mm nominal stroke by up to 50 mm, creating an 800-850 mm travel window. It acts as a mechanical stop and does not lock the load.
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