Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-50 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 SAIJ40BX850-50
The AirTAC SAIJ40X850-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 800 to 850 mm, allowing you to dial back the nominal 850 mm stroke by up to 50 mm during commissioning. This 40 mm bore generates 628 N of push force at 0.5 MPa and uses a G1/4 port.
Equipped with a SUS304 stainless steel rod, this unit is built for environments where corrosion resistance is critical. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. It carries a 30 mm adjustable air cushion at both ends to manage kinetic energy, and the PT tapered port thread ensures a tight, reliable pneumatic connection.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-50 |
|---|---|
| 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 SAIJ40BX850-50
| 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 SAIJ40BX850-50 Is Used
Product Changeover
Dial in the 800-850 mm travel window on the fly to accommodate different part lengths on a single assembly line without changing the cylinder.
Commissioning Tuning
Fine-tune the exact end-of-stroke position during machine setup to align tooling perfectly, eliminating the need for external mechanical stops.
Corrosive Environments
Leverage the SUS304 stainless steel rod for reliable actuation in washdown or corrosive manufacturing areas where standard carbon steel rods fail.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-50 the Right Cylinder?
Choose this specific 40 mm bore when your application requires 628 N of push force at 0.5 MPa. If your load demands less force, stepping down to a 32 mm bore yields 402 N; stepping up to a 50 mm bore provides 982 N. The 50 mm rear adjustment screw is selected over a fixed-stroke SAI cylinder when you need variable end-stops for product size changeovers without physically swapping the cylinder or adding external stops.
Because the 850 mm stroke is substantial, an external guide is recommended to prevent excessive side-loading on the rod. Remember that the rear adjuster acts only as a travel stop and the air cushions manage deceleration; neither will hold the load without live air pressure. For true load-holding, consider the SAIL or BSAI series. This model is dimensionally interchangeable per ISO 15552, uses PT port threads, and omits FB, CA, CB, and CR mounting options.
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 SAIJ40BX850-50 FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw lets you shorten the effective stroke from the nominal 850 mm down to 800 mm. This creates an 800-850 mm travel window for precise end-position tuning without replacing the cylinder.
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