Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-50S
The AirTAC SAIJ40X500-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 450 to 500 mm usable travel window, allowing you to dial back the nominal 500 mm stroke by up to 50 mm during commissioning. Delivering 879 N of push force at 0.7 MPa, it handles mid-range actuation tasks with precision.
This variant includes a SUS304 stainless steel rod (option B) for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel features sensor grooves on both sides, and the integrated magnet works seamlessly with AirTAC CMSE reed and DMSE electronic sensors. The rear adjuster acts purely as a travel stop for end-position tuning and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 500 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 SAIJ40BX500-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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 SAIJ40BX500-50S Is Used
Machine Changeovers
Fine-tune the 450-500 mm travel window during product size transitions without physically replacing the cylinder or bolting on external stops.
End-Position Tuning
Dial in the exact retract position at commissioning using the rear stopper screw to accommodate mechanical tolerances in the fixture.
Variable Stops on Conveyors
Adjust the stroke end-point on the fly for packaging lines handling different carton lengths, ensuring precise positioning every time.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-50S the Right Cylinder?
Choose this 40 mm bore when your application requires 879 N of push force at 0.7 MPa, offering a step up from the 32 mm bore's 563 N output. The 50 mm adjustable range is ideal for product changeovers, letting you fine-tune the end position without swapping cylinders or adding external stops. For load-holding without continuous air pressure, consider an AirTAC SAIL or BSAI cylinder instead, as the SAIJ adjuster is not a lock. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 500 mm stroke is relatively long, an external guide is recommended to manage side-load stresses on the M12x1.25 rod.
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 SAIJ40BX500-50S FAQ
At 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It operates at speeds between 30 and 800 mm/s.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from 500 mm down to 450 mm. It sets the travel end but does not lock the load without live air pressure.
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