Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-50S
The AirTAC SAIJ40X550-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that creates a 500-550 mm usable travel window. It delivers 879 N of push force and 528 N of pull force at 0.7 MPa, making it well-suited for moderate actuation tasks. The stainless steel SUS304 piston rod provides excellent corrosion resistance for demanding environments.
Equipped with a magnet for position sensing, this unit supports AirTAC CMSE reed and DMSE electronic solid-state switches housed in the dual-side barrel grooves. The rear stopper mechanism allows precise end-position tuning during commissioning without adding external physical stops, though it functions purely as a travel limiter and does not lock the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 550 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 SAIJ40BX550-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×550 | 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 SAIJ40BX550-50S Is Used
Machine Setup Tuning
Dial in the exact 500-550 mm end-position during initial commissioning without swapping out the entire actuator or fabricating external shims.
Product Size Changeover
Quickly modify the retract stop distance on a packaging line to accommodate varying package lengths on the fly.
Variable End-Stop Actuation
Utilize the 50 mm adjustment window to fine-tune the stroke limit on automated assembly equipment requiring precise physical positioning.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-50S the Right Cylinder?
Select this 40 mm bore actuator when an application requires a 500-550 mm stroke range and approximately 879 N of force at 0.7 MPa. If your project requires greater thrust, stepping up to the 50 mm bore yields 1374 N of push force. Conversely, downsizing to a 32 mm bore drops the output to 563 N. The adjustable stroke is chosen over a fixed SAI cylinder when you need variable end-stops for product changeovers or exact setup tuning.
Because the 550 mm stroke is relatively long, the 16 mm diameter rod and M12x1.25 thread still require an external guide to prevent excessive side-loading on the unsupported piston. To replace an ISO 15552 cylinder, verify the 40 mm bore, 550 mm stroke, 50 mm adjustment, PT tapered port thread, and the -S magnet requirement. For load-holding without continuous air pressure, consider the SAIL or BSAI series, as this adjuster only decelerates and sets the travel end.
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 SAIJ40BX550-50S FAQ
At 0.7 MPa, this 40 mm bore cylinder generates 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster acts as a mechanical stop that allows you to trim the effective travel back by up to 50 mm from the 550 mm nominal stroke, creating a 500-550 mm usable window. It is a travel limiter, not a lock, and will not hold the load without live air pressure.
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