Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20S
The AirTAC SAIJ40X50-20-S is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, engineered for applications requiring precise end-position tuning. By turning the rear screw, you can shorten the nominal 50 mm stroke by up to 20 mm, creating a flexible 30-50 mm usable travel window without adding external stops. Operating at 0.5 MPa, it provides 628 N of push force and 528 N of pull force.
This specific configuration features a SUS304 stainless steel rod for superior corrosion resistance and includes a built-in magnet (-S) that interfaces directly with AirTAC CMSE reed and DMSE solid-state sensors housed in the dual-side barrel grooves. It uses a PT tapered port (G1/4) and offers a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) compared to fixed-stroke variants.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAIJ40BX50-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SAIJ40BX50-20S Is Used
Machine Changeover
Dial in the exact 30-50 mm retract position on the fly when switching between product sizes on a packaging line, avoiding cylinder swaps.
End-Stop Calibration
Fine-tune the final end position during machine commissioning to perfect a pressing or clamping operation without external spacers.
Sensor-Ready Sorting
Leverage the integrated magnet and dual sensor grooves to mount DMSE solid-state switches for reliable position feedback in automated assembly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20S the Right Cylinder?
Choose this 40 mm bore when you need precise retract-end positioning during commissioning or product changeovers, stepping up from a 32 mm bore (402 N push at 0.5 MPa) for greater thrust. The rear adjuster acts purely as a mechanical stop to decelerate travel; it does not hold the load without live air. For fail-safe load holding, select the SAIL or BSAI series instead. To match an ISO 15552 replacement, verify the 50 mm stroke, 20 mm adjustment, PT G1/4 port, and the desired mounting bracket. The M12x1.25 rod thread handles moderate side loads, though any long unsupported stroke requires an external guide.
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 SAIJ40BX50-20S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. The operating speed range is 30-800 mm/s, driven by its G1/4 port.
The rear adjuster screw lets you mechanically shorten the 50 mm nominal stroke by up to 20 mm, providing a usable travel window of 30-50 mm. The adjuster acts as a travel stop and does not lock the load without sustained air pressure.
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