Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-50
The AirTAC SAIJ40X300-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window between 250 and 300 mm. It delivers a robust 879N of push force at 0.7MPa, making it well-suited for moderate-load automated positioning tasks.
This variant is equipped with a SUS304 stainless steel rod for superior corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting, while the adjustable stopper strictly manages end-of-travel deceleration without acting as a load lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAIJ40BX300-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SAIJ40BX300-50 Is Used
Product Changeover
Quickly adjust the 250-300mm travel window during format changes on packaging lines to accommodate varying carton sizes without changing hardware.
End-Position Tuning
Fine-tune the retract stroke during machine commissioning to achieve exact stopping positions without machining custom external spacers.
Variable Diverter
Adjust the actuation distance on the fly for sorting mechanisms that need to handle different product lengths moving down the line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-50 the Right Cylinder?
Choose this 40mm bore when you need higher thrust than the 32mm bore (which provides 563N push at 0.7MPa) but want to avoid the larger footprint of the 50mm option. The 50mm rear adjustment screw is ideal for product changeovers, letting you dial in the exact end-position at commissioning without swapping the cylinder or adding external stops. For fixed-travel applications without this tuning requirement, the standard SAI cylinder is a simpler alternative.
Because the 300mm stroke creates a long unsupported rod extension, adding an external guide rail is recommended to prevent side-load damage. Remember that the rear adjuster is a travel stop, not a lock; if your application requires true load-holding without live air pressure, consider the SAIL or BSAI cylinder series instead. This unit is dimensionally interchangeable with other ISO 15552 cylinders.
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 SAIJ40BX300-50 FAQ
At a 0.7MPa operating pressure, this 40mm bore cylinder provides 879N of push force and 528N of pull force. It can deliver up to 1130N of push force at 0.9MPa.
A rear-mounted screw stopper lets you mechanically shorten the nominal 300mm stroke by up to 50mm, providing a usable travel window of 250-300mm. This allows precise end-position tuning during setup without needing to replace the cylinder.
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