Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-50S 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 SAIJ40BX300-50S
The AirTAC SAIJ40X300-50-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 628N of push force at 0.5 MPa and provides a usable travel window of 250 to 300 mm, allowing you to dial back the nominal 300 mm stroke by up to 50 mm during machine commissioning.
This variant includes a SUS304 stainless steel rod (option B) for corrosion resistance and comes standard with a magnet for CMSE reed and DMSE electronic sensors. It uses a PT G1/4 port and dual-side sensor grooves on the extruded aluminum barrel, while omitting the FB, CA, CB, and CR mounting interfaces found on some standard cylinders.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-50S |
|---|---|
| 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 SAIJ40BX300-50S
| 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 SAIJ40BX300-50S Is Used
Machine Changeover
Quickly fine-tune the 250-300 mm travel window during product size transitions without replacing the cylinder or bolting on external stopper blocks.
Variable End Stops
Ideal for diverter arms on conveyors where the exact retraction end-point must be adjusted on the fly to handle varying package dimensions.
Commissioning Calibration
Allows engineers to safely trim the 300 mm stroke back by up to 50 mm to perfect timing and avoid mechanical crashes during initial setup.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-50S the Right Cylinder?
Choose this 40 mm bore when an application requires moderate thrust, such as the 528N pull force at 0.5 MPa, but needs flexible end-position tuning without swapping cylinders or adding external stops. If your setup requires higher force, stepping up to the 50 mm bore yields 982N push force at 0.5 MPa. Because the stroke is 300 mm, an external guide is recommended to prevent excessive side-loading on the 16 mm rod.
The rear adjuster acts purely as a travel stop for end-position deceleration and does not hold the load without live air pressure. For drop-prevention or load-holding requirements, select an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead. This SAIJ model is dimensionally interchangeable per ISO 15552 and accepts PT tapered port threading.
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 SAIJ40BX300-50S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628N of push force and 528N of pull force. It operates at speeds between 30 and 800 mm/s and uses a G1/4 port.
The rear adjuster screw lets you shorten the effective travel from the 300 mm nominal stroke down to 250 mm. This stopper only sets the end position; it does not lock or hold the load without continuous air pressure.
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