Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-100S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-100S 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 SAIJ40BX300-100S
The AirTAC SAIJ40X300-100-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 300 mm travel that can be dialed back by up to 100 mm, giving you a 200-300 mm usable stroke window for precise end-position tuning. Delivering 879 N of pull force at 0.7 MPa, it handles mid-range actuation tasks with ease.
This variant is equipped with a SUS304 stainless steel rod for superior corrosion resistance and includes a piston magnet for position sensing. It supports AirTAC CMSE reed and DMSE solid-state electronic sensors in the dual-side barrel grooves. The G1/4 port and M12x1.25 rod thread ensure robust pneumatic and mechanical connections.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-100S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-100S |
|---|---|
| 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 SAIJ40BX300-100S
| 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 SAIJ40BX300-100S Is Used
Product Size Changeovers
Dial in the exact 200-300 mm travel needed for different product lengths on a packaging line without changing cylinders or adding external mechanical stops.
Machine Setup Commissioning
Fine-tune the retract end-position during initial commissioning to perfect the timing and alignment of a 40 mm bore assembly mechanism.
Variable Diverter Stroke
Adjust the stroke length on the fly for a conveyor sorting diverter that needs to push varying package sizes to different lanes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-100S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (345 N pull at 0.5 MPa) lacks the force for your load, but a 50 mm bore (825 N pull at 0.5 MPa) is physically oversized. The adjustable 200-300 mm window is perfect for machines requiring variable end-stops during product changeovers, eliminating the need to physically swap cylinders or bolt on external stoppers. For a fixed-stop application without the adjustment hardware, the standard SAI cylinder is a simpler alternative.
Because the stroke is 300 mm, the M12x1.25 rod will experience higher bending moments under side loads; an external guide rail is highly recommended to prevent premature seal wear. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure. For true fail-safe load holding, consider the SAIL or BSAI series. This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. It uses PT tapered ports.
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 SAIJ40BX300-100S FAQ
The rear adjusting screw acts as a mechanical stopper that limits the retract stroke. For this model, you can trim the effective travel back by up to 100 mm, providing a usable stroke window of 200 to 300 mm. The adjuster sets the travel end but does not lock or hold the load without continuous air pressure.
At a standard 0.5 MPa operating pressure, it generates 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
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