Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-75S 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 SAIJ40BX300-75S
The AirTAC SAIJ40X300-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628 N of push force at 0.5 MPa and features a 225-300 mm usable travel window, letting you trim the 300 mm nominal stroke back by up to 75 mm during commissioning. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and ships with a magnet for CMSE reed and DMSE electronic sensors. The rear stopper screw sets the retract end position without requiring external stops, though it acts only as a travel limiter and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-75S |
|---|---|
| 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 SAIJ40BX300-75S
| 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 SAIJ40BX300-75S Is Used
Product Changeovers
Dial in the 225-300 mm travel window during format size changes without physically replacing the cylinder or adding external mechanical stops.
Variable End Stops
Fine-tune the retract position on packaging conveyors to handle different carton lengths precisely at the 0.5 MPa operating pressure.
Machine Setup
Use the 75 mm rear adjustment screw to perfectly set the end-of-stroke datum during initial machine commissioning.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-75S the Right Cylinder?
Choose this 40 mm bore when you need more force than the 32 mm bore (402 N at 0.5 MPa) but want a smaller footprint than the 50 mm option (982 N). The 75 mm adjustment window is perfect for product-size changeovers on a line, allowing you to fine-tune the end position without swapping cylinders. Because the nominal stroke is 300 mm, an external guide is recommended to handle side loading on the 16 mm rod.
For an exact ISO 15552 replacement, match the 40 mm bore, 300 mm stroke, PT tapered port threads, and the -S magnet option. Remember that the rear adjuster is a stop, not a lock; for load-holding without live air, consider the SAIL or BSAI series. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ40BX300-75S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the 300 mm nominal stroke by up to 75 mm, creating a 225-300 mm usable travel window. It acts as a mechanical stop and does not lock the load without air pressure.
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