Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-30 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 SAIJ40BX300-30
The AirTAC SAIJ40X300-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 270-300 mm usable travel window. Delivering 879 N of push force at 0.7 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
Because the stroke can be dialed back by up to 30 mm, you can fine-tune the retract end position during commissioning without adding external stops. The rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure. For position holding without air, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-30 |
|---|---|
| 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 SAIJ40BX300-30
| 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 SAIJ40BX300-30 Is Used
Machine Changeover
Dial in the 270-300 mm travel window during product size changes without physically replacing the cylinder or bolting on external stoppers.
Variable End Stops
Ideal for diverter gates on conveyors where the retract position needs occasional fine-tuning to accommodate different package dimensions.
Assembly Fixtures
Provides precise end-position tuning at commissioning for automated fixtures, ensuring parts are pressed accurately without rework.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-30 the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (providing 563 N push at 0.7 MPa) is insufficient, but a 63 mm bore (2182 N) would be excessive. An adjustable stroke is ideal for product changeovers, allowing you to shift the end position by up to 30 mm on the fly rather than swapping to a fixed-stroke SAI cylinder. When replacing an ISO 15552 cylinder, match the 40 mm bore, 300 mm nominal stroke, 30 mm adjustment, PT port thread, and mounting style. Since the stroke is 300 mm, an external guide is recommended to prevent excessive side loading on the rod.
The SAIJ supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets. It operates at speeds of 30-800 mm/s and uses variable air cushions at both ends to decelerate the load.
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 SAIJ40BX300-30 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. At 0.9 MPa, the push force increases to 1130 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 30 mm, creating a 270-300 mm travel window. It functions as a mechanical stop to fine-tune the end position and does not lock the load without continuous air pressure.
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