The AirTAC SAIJ40 Adjustable Cylinder SAIJ40AX280-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 280mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
The AirTAC SAIJ40X280-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 250-280 mm usable travel window by allowing you to dial back the 280 mm nominal stroke by up to 30 mm.
This adjustable-stop design lets you fine-tune end positions at commissioning or during product changeovers without swapping the cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting, and the unit supports a speed range of 30-800 mm/s with variable air cushions at both ends to decelerate the load.
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40AX280-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 280 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.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 528 N | 528 N |
| 0.7 MPa | 739 N | — |
| Max (@1.0 MPa) | 108 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×280 | 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.
Dial in the 250-280 mm retract position during product size changes without replacing the cylinder or adding external mechanical stops.
Fine-tune the exact end-of-stroke location during commissioning to compensate for mechanical tolerance variations in the fixture.
Adjust the retract distance on the fly to handle different package sizes on a conveyor line, ensuring precise positioning.
If you need less force, step down to the 32 mm bore offering 402 N; for higher loads, step up to the 50 mm bore providing 982 N. The 30 mm adjustment range is perfect for variable end-stop setups, giving you a 250-280 mm window to dial in the exact retract position.
For an exact ISO 15552 replacement, match the 40 mm bore, 280 mm stroke, PT G1/4 ports, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting set. Because the 280 mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the rod. Remember that the rear adjuster is a travel stop, not a lock; the cylinder will not hold a load without live air pressure, so consider a SAIL or BSAI cylinder if load-holding is required.
Quick checklist
At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as a mechanical stop that shortens the effective travel. For the SAIJ40X280-30, you can trim the 280 mm nominal stroke back by up to 30 mm, creating a 250-280 mm usable travel window. Note that this is a travel stop, not a lock, and the cylinder requires live air to hold its position.
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