The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX125-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 125mm 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.
The AirTAC SAIJ50X125-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 982N of push force and 825N of pull force at 0.5 MPa, with a nominal 125mm stroke that can be fine-tuned backward by up to 50mm. This yields a highly flexible usable travel window of 75-125mm, enabling precise end-position tuning at commissioning without swapping out the physical cylinder.
Built with a SUS420J2 stainless steel rod (code A) and PT tapered ports, this unit is designed for rigorous industrial use. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting. It supports AirTAC CMSE reed and DMSE electronic sensors when a magnet is specified, and relies on variable air cushions at both ends to decelerate the load smoothly.
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX125-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
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. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | 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 exact end-position for different product sizes on a packaging line using the 75-125mm travel window without adding external stops.
Fine-tune the retract end-position during initial commissioning to perfect sensor alignment and mechanical timing.
Adjust the stroke on the fly for testing different material lengths or feed distances before locking in the final mechanical travel.
Choose this 50mm bore adjustable-stroke cylinder when your application requires variable end-stops for product-size changeovers on a line, rather than a fixed-stroke SAI model. If your setup demands less force, stepping down to a 40mm bore provides 628N of push force at 0.5 MPa; conversely, moving up to a 63mm bore yields 1559N. Remember that the rear adjuster acts purely as a travel stop and does not hold the load without live air pressure. For fail-safe load holding without continuous air, consider an AirTAC SAIL or BSAI clamping cylinder.
When replacing an ISO 15552 cylinder, match the 50mm bore, 125mm nominal stroke, 50mm adjustment range, PT G1/4 port, and the required mounting set. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, deliberately omitting FB, CA, CB, and CR accessories. Because the 125mm stroke is under 300mm, side-load risks are moderate, but the 20mm rod diameter still requires external guiding for heavy lateral loads.
Quick checklist
At 0.5 MPa operating pressure, this 50mm bore cylinder provides 982N of push force and 825N of pull force. It can reach up to 1767N of push force at 0.9 MPa.
The SAIJ50X125-50 has a nominal stroke of 125mm with a rear adjuster that allows you to trim the stroke back by up to 50mm. This creates an adjustable travel window of 75-125mm for fine-tuning the end position without replacing the cylinder.
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