The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX180-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 180mm 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 SAIJ50X180-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 180 mm stroke that can be fine-tuned backward by up to 20 mm, yielding a precise 160-180 mm usable travel window. Delivering 982 N of push force at 0.5 MPa, it is built with a SUS420J2 stainless steel rod for enhanced corrosion resistance and includes a magnet for position sensing.
This adjustable-stroke design allows you to dial in the exact retract end-position during commissioning without adding external stops or swapping the cylinder. The extruded aluminum barrel features sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. It supports a standard speed range of 30-800 mm/s and uses PT tapered port threads matched to the G1/4 port size.
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX180-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 180 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. |
| ×180 | 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.
Quickly dial in the 160-180 mm retract end-position via the rear screw when switching product sizes on a packaging line, avoiding physical cylinder swaps.
Fine-tune the final resting position of a tooling head during commissioning to achieve exact contact depth without adding external mechanical stops.
Apply up to 982 N of thrust at 0.5 MPa for light-duty pressing tasks, adjusting the stroke window on the fly to accommodate different component heights.
Choose this 50 mm bore when an application requires roughly 982 N of push force at 0.5 MPa, stepping up from a 40 mm bore (628 N) or down from a 63 mm bore (1559 N). The adjustable 160-180 mm travel window is ideal for machine setups requiring variable end-stops or frequent product changeovers, offering more flexibility than a fixed-stroke SAI cylinder. To replace an ISO 15552 cylinder, match the 50 mm bore, 180 mm stroke, -20 adjustment, PT G1/4 port, and -S magnet.
Because the stroke is 180 mm, ensure proper external guiding if the load is heavy or subject to lateral forces, as the 20 mm rod diameter handles limited side-load. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider an AirTAC SAIL or BSAI cylinder. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Quick checklist
At 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. At 0.7 MPa, the push force increases to 1374 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm. This creates a 160-180 mm usable travel window for fine-tuning the end position at commissioning, but it acts as a stop and does not lock the load without live air.
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