The AirTAC Airtac JSIJ32~50 Adjustable Cylinder JSIJ50X125-20 is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø50mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. Its no-tie-rod, hard-anodized profile barrel is more compact than an ISO 15552 cylinder of the same bore — a space-saver on tight machines.
Delivering 982 N of push force at 0.5 MPa, this 50 mm bore JIS profile cylinder is built for applications needing precise end-position tuning. The external stop screw lets you shorten the extend stroke on-site by up to 20 mm, yielding a usable extend range of 105-125 mm without swapping the actuator. Its extruded hard-anodized aluminum barrel is noticeably shorter and more compact than a same-bore ISO 15552 unit, saving valuable machine space.
Featuring a G1/4 port and an M18x1.5 rod thread, the unit handles a safe working load of about 589 N, which translates to lifting roughly 50 kg vertically with a 2:1 margin. Note that this specific SKU lacks a magnet, so it cannot accept CMSE/DMSE sensors; order the -S variant if you require position detection. Furthermore, the adjustable air cushions only decelerate the piston near the stroke ends and do not hold the load on air loss, so fit an external rod lock or pilot-operated check valve for suspended loads.
| Model | Airtac JSIJ32~50 Adjustable Cylinder JSIJ50X125-20 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 125 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | G1/4 |
| Rod thread | M18×1.5 |
| 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, 20.5 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC JSI (JIS standard) datasheet. Confirm against the product label before installation. Thread options: PT (blank) / G. Barrel: hard-anodized aluminum profile (no tie rods).
| 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.
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 50 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×125 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSE / DMSE sensors. |
JSI-family variants: JSI (double acting), JSID (double rod), JSIJ (adjustable stroke). Mounting: LB / FA / FB / CA / CB / CR / TC / TCM1 / TCM2. Thread PT (blank) / G.
Ideal for machining fixtures where the 20 mm extend adjuster dials in the exact clamping position on parts of varying thickness without remounting the cylinder.
Perfect for packaging lines that need to push seals or labels into boxes of different depths, using the adjustable window to prevent crushing the contents.
Suits conveyor diverters where the extend endpoint must be fine-tuned on-site to match product widths, ensuring smooth lateral transfers without re-engineering the frame.
When sizing this actuator, compare it against the neighbouring 40 mm bore (628 N push at 0.5 MPa) and the 63 mm bore (1559 N push at 0.5 MPa) to ensure you have the right force margin. The 20 mm adjustable window is particularly useful when you want a shared spare across slightly different stroke variants or need fine end-position tuning on-site. Mounting options include Basic, FA, LB, TC, TCM1, and TCM2 brackets. Because the 125 mm stroke is relatively short, side-load stress is minimal, but for any stroke over 300 mm you should guide the load to prevent rod bending. Remember that this non-magnetic model cannot support sensors.
Quick checklist
At 0.5 MPa it provides 982 N push and 825 N pull. At 0.7 MPa it provides 1374 N push and 1154 N pull. The theoretical maximum force is 200 kgf at 1.0 MPa. This 50 mm bore model uses a G1/4 air port and features a 20 mm adjustable air cushion at each end.
An external stop screw lets you shorten the extend stroke on-site by up to 20 mm. The nominal 125 mm stroke is the maximum, giving a usable extend range of 105-125 mm, while the retract end remains fixed. This mechanism sets the end position and does not lock the load.
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