The AirTAC Airtac JSIJ32~50 Adjustable Cylinder JSIJ50X125-40 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.
Generating around 982 N of push force at 0.5 MPa, this 50 mm bore JIS profile cylinder saves valuable machine space by being shorter than a same-bore ISO 15552 unit. The extruded hard-anodized aluminum barrel features an integrated external adjuster that lets you shorten the extend stroke on-site by up to 40 mm, yielding a usable forward travel of 85 to 125 mm while the retract end remains fixed. It handles a safe working load of roughly 589 N, which translates to lifting about 50 kg vertically with a 2:1 margin.
Fitted with a G1/4 port and an M18x1.5 rod thread, the unit delivers adjustable air cushions of 20.5 mm at each end to smooth out impacts. Because this specific SKU lacks the -S magnet option, it cannot accept CMSE or DMSE sensors for position detection. Note that the adjustable stop sets the end position but does not lock the load; you will need an external rod lock or pilot-operated check valve to hold a load securely against air loss.
| Model | Airtac JSIJ32~50 Adjustable Cylinder JSIJ50X125-40 |
|---|---|
| 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.
Dial in the exact clamping contact point on varying part heights by shortening the 125 mm extend stroke up to 40 mm on the fly without changing the cylinder mount.
Adjust the reach of a sorting gate arm on-site to handle different package widths, using the external stop screw to set the precise extended dwell position.
Stock one 125 mm unit as a universal replacement for shorter 85 to 125 mm actuators, turning the adjuster down to match the required machine travel.
When sizing this actuator, stepping down to a 40 mm bore drops the 0.5 MPa push force to 628 N, while stepping up to a 63 mm bore raises it to 1559 N. The 50 mm bore sits perfectly in the middle for medium-duty tasks. The 40 mm adjustable window is ideal for sharing a single spare cylinder across multiple stroke variants or fine-tuning the final end position on-site without swapping the whole body. You can mount it using basic, FA, LB, TC, TCM1, or TCM2 brackets. For any stroke length at or above 300 mm, always use a external guide rail to prevent side-load damage to the piston rod.
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 piston rod.
The nominal maximum extend stroke is 125 mm. An external adjuster screw lets you shorten the forward stroke on-site by up to 40 mm, giving a usable extend range of 85 to 125 mm. The retract end position is fixed. This mechanism only sets the end-of-stroke position and does not lock the load.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
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