The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X300-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø80mm bore, 300mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X300-50 is a double-acting, single-rod pneumatic cylinder that puts a 50 mm stroke-end adjustment range at your fingertips, letting you fine-tune the end position without swapping the unit. With an 80 mm bore and a 25 mm piston rod, it delivers 2513 N of push force at 0.5 MPa, scaling up to 4523 N at 0.9 MPa, making it a solid choice for medium-duty pressing, clamping, and positioning tasks where commissioning or format changes demand on-the-fly tweaks.
This adjustable-stroke model uses a rear-cap adjusting screw to shorten the nominal 300 mm stroke by up to 50 mm. The tie-rod body measures 239 mm (A dimension) and includes a 28 mm air cushion to decelerate the piston quietly. Ports are PT3/8, the rod thread is M20x1.5, and the operating range spans 0.15–1.0 MPa with filtered air. It is a genuine AirTAC component built for reliable, repeatable motion control.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X300-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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, 28 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -50 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
During machine commissioning, the 50 mm adjustment screw allows engineers to dial in the exact stroke end position without cutting brackets or adding external hard stops, speeding up line start-up.
On packaging or assembly lines running multiple product sizes, operators can quickly re-set the cylinder stroke to match a new format, minimizing changeover time and reducing the need for multiple fixed-stroke cylinders.
In clamping or pressing fixtures where tooling or pads wear over time, the adjustable stroke lets maintenance teams take up the resulting slack, maintaining consistent clamp force and part quality without replacing the actuator.
Step up to the 100 mm bore SCJ100X300-50 if your load demands more push force—the 100 bore provides 3927 N at 0.5 MPa, a significant jump from the 2513 N this 80 mm bore offers. Conversely, if space and force requirements are lower, the 63 mm bore SCJ63X300-50 delivers 1559 N push at 0.5 MPa. For applications that do not need field adjustability, the fixed-stroke SC80X300 is a simpler, more cost-effective alternative. If the rod is exposed to significant side forces during this 300 mm stroke, consider adding an external linear guide or switching to a guided cylinder to prevent rod bending and premature seal wear.
To replace an existing SCJ80X300-50, match the 80 mm bore, 300 mm nominal stroke, 50 mm adjustment range, PT3/8 port thread, and basic mounting style. If your original unit had a magnet, order the -S variant; for a trunnion or foot mount, specify the TC or LB suffix and the corresponding F-SC80TC or F-SC80LB bracket.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. The maximum push force at the 0.9 MPa operating limit is 4523 N. Because this is a single-rod cylinder, the pull force is lower due to the area of the 25 mm rod.
Yes, if you need the field-adjustable feature. The SCJ80X300-50 shares the same bore, rod, and port dimensions as the SC80X300 but includes a rear adjusting screw that can shorten the stroke by up to 50 mm. Ensure your mounting and magnet options (if any) match when ordering.
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