The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X250-50 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, 250mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X250-50 is an 80 mm bore double-acting, single-rod pneumatic cylinder that delivers a robust 2513 N of push force at 0.5 MPa, making it a strong candidate for medium-duty clamping, pressing, and positioning tasks. Its defining feature is the rear-cap adjusting screw, which provides a 50 mm field-adjustable stroke range, allowing operators to fine-tune the stroke end position from the nominal 250 mm down to 200 mm without removing the cylinder from the machine.
Built on a durable tie-rod design with a 25 mm diameter piston rod and a 28 mm air cushion for smooth end-of-stroke deceleration, this cylinder is designed for reliable service in filtered-air systems up to 1.0 MPa. The body length (A dimension) is 239 mm, and the standard PT3/8 ports make it a direct fit for common pneumatic circuits. This model is configured with a basic mount, a standard TPU seal, and no magnet.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X250-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 250 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. |
| ×250 | 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 range lets technicians dial in the exact stop position for a material pusher or diverter gate without fabricating custom hard stops, saving hours of setup time.
On a packaging line, the adjustable stroke allows quick changeover between different box sizes. An operator can shorten the stroke end to handle a smaller carton and revert it just as easily for the next production run.
In a clamping fixture, the screw can be advanced to take up mechanical wear on a pivot or linkage, maintaining consistent clamping force over thousands of cycles without replacing the cylinder or shimming the mount.
This 80 mm bore SCJ is a sweet spot for applications needing over 2500 N of force at typical shop air pressure, where a 63 mm bore (1559 N push) would be undersized. If your load requires the higher 3927 N push of a 100 mm bore, stepping up is straightforward, but the SCJ80 offers a lighter, more compact package. For applications where the stroke never needs adjustment, the fixed-stroke SC80X250 is a simpler, more cost-effective alternative.
This model is a direct replacement for any AirTAC SCJ80X250-50 cylinder with PT ports and a basic mount. For a 250 mm stroke, always assess the potential for side loading on the 25 mm rod. If the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
The theoretical push force is 2513 N at 0.5 MPa and 4523 N at the maximum operating pressure of 0.9 MPa. The pull force is lower due to the 25 mm rod area, producing 2268 N at 0.5 MPa. The adjusting screw does not alter the cylinder's force output.
It will fit the same mounting footprint, but the SCJ body is slightly longer to house the adjusting mechanism. You can replace an SC80 with this SCJ80X250-50 only if you need the 50 mm adjustable stroke feature and have space for the longer body. The port, rod, and force specifications are identical.
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