The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X225-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø80mm bore, 225mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X225-20S is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that lets you fine-tune the stroke end position by up to 20 mm in the field. With an 80 mm bore and a 25 mm piston rod, it delivers 2513 N of push force and 2268 N of pull force at 0.5 MPa, making it a robust choice for medium-duty positioning tasks where the final stop point needs to be dialed in precisely.
This model includes a built-in magnet (-S suffix), so you can mount CMSG/DMSG/EMSG reed or solid-state sensors directly onto the tie-rod barrel for end-of-stroke detection. The body length (A dimension) is 239 mm, and the standard PT3/8 ports keep it compatible with common pneumatic fittings. The adjustable air cushion helps decelerate the piston smoothly, even when the stroke end is shortened by the screw.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X225-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 20 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. |
| ×225 | Nominal (maximum) stroke length in mm. |
| -20 | 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 20 mm adjustment range allows technicians to perfectly match the cylinder's end stop to the tooling without shimming or moving hard stops, cutting setup time significantly.
On packaging lines, use the rear screw to quickly adjust the stroke for a new box size. The 2513 N push force handles the insertion or forming task, while the magnet confirms the new position is reached.
In clamping or pressing fixtures, the adjustable stroke end can be tweaked over time to compensate for pad wear or material thickness variations, maintaining consistent clamping force without replacing the cylinder.
Choose the SCJ80 when your application needs around 2513 N of push force at standard shop air. If you need more force, stepping up to the 100 mm bore SCJ100 provides 3927 N push at the same pressure. For applications that don't require field adjustment of the stroke, the fixed-stroke SC80 cylinder is a simpler, more cost-effective alternative. When replacing an existing unit, match the 80 mm bore, 225 mm nominal stroke, 20 mm adjust range, PT3/8 ports, and the built-in magnet. For strokes of this length, be mindful of side loads on the 25 mm rod; if the load is not guided, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, it produces 2513 N of push force and 2268 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 5026 N.
You can, but you will lose the field-adjustable stroke feature. The SCJ80X225-20S has a rear adjusting screw that lets you shorten the stroke end by up to 20 mm. A fixed-stroke SC80 cylinder would need external hard stops to achieve the same tunability. Ensure any replacement matches the 80 mm bore, PT3/8 ports, and the -S magnet option if you use sensors.
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