The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X20-20 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, 20mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X20-20 is an 80 mm bore double-acting, single-rod cylinder with a field-adjustable stroke end. Its rear-cap screw provides up to 20 mm of adjustment, allowing the effective stroke to be fine-tuned from the nominal 20 mm down to a hard stop without changing the cylinder body. This model delivers 2513 N of push force at 0.5 MPa, driven by a 25 mm diameter piston rod, and is built on a tie-rod body with a length of 239 mm.
Equipped with a PT3/8 port and standard TPU seals, it operates reliably from -20 to +70 °C with a speed range of 30-800 mm/s. The adjustable pneumatic cushion decelerates the piston at the end of travel, but the screw itself is a mechanical stroke-end limiter, not a force or speed controller. For position sensing, a magnet can be added by ordering the -S suffix variant.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X20-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 20 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. |
| ×20 | 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.
Fine-tune the end stop during initial machine setup without swapping cylinders. The 20 mm adjustment range lets technicians dial in the exact stroke for sensor alignment or part contact, speeding up factory acceptance tests.
Quickly adapt a stopper or diverter on a packaging line for different box sizes. The rear screw adjusts the cylinder's extended position, providing a mechanical end-stop change in seconds without reprogramming servo axes.
In clamping or pressing operations, the adjustable stroke can take up slack from worn tooling or workpiece variation. The 2513 N push force at 0.5 MPa provides ample power for medium-duty assembly fixtures.
Choose the SCJ80 when your application needs the 2513 N push force of an 80 mm bore at standard plant pressure. If your force requirement is lower, stepping down to a 63 mm bore (1559 N push at 0.5 MPa) reduces air consumption and physical size. For higher forces, the 100 mm bore provides 3927 N push. This adjustable-stroke model is the right choice when the final stroke length must be dialed in on the machine during commissioning or changeover, rather than using a fixed-stroke SC cylinder. For guided loads, consider a dedicated guided cylinder to protect the rod from side forces.
As a direct replacement, match the 80 mm bore, 20 mm nominal stroke, and 20 mm adjust range (-20), along with the PT3/8 port. The basic mounting configuration accepts the SCJ-specific FA, LB, or TC mounting kits. Note that the standard flange (FB) and clevis (CA/CB) mounts from the SC series are not compatible with this tie-rod body.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N. The pull force is lower because the 25 mm rod reduces the effective piston area on the return stroke.
Only if the adjustable stroke feature is needed and the mounting is compatible. The SCJ80 body is slightly longer than an SC80 to house the adjusting screw. You must match the 80 mm bore, the 20 mm nominal stroke, the 20 mm adjust range, and the PT3/8 port. The SCJ series does not support FB flange or CA/CB clevis mounts, so your existing mounting brackets must be from the FA, LB, or TC range.
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