The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X240-50S 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, 240mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X240-50S delivers a nominal 240 mm stroke with a 50 mm rear adjusting screw, letting you dial in the exact stroke end on the fly. It generates 2513 N of push force at 0.5 MPa (4523 N at 0.9 MPa) and uses a 25 mm rod with PT3/8 ports, making it a robust choice for mid-range pneumatic positioning.
A built-in magnet is factory-installed, so CMSG/DMSG/EMSG sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The 28 mm air cushion decelerates the piston smoothly, and the adjustable screw shortens the stroke end by up to 50 mm without swapping the cylinder.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X240-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 240 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. |
| ×240 | 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 setup, the 50 mm rear screw allows engineers to precisely set the end position for a pick-and-place arm without re-plumbing or changing the cylinder.
On a packaging line, the adjustable stroke lets operators quickly adapt a pusher's travel to different box widths, minimizing downtime between batches.
In a clamping station, the screw can be advanced to take up mechanical wear on tooling, maintaining consistent clamp force without replacing the actuator.
Step up to an SCJ100 for 3927 N push at 0.5 MPa if the 80 mm bore's 2513 N is marginal, or drop to an SCJ63 (1559 N) when space and force requirements are lower. For applications where the stroke never needs field adjustment, a fixed-stroke SC80 offers a slightly shorter body length. The replacement match is an SCJ80X240-50S with PT ports, basic mount, and the -S magnet.
At 240 mm stroke, rod deflection is generally manageable, but if the load applies a significant side force, add an external linear guide or switch to a guided cylinder to protect the rod bearing.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N (due to the 25 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5026 N.
A rear-cap screw limits the stroke end by up to 50 mm from the nominal 240 mm maximum. Choose the SCJ when you need to fine-tune the stroke on the machine; pick a fixed-stroke SC80 if the stroke is permanently fixed, as it has a slightly more compact body.
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