The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X240-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø80mm bore, 240mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X240-40 is an 80 mm bore double-acting single-rod cylinder with a rear adjusting screw that provides up to 40 mm of field-adjustable stroke-end control. Operating on filtered air at 0.15–1.0 MPa, it delivers 2513 N of push force and 2268 N of pull force at 0.5 MPa, making it a capable mid-range actuator for tasks that need precise mechanical stop tuning without swapping the cylinder.
This model has a 25 mm diameter piston rod, PT3/8 ports, and an M20x1.5 rod thread for secure tooling attachment. The adjustable air cushion decelerates the piston over the final 28 mm of travel, and the body length A(SCJ) is 239 mm. The tie-rod construction keeps it serviceable, and the TPU seals suit standard -20 to +70 °C operation.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X240-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 240 mm |
| Stroke adjustment | Up to 40 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. |
| -40 | 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.
The 40 mm adjust range lets technicians dial in the exact stroke end during machine commissioning without cutting brackets or adding external hard stops, speeding up line start-up.
On packaging or sorting lines, operators can quickly re-set the cylinder stroke for a new box size or product width by turning the rear screw, minimizing downtime between batches.
In clamping or pressing fixtures, the adjustable stroke can be extended slightly over time to compensate for pad wear or tooling compression, maintaining consistent clamp force without replacing parts.
Step up to a 100 mm bore SCJ if your application needs more than the 4523 N push force this 80 mm unit provides at 0.9 MPa; the 100 mm bore delivers 5497 N at 0.7 MPa. If your stroke never needs field adjustment, a fixed-stroke SC80X240 cylinder is a simpler, slightly shorter alternative. For a direct replacement, match an AirTAC SCJ80X240-40 with PT ports, basic mounting, and no magnet.
At a 240 mm stroke, rod deflection under side load is a real concern. If your tooling applies any lateral force, add an external linear guide or switch to a guided cylinder to protect the rod bearing and piston seals from premature wear.
Adjustable-stroke checklist
At 0.5 MPa, it produces 2513 N pushing and 2268 N pulling. At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N. The push force is higher because the single rod reduces the piston area on the pull side.
Yes, this is a direct dimensional and performance match for any AirTAC SCJ80 cylinder with a 240 mm nominal stroke and a 40 mm adjustable range. Ensure your port thread is PT and mounting style is basic. For units with a magnet or different mounts, order the corresponding suffix code.
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