The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X400-50SH 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, 400mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X400-50SH is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke. A rear-cap adjusting screw lets you shorten the stroke end by up to 50 mm without removing the cylinder, making it ideal for commissioning fine-tuning and format changeovers. This model includes a built-in magnet for sensor mounting and high-temperature Viton seals, extending the operating range to 0–150 °C.
With a 25 mm diameter rod and PT3/8 ports, it delivers a push force of 2513 N at 0.5 MPa and up to 4523 N at the maximum operating pressure of 0.9 MPa. The pull force is slightly lower at 2268 N at 0.5 MPa due to the single-rod design. The body length A(SCJ) is 239 mm, and the cylinder features an adjustable air cushion for smooth deceleration.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X400-50SH |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 400 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. |
| ×400 | 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.
The 50 mm adjustment screw allows process engineers to dial in the exact stroke end position during machine setup and commissioning trials without swapping out the cylinder.
With Viton seals rated for 0–150 °C, this cylinder is suited for pusher or diverter stations on conveyors moving hot products through ovens or curing lines.
In high-cycle clamping fixtures, the adjustable stroke can compensate for wear on tooling or contact surfaces over time, maintaining consistent clamping force without mechanical shims.
Choose the SCJ80X400-50SH when you need a robust 80 mm bore cylinder with the ability to fine-tune the stroke end position on the machine. If your force requirement is lower, stepping down to a 63 mm bore (1559 N push at 0.5 MPa) can save space and air consumption. For a fixed, non-adjustable stroke, the standard SC series is a more economical choice. This model is a direct replacement for another AirTAC SCJ adjustable-stroke cylinder with an 80 mm bore, 400 mm nominal stroke, and a 50 mm adjustment range, matching the PT port thread, basic mounting, magnet, and Viton seal configuration. For a 400 mm stroke, ensure the rod is not subjected to high side loads; consider an external guide rail or a guided cylinder if lateral forces are present.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. The maximum push force at the 0.9 MPa operating limit is 4523 N. The theoretical force at 1.0 MPa is 513 kgf.
No. Like all standard double-acting cylinders, the SCJ80X400-50SH will not hold its position if air pressure is lost or the valve is centered. The piston will drift. For load holding without live pressure, you must add an external rod lock or a pilot-operated check valve.
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