The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X50-20S 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, 50mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X50-20S is a double-acting, single-rod tie-rod cylinder with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end control. With an 80 mm bore, it delivers 2513 N of push force at 0.5 MPa, making it a strong choice for medium-duty positioning tasks where the final stop point needs fine-tuning during commissioning or format changes.
This model includes a built-in magnet (suffix -S), allowing CMSG/DMSG/EMSG solid-state and reed sensors to clamp directly onto the barrel for reliable end-of-stroke detection. The 25 mm diameter piston rod, PT3/8 ports, and 28 mm air cushion at each end ensure smooth deceleration, while the adjustable screw shortens the stroke end without altering the cylinder’s 50 mm nominal rating or its 4523 N maximum push force at 0.9 MPa.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X50-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 50 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. |
| ×50 | 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 stroke end position during machine bring-up without removing the cylinder. The 20 mm adjustment range lets technicians quickly compensate for assembly tolerances and achieve precise actuator placement.
Adjust the cylinder stroke to accommodate different product sizes on a packaging or sorting line. Operators can change the stop position in seconds, reducing downtime between batches.
Take up mechanical play or wear in tooling over time by slightly extending the effective stroke. The rear screw provides a simple, maintenance-friendly way to restore accurate end positioning without replacing parts.
Choose the SCJ80 bore when your application needs roughly 2500 N of push force at standard plant air pressure. If you require more force, stepping up to the 100 mm bore provides 3927 N at 0.5 MPa; for a lighter, more compact solution, the 63 mm bore delivers 1559 N. This SCJ adjustable-stroke design is the right pick when you need to dial in the exact stroke end position on the machine, rather than swapping to a fixed-stroke SC cylinder. A direct replacement must match the 80 mm bore, 50 mm nominal stroke, 20 mm adjust range, PT port thread, and the -S magnet option. The SCJ series uses a subset of SC mounting accessories: basic, FA front flange, LB foot, or TC centre trunnion with TCM1 bracket.
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. Because this is a single-rod cylinder, the push force is always greater than the pull force due to the rod area.
A rear-cap screw lets you shorten the stroke end by up to 20 mm without changing the cylinder. Pick the SCJ when you need to fine-tune the stop position on the machine, such as during commissioning or for different product formats. Choose a fixed-stroke SC cylinder if your application has a single, unchanging stroke length and you want a simpler, lower-cost solution.
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