The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X300-50STC 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, 300mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X300-50STC is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, giving you a 50 mm range to fine-tune the stroke end without swapping the unit. At 0.5 MPa, it delivers 2513 N of push force and 2268 N on the pull stroke, driven through a 25 mm diameter piston rod and PT3/8 ports.
This model is configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG sensors and a centre trunnion (TC) mount that ships with the TCM1 bracket, allowing the cylinder to pivot freely. The body length A(SCJ) is 239 mm, and it includes a 28 mm air cushion for smooth deceleration. As a genuine AirTAC component, it provides consistent, repeatable performance for dynamic industrial tasks.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X300-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 300 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. |
| ×300 | 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 rear adjustment screw lets technicians dial in the exact stop position on a new assembly line without depressurizing the system or machining custom end-stops.
Quickly adapt the stroke end for different product sizes on a packaging machine. The trunnion mount allows the cylinder body to pivot, accommodating the changing geometry of a sorting gate.
In high-cycle clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamp force without replacing parts.
Choose this 80 mm bore SCJ when you need a mid-range force actuator with the flexibility to adjust the end position by up to 50 mm during commissioning or changeovers. If your load requires more force, step up to the 100 mm bore which provides 3927 N of push at 0.5 MPa; for a lighter, more compact solution, the 63 mm bore offers 1559 N. For applications needing a fixed, non-adjustable stroke, the standard SC series is a more economical choice.
At a 300 mm stroke, be mindful of side-loading on the rod. If the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear. This SCJ is a direct replacement for another SCJ80 with a 300 mm nominal stroke, 50 mm adjust range, PT ports, centre trunnion mount, and magnet sensor capability.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it generates 2513 N of pushing force and 2268 N of pulling force. The maximum push force at 0.9 MPa is 4523 N. The rear adjusting screw changes only the stroke end position and does not alter the cylinder's output force.
It can replace another AirTAC SCJ adjustable-stroke cylinder with an 80 mm bore, 300 mm nominal stroke, and 50 mm adjustment range. It is not a direct dimensional drop-in for a fixed-stroke SC cylinder, as the SCJ body is longer to house the adjustment mechanism. Ensure your mounting setup accommodates the centre trunnion and the 239 mm body length.
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