The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X450-50STC 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. Ø50mm bore, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X450-50STC puts 1767 N of push force at 0.9 MPa into a 50 mm bore single-rod body, with a rear adjusting screw that lets you shorten the stroke end by up to 50 mm without removing the cylinder. Its 20 mm piston rod and 21 mm air cushion work together to handle mid-range automation moves where the final stop position must be dialled in precisely during commissioning or format changeover.
This model ships with a built-in magnet for CMSG/DMSG/EMSG sensors and a TC centre trunnion mount (F-SC50TC bracket included) that lets the cylinder pivot, absorbing misalignment in swinging-arm applications. The 450 mm nominal stroke stays within the 1200 mm maximum for bore 50, so it is a standard-length assembly.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X450-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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, 21 mm |
| Max stroke | Up to 1200 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | Bore size in mm. |
| ×450 | 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 adjust screw lets technicians dial in the exact stroke end on a new packaging machine without swapping cylinders or machining external stops, speeding up line start-up.
When a carton erector switches between box sizes, the operator can quickly reset the cylinder's end position by up to 50 mm, avoiding mechanical rework on the guide rails.
On a clamping station, the screw compensates for jaw pad wear over time, maintaining consistent clamp force without reprogramming the PLC or replacing the actuator.
Choose this 50 mm bore when the 40 mm SCJ (628 N push at 0.5 MPa) is too light but the 63 mm (1559 N push at 0.5 MPa) would oversize the machine. The 50 mm adjustable range is ideal for processes that need a half-centimetre tweak zone at the stroke end. If the stroke never needs field adjustment, a fixed-stroke SC50X450 with the same magnet and trunnion mount is a simpler alternative.
For a 450 mm stroke, check that the rod is not exposed to high side loads; if the load is guided externally or the cylinder pivots on its trunnion, the SCJ50X450-50STC works well. A direct replacement must match the 50 mm bore, 450 mm nominal stroke, 50 mm adjust range, PT port thread, TC mount, and built-in magnet.
Adjustable-stroke checklist
At 0.5 MPa it delivers 982 N pushing and 825 N pulling. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The pull force is lower because the 20 mm rod reduces the piston area on the return stroke.
Yes, if the original is an SCJ with a 50 mm bore, 450 mm nominal stroke, 50 mm adjust range, PT ports, TC trunnion mount, and a magnet. The F-SC50TC bracket is included. This is not a dimensional match for ISO 15552 cylinders.
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