The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X175-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø50mm bore, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X175-75 brings field-adjustable stroke control to the 50 mm bore class, delivering 982 N of push force at 0.5 MPa (up to 1767 N at 0.9 MPa). Its rear-cap adjusting screw provides up to 75 mm of stroke-end reduction, letting you dial in the exact stopping position for commissioning trials or format changeovers without removing the cylinder from the machine.
Built on the proven SC tie-rod platform, this single-rod double-acting cylinder uses a 20 mm piston rod and PT1/4 ports. The 21 mm air cushion decelerates the piston smoothly, while the 194 mm body length (A dimension) keeps the envelope compact for its 175 mm nominal stroke. Standard TPU seals handle -20 to +70 °C with filtered air at 0.15-1.0 MPa.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X175-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 75 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. |
| ×175 | Nominal (maximum) stroke length in mm. |
| -75 | 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.
During machine bring-up, the 75 mm adjustment range lets technicians iteratively dial in the exact stroke end position without swapping cylinders or machining external hard stops, cutting setup time significantly.
On packaging or assembly lines running multiple product sizes, operators can quickly reset the cylinder's end stop to match a new box height or part dimension, reducing changeover downtime to minutes.
In clamping or pressing fixtures where tooling or pads wear over time, the rear screw allows periodic stroke-end adjustment to maintain consistent contact force and position without disassembling the actuator.
Step up to the 63 mm bore (1559 N push at 0.5 MPa) if your load exceeds the SCJ50's 982 N capability, or down to the 40 mm bore (628 N) when space and force requirements are lower. The SCJ is the right choice when you need to fine-tune the stroke end on the fly — if your application uses a fixed, unchanging stroke, the standard SC series offers a simpler, lower-cost alternative. For this model, a direct replacement must match the 50 mm bore, 175 mm nominal stroke, 75 mm adjust range, PT ports, basic mounting, and no magnet. At 175 mm stroke, rod deflection is minimal, but for off-axis loads consider an external guide rail or a guided cylinder.
Adjustable-stroke checklist
At 0.5 MPa, this cylinder produces 982 N pushing and 825 N pulling. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The theoretical force at 1.0 MPa is 200 kgf. The push force is higher than pull because the single rod reduces the piston area on the return side.
Physically, the SCJ50X175-75 has the same bore, port size, and rod dimensions, but its body is slightly longer to house the rear adjusting mechanism. It will fit if you have clearance for the extra length. Functionally, you gain the ability to shorten the stroke by up to 75 mm. Ensure your mounting and magnet options match — this basic version has no magnet and PT threads.
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