The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-50N 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. Ø63mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X50-50N is a double-acting, single-rod pneumatic cylinder that puts a field-adjustable stroke end directly into the rear cap. A 50 mm adjusting screw lets you dial back the nominal 50 mm stroke without replacing the cylinder, making it ideal for commissioning trials, format changeovers, and wear take-up. With a 20 mm rod and PT1/4 ports, it delivers 1559 N of push force at 0.5 MPa, rising to 2805 N at the 0.9 MPa maximum operating pressure.
This model is fitted with NBR (nitrile) seals, a cost-effective choice for general industrial air service within the standard -20 to +70 °C temperature band. The tie-rod construction houses a 28 mm air cushion for smooth end-of-stroke deceleration, and the body length A(SCJ) is 197 mm. The stroke-end screw only sets the piston stop position; it does not lock the load or adjust speed.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-50N |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 50 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, 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 | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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. |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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.
During machine bring-up, the 50 mm rear screw lets technicians precisely dial in the actuator end-stop without fabricating shims or moving hard stops, speeding up the debug process.
On packaging or assembly lines that run multiple product sizes, operators can quickly adjust the stroke end to match a new format, reducing downtime between batches.
In clamping or pressing fixtures where tooling surfaces wear over time, the screw can be advanced to take up the gap and maintain consistent contact force without retooling.
Choose the SCJ63 bore when your application needs a push force around 1559 N at standard plant pressure. If that margin is too tight, stepping up to an SCJ80 delivers 2513 N of push at the same 0.5 MPa. For a lighter, more compact solution, the SCJ50 provides 982 N. This SCJ63X50-50N is the correct replacement for any AirTAC SCJ63 with a 50 mm nominal stroke and a 50 mm adjust range, PT ports, and NBR seals. If you do not need to change the stroke on the machine, a fixed-stroke SC63X50 is a simpler alternative. For strokes of 300 mm or more, evaluate side-loading on the 20 mm rod and consider adding an external guide or switching to a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder produces 1559 N of push force and 1402 N of pull force. The maximum push force at the 0.9 MPa operating limit is 2805 N. The pull force is lower because the 20 mm piston rod reduces the effective area on the return stroke.
A screw in the rear cap limits how far the piston can retract, shortening the stroke end by up to the -50 mm range. Pick the SCJ when you need to fine-tune the stroke position on the machine for setup, changeover, or wear take-up. If your stroke length is fixed for the life of the machine, the standard SC series is a more economical choice.
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