The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-50 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 SCJ63X50-50 is a double-acting, single-rod pneumatic cylinder that puts field-adjustable stroke control directly onto the machine. Its rear-cap adjusting screw gives you a full 50 mm of stroke-end adjustment, so the effective stroke can be dialed from zero up to the nominal 50 mm without swapping the cylinder or adding external hard stops. This makes it a practical tool for commissioning trials, format changeovers, and taking up mechanical wear over time.
With a 63 mm bore and a 20 mm piston rod, this unit delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa. The body length A is 197 mm, and it features a 28 mm air cushion for smooth deceleration. The adjustable screw only sets the stroke end position—it does not alter the cylinder's force output or speed capability, which remains 30-800 mm/s.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-50 |
|---|---|
| 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 commissioning, the 50 mm adjustment range lets technicians dial in the exact stroke end position for a new tooling setup without machining custom stops or swapping cylinders.
On packaging or assembly lines running multiple product sizes, the rear screw allows operators to quickly reset the cylinder stroke for a different box height or part length, minimizing downtime between batches.
In clamping or pressing applications where tooling surfaces wear down over time, the adjustable stroke end can be periodically advanced to maintain consistent contact pressure without replacing the actuator.
Choose the SCJ63 when you need the force of a 63 mm bore but must fine-tune the stroke end on the machine. If your load requires less force, stepping down to a 40 mm bore (628 N push at 0.5 MPa) saves air and space; if you need more, the 80 mm bore delivers 2513 N push. A fixed-stroke SC63 is the better pick when the stroke never changes, as it eliminates the adjusting mechanism. For a direct replacement, match the 63 mm bore, 50 mm nominal stroke, 50 mm adjust range, PT port thread, and basic mounting. If you later need position sensing, order the SCJ63X50-50S with a built-in magnet for CMSG/DMSG sensors.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 63 mm bore cylinder generates 1559 N of push force and 1402 N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 3118 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area on the return side.
Yes, provided you match the 63 mm bore, PT port thread, and basic mounting style. The SCJ body is slightly longer than the equivalent SC to house the adjusting screw, so check the 197 mm body length A for clearance. The adjustable stroke adds field-tuning capability that the fixed SC does not have, but the force output and cushion performance are identical.
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