The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X225-50STC 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. Ø63mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X225-50STC is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a nominal 225 mm stroke, featuring a rear-cap adjusting screw that provides a 50 mm adjustable range for fine-tuning the stroke end position on the machine. With a 20 mm piston rod, PT1/4 ports, and a 28 mm air cushion, this cylinder delivers a push force of 1559 N at 0.5 MPa and up to 2805 N at the maximum operating pressure of 0.9 MPa, making it a robust choice for mid-range industrial tasks.
This model is configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, a centre trunnion (TC) mount with the TCM1 bracket for pivoting applications, and the standard TPU seal with PT threads. The tie-rod construction and adjustable stroke make it ideal for commissioning trials or format changeovers where the stop position must be dialled in without swapping the cylinder or adding external hard stops.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X225-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 225 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. |
| ×225 | 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 adjustment screw allows operators to quickly reset the end position for different product sizes on packaging or filling lines without mechanical rework.
In automated welding or assembly fixtures, the adjustable stroke compensates for electrode or pad wear, maintaining consistent clamping force and position over time.
Engineers can fine-tune the actuator's stop point during machine commissioning to optimize throughput and eliminate hard stops, speeding up the debug phase.
Choose the SCJ63 bore when you need a push force of 1559 N at 0.5 MPa; if your application requires more force, step up to the SCJ80 bore which provides 2513 N at the same pressure, or step down to the SCJ50 for 982 N if space is tighter. The 50 mm adjustment range on this model is particularly useful for taking up mechanical wear or accommodating part tolerance variations over long production runs. For a fixed, non-adjustable stroke, consider the standard SC63 series. With a 225 mm stroke, ensure the rod is adequately supported against side loads; if the load is not guided, use an external guide rail or switch to a guided cylinder to prevent rod bending and premature seal wear. This SCJ63X225-50STC is a direct replacement for any AirTAC SCJ63 adjustable cylinder with the same bore, a 225 mm nominal stroke, a 50 mm adjust range, PT ports, TC mount, and magnet.
Adjustable-stroke checklist
The push force is 1559 N at 0.5 MPa and 2805 N at 0.9 MPa. The pull force is slightly lower due to the single 20 mm rod, providing 1402 N at 0.5 MPa. The 50 mm adjustment screw does not alter the cylinder's force output.
Yes, if you need the 50 mm field-adjustable stroke end. The SCJ63X225-50STC shares the same 63 mm bore, PT1/4 ports, and TC mount as a fixed SC63, but the body length is slightly longer to house the adjusting mechanism. Ensure the longer envelope fits your machine.
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