The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X275-50S 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X275-50S is a double-acting, single-rod pneumatic cylinder engineered for field-adjustable stroke end positioning. Its rear-cap adjusting screw provides a 50 mm fine-tuning range, allowing you to dial in the exact stroke end without removing the cylinder or adding external hard stops. With a 63 mm bore, it delivers 1559 N of push force at 0.5 MPa, making it a robust choice for medium-duty automation tasks.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for precise end-of-stroke or mid-stroke position feedback. The 20 mm diameter piston rod and PT1/4 ports ensure reliable fluid flow, while the 28 mm air cushion at each end decelerates the piston smoothly, protecting the end caps during high-cycle operation. The body length A(SCJ) is 197 mm, providing a compact footprint for its 275 mm nominal stroke.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X275-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 275 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. |
| ×275 | 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 rear screw adjustment allows technicians to quickly fine-tune the stroke end position during machine commissioning, eliminating the need to swap cylinders or fabricate custom shims for precise end-stop calibration.
In packaging or assembly lines handling multiple product sizes, the adjustable stroke lets operators rapidly reset the actuator's throw for a new format, significantly reducing downtime between production runs.
For clamping or pressing operations, the stroke can be incrementally extended over the cylinder's service life to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force without mechanical rework.
Choose the SCJ63 bore when your application requires push force in the 1559 N range at standard plant pressure. If you need more force, stepping up to the SCJ80 bore provides 2513 N of push at 0.5 MPa. For applications needing less force, the SCJ50 bore delivers 982 N. This SCJ adjustable-stroke model is ideal for commissioning and format changeovers; if your stroke length is permanently fixed, a standard SC fixed-stroke cylinder is a more economical choice. For a direct replacement, match the 63 mm bore, 275 mm nominal stroke, 50 mm adjust range, PT port thread, and the -S magnet option. At this 275 mm stroke length, ensure the rod is adequately supported if significant side loads are present, or consider an external guide rail to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 3118 N. Because this is a single-rod cylinder, the push force is always greater than the pull force due to the rod area on the piston.
Yes, if you need the 50 mm adjustable stroke feature. The SCJ shares the same bore, rod diameter, and mounting accessories as the SC series. For a direct replacement, ensure your new model matches the 63 mm bore, PT ports, and add the -S magnet option if you use magnetic sensors. The body length is slightly longer to accommodate the adjusting screw mechanism.
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