The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X55-50S 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, 55mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X55-50S delivers a push force of 1559 N at 0.5 MPa and up to 2805 N at 0.9 MPa, driven by a 20 mm piston rod. Its defining feature is a rear-cap adjusting screw that provides a 50 mm stroke-end adjustment range, letting you dial in the exact retract position without swapping the cylinder.
This single-rod, double-acting tie-rod cylinder uses PT1/4 ports and includes a built-in magnet, so CMSG, DMSG, or EMSG sensors clamp directly onto the barrel for reliable end-of-stroke detection. The adjustable air cushion decelerates the piston smoothly, and the body length A(SCJ) is 197 mm.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X55-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 55 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. |
| ×55 | 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 setup, the 50 mm adjusting screw allows engineers to precisely set the retract end position for a 63 mm bore actuator without changing hard stops or cylinder mounts, speeding up the commissioning process.
On packaging lines, the adjustable stroke enables operators to quickly adapt the cylinder's end position for different box sizes or product formats, minimizing downtime between production runs.
In clamping or pressing applications, the stroke can be incrementally shortened over time to compensate for tooling wear or material thickness variations, maintaining consistent process quality.
Choose the SCJ63X55-50S when you need to fine-tune the stroke end by up to 50 mm during commissioning or format changes. If 1559 N of push force at 0.5 MPa is insufficient, step up to the 80 mm bore, which provides 2513 N. For a fixed, non-adjustable stroke, the standard SC63 cylinder is a simpler alternative. This model is a direct replacement for another AirTAC SCJ63 adjustable-stroke cylinder with the same 55 mm nominal stroke, 50 mm adjust range, PT ports, and built-in magnet. For strokes of 300 mm or more, evaluate side-loading on the 20 mm rod and consider an external guide or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
The push force is 1559 N at 0.5 MPa and 2805 N at 0.9 MPa. The pull force is 1402 N at 0.5 MPa, as the 20 mm rod reduces the effective piston area on the retract stroke. This is a single-rod cylinder, so push force is always greater than pull force.
A rear-cap screw mechanically limits the piston's retract stroke end within a 50 mm range. Pick the SCJ when your application requires field-adjustable end positions for tuning, changeovers, or wear take-up. Choose a fixed-stroke SC if the stroke length is permanently fixed and you do not need this adjustment feature.
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