The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-50S 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, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ63X120-50S is a 63 mm bore, double-acting single-rod pneumatic cylinder with a field-adjustable stroke. A rear-cap adjusting screw lets you shorten the stroke end by up to 50 mm without removing the cylinder, making it ideal for commissioning and fine-tuning end positions on the fly. This model includes a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors, and at 0.5 MPa it delivers 1559 N of push force and 1402 N of pull force.
The SCJ63 series features a 20 mm diameter piston rod with M16x1.5 male threads, PT1/4 ports, and a 28 mm air cushion for smooth deceleration. Its tie-rod construction gives a body length of 197 mm, and the operating range spans 0.15–1.0 MPa with a speed of 30–800 mm/s. The adjustable screw only sets the stroke end position; it does not alter the cylinder's force output or act as a load-holding device.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 120 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. |
| ×120 | 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 range allows technicians to precisely tune the end-of-stroke position during machine commissioning without swapping cylinders or machining external hard stops.
The built-in magnet works with CMSG/DMSG sensors to provide end-of-stroke confirmation to a PLC, making this cylinder perfect for automated sorting gates or diverters where position feedback is critical.
In clamping or pressing fixtures, the adjustable stroke can be gradually extended over time to compensate for tooling wear or material compression, maintaining consistent clamp force without mechanical rework.
Choose the SCJ63X120-50S when your application needs a mid-range bore with sensor feedback and the ability to dial in the stroke end during setup. If 1559 N of push force at 0.5 MPa is insufficient, stepping up to an 80 mm bore provides 2513 N; if it is more than you need, a 50 mm bore delivers 982 N. For fixed-stroke applications, consider the standard SC63 series to eliminate the adjusting mechanism.
This cylinder is a direct replacement for another AirTAC SCJ63 with a 120 mm nominal stroke, 50 mm adjust range, PT ports, basic mounting, and magnet. The 120 mm stroke is well within the 1500 mm maximum for this bore, but for any stroke over 300 mm, evaluate side-loading on the rod and consider adding an external guide or switching to a guided cylinder to prevent bending.
Adjustable-stroke checklist
A rear-cap adjusting screw limits the piston's retraction, effectively shortening the stroke end by up to 50 mm. The nominal 120 mm stroke is the maximum; you can field-set any shorter stroke within that 50 mm window. The screw adjusts position only—it does not control speed or force.
No. Like all standard double-acting pneumatic cylinders, the SCJ63X120-50S will drift or drop if air pressure is exhausted or the directional valve is centered. The air cushion only decelerates the piston at end-of-stroke. To hold a load without live pressure, you must add a pilot-operated check valve or an external mechanical rod lock.
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