The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-50 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, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ63X120-50 is a double-acting, single-rod tie-rod cylinder that delivers 1559 N of push force at 0.5 MPa, making it a robust choice for medium-duty automation tasks. Its defining feature is a rear-cap adjusting screw that provides a 50 mm field-adjustable stroke-end range, allowing operators to fine-tune the piston's end position from 70 mm up to the full 120 mm nominal stroke without dismounting the cylinder or adding external hard stops.
This 63 mm bore unit uses a 20 mm diameter piston rod, PT1/4 ports, and an M16x1.5 rod thread, with a 28 mm air cushion length to decelerate the load smoothly. The body length A(SCJ) is 197 mm, and it operates reliably on 40 µm filtered air within a 0.15-1.0 MPa pressure range and -20 to +70 °C temperature window.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-50 |
|---|---|
| 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 adjustable stroke lets technicians dial in the exact end-stop position during machine commissioning, eliminating the need to fabricate custom shims or swap out cylinders for minor stroke corrections.
On packaging lines that handle multiple product sizes, the rear screw allows a quick stroke adjustment to accommodate different box heights or pallet dimensions without replacing the actuator, reducing downtime between batches.
In clamping or pressing fixtures, the adjustable stroke end can be periodically tweaked to compensate for tooling wear or material thickness variations, maintaining consistent contact force and part quality over long production runs.
Choose the SCJ63X120-50 when your application requires a 120 mm maximum stroke with the flexibility to reduce it by up to 50 mm during commissioning or changeovers. If you need more force, stepping up to the 80 mm bore provides 2513 N of push force at the same 0.5 MPa pressure; for a lighter, more compact solution, the 50 mm bore offers 982 N. This adjustable-stroke model is ideal when the exact stroke length is unknown at design time, whereas a fixed-stroke SC63X120 is a simpler, more cost-effective choice if the stroke is permanently fixed.
For a direct replacement, match an AirTAC SCJ cylinder with a 63 mm bore, 120 mm nominal stroke, a -50 adjust range, and PT port threads. This model is configured with a basic mount; if you need a pivoting motion, specify the TC centre trunnion with the TCM1 bracket. For strokes of 300 mm or more, evaluate side-loading and rod bending—consider adding an external guide rail or switching to a guided cylinder assembly to protect the rod bearing.
Adjustable-stroke checklist
At 0.5 MPa, this single-rod cylinder generates 1559 N of push force and 1402 N of pull force. The push force is higher because the full bore area is pressurized, while pull force is reduced by the 20 mm rod area. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N.
You can, provided the 50 mm adjustable range is acceptable and you match the port thread (PT) and mounting style. The SCJ body is slightly longer than a fixed-stroke SC to house the adjusting screw. Ensure the physical envelope fits your machine and that you do not need a flange (FB) or clevis (CA/CB) mount, as these are not available for the SCJ series.
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