The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø63mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X120-100 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke family, featuring a rear-cap adjusting screw that provides a full 100 mm of field-configurable stroke reduction. With a 63 mm bore, it delivers a substantial 1559 N of push force and 1402 N of pull force at 0.5 MPa, making it a powerful solution for applications where the end position must be precisely tuned without swapping the cylinder.
This model has a nominal 120 mm stroke, a 20 mm diameter piston rod with M16x1.5 threads, and a 28 mm air cushion for smooth deceleration. The PT1/4 ports and standard TPU seals handle operating pressures from 0.15 to 1.0 MPa. The body length A(SCJ) is 197 mm, and the screw allows the effective stroke to be shortened down to 20 mm to accommodate commissioning adjustments, wear compensation, or format changeovers.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 100 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. |
| -100 | 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 100 mm adjustment range allows engineers to fine-tune the cylinder's end-stop during initial machine setup and process optimization, eliminating the need to stock multiple fixed-stroke cylinders for trial runs.
In high-cycle clamping fixtures, the adjustable screw can be periodically advanced to compensate for wear on tooling or workpieces, maintaining consistent clamp force without reprogramming or mechanical shimming.
For packaging or assembly lines handling different product sizes, operators can quickly adjust the stroke end to accommodate a new format, drastically reducing changeover time compared to replacing the cylinder.
Choose the SCJ63X120-100 when you need a robust, mid-bore cylinder whose end-of-stroke position must be dialed in on the machine. Its 1559 N push force at 0.5 MPa suits medium-duty pressing, clamping, and positioning tasks. If you require more force, stepping up to the 80 mm bore provides 2513 N of push force; for a lighter, more compact design, the 50 mm bore delivers 982 N.
This adjustable-stroke model is ideal when the application's exact stroke length is uncertain during design or needs to change over time. If your stroke is fixed and never varies, a standard SC63 fixed-stroke cylinder is a more economical choice. For direct replacement, match the 63 mm bore, 120 mm nominal stroke, 100 mm adjust range, PT port thread, and basic mounting. This SCJ does not include a magnet; if you need piston position sensing, select the -S suffix variant.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder provides 1559 N of push force (using the full bore area) and 1402 N of pull force (subtracting the 20 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 3118 N.
A rear-cap screw mechanically limits the piston's retraction stroke end within a 100 mm range, letting you set the effective stroke from 20 mm up to the nominal 120 mm. This is a mechanical end-stop, not a locking device; the piston will drift if air pressure is lost. For position holding without pressure, an external rod lock or pilot-operated check valve is required.
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