The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø63mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X120-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering a nominal 120mm stroke that can be shortened by up to 20mm via the rear adjusting screw. This 63mm bore unit delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa, making it a robust mid-range actuator for tasks requiring fine end-position tuning during commissioning or changeovers.
Equipped with a built-in magnet (-S suffix), this model directly accepts CMSG/DMSG/EMSG reed or solid-state sensors for reliable end-of-stroke detection without external brackets. It features a 20mm piston rod, PT1/4 ports, and a 28mm air cushion for smooth deceleration. The tie-rod construction ensures serviceability, and the body length A(SCJ) is 197 mm.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 20 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. |
| -20 | 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.
Fine-tune the retract or extend end position by up to 20mm on the machine without swapping cylinders, speeding up initial system setup and debugging.
Quickly adjust a stop gate or diverter stroke for different product sizes on a packaging or assembly line, minimizing downtime between batches.
The 20mm adjustment range allows operators to take up mechanical play or compensate for tooling wear over time, maintaining precise positioning without replacing parts.
Choose the SCJ63 when you need the 1559 N push force at 0.5 MPa. If your application requires more force, step up to the 80mm bore SCJ80 which provides 2513 N of push force. For applications where the stroke never needs adjustment, the fixed-stroke SC63 is a simpler, more cost-effective alternative. This SCJ63X120-20S is a direct replacement for any AirTAC SCJ63 cylinder with a 120mm nominal stroke, a 20mm adjust range, PT ports, basic mounting, and a magnet sensor option.
For this 120mm stroke, side-loading is generally not a primary concern at typical operating pressures, but always ensure the load is guided and aligned axially with the rod to maximize seal life. If significant side forces are unavoidable, consider an external guide rail.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder provides 1559 N of push force and 1402 N of pull force. The maximum push force at the 0.9 MPa operating limit is 2805 N.
A rear-cap screw allows you to shorten the stroke end by up to 20mm from the nominal 120mm maximum. It is a direct form-and-function replacement for any AirTAC SCJ63 cylinder with a 120mm stroke, 20mm adjust range, PT ports, basic mounting, and a magnet.
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