The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-20SH 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X50-20SH is a double-acting, single-rod pneumatic cylinder engineered for fine-tuning the stroke end position in the field. Its rear-cap adjusting screw provides a 20 mm adjustable range, allowing you to dial in the exact stopping point without swapping the cylinder. This model is configured with high-temperature Viton (FKM) seals, extending the operating temperature range to 0–150 °C, and a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors.
With a 63 mm bore and a 20 mm rod, it delivers a substantial 1559 N of push force at 0.5 MPa. The cylinder features a 28 mm air cushion for smooth deceleration and a PT1/4 port. Its body length A(SCJ) is 197 mm, making it a compact yet powerful solution for applications where the final stroke length needs to be precisely matched to the machine during commissioning or after maintenance.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-20SH |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 50 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. |
| ×50 | 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.
During machine setup, the 20 mm adjustment screw allows engineers to perfectly synchronize the cylinder's end stop with other actuators on the line, eliminating the need for shims or custom external hard stops.
The Viton seals enable reliable operation in hot environments up to 150 °C, such as moving parts near ovens or autoclaves, where the adjustable stroke can compensate for thermal expansion of tooling.
In clamping fixtures, the adjustable stroke can be periodically shortened to take up wear on the clamp pads or the workpiece, maintaining consistent clamping force without replacing the cylinder.
Select the SCJ63X50-20SH when you need to fine-tune the stroke end by up to 20 mm on a 63 mm bore platform. If your force requirements are lower, stepping down to a 50 mm bore (SCJ50, 982 N push at 0.5 MPa) can reduce size and cost. For a fixed, non-adjustable stroke, the standard SC63 cylinder is a simpler alternative. This SCJ model is a direct replacement for another AirTAC SCJ63 cylinder with a 50 mm nominal stroke, a 20 mm adjust range, PT ports, a basic mount, a magnet, and Viton seals.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The maximum push force at 0.9 MPa is 2805 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the rod area on the piston.
No, the SCJ63X50-20SH is not a load-holding device. The air cushion only decelerates the piston at the stroke end, and the adjustment screw only sets the stroke end position. If the load must be held in place without air pressure, you will need an external mechanical lock, a rod brake, or a pilot-operated check valve in the circuit.
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