The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X500-20 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, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X500-20 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw gives you up to 20 mm of field-adjustable stroke reduction, so commissioning teams can dial in the exact stop position for a 500 mm nominal stroke without re-plumbing or adding external hard stops.
Built on the 63 mm bore tie-rod platform, this unit delivers 1559 N of push force at 0.5 MPa and reaches 2805 N at 0.9 MPa. The 20 mm diameter piston rod and 28 mm air cushion at each end handle deceleration smoothly. With a body length A of 197 mm and a PT1/4 port, it fits into existing SCJ layouts directly.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X500-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 500 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. |
| ×500 | 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.
On packaging or filling lines, use the 20 mm rear screw to shift the stroke end for different box heights or container sizes. Operators adjust one cylinder in seconds instead of swapping mechanical stops.
In woodworking or welding fixtures, the adjustable stroke compensates for pad wear or varying workpiece thickness. Dial the screw to maintain consistent clamping force as consumables bed in.
Fine-tune the open position of a material-handling diverter gate. The 1559 N push force at 0.5 MPa moves medium-weight parcels, while the 20 mm adjustment range lets you align the gate perfectly with different chute widths.
Choose this 63 mm bore when your application needs the mid-range push of 1559 N at standard plant air. If you require more force, step up to the 80 mm bore which provides 2513 N push at 0.5 MPa; for a lighter, more compact solution the 50 mm bore offers 982 N. Because this is a 500 mm stroke unit, watch for side-loading on the extended rod—consider an external guide rail or switch to a guided cylinder if the load is not perfectly axial.
For replacement, match an AirTAC SCJ63X500-20 with PT thread, basic mounting, and no magnet. If your current unit has a centre trunnion, order the SCJ63X500-20TC which includes the TCM1 bracket. A fixed-stroke SC cylinder is the better pick only when the end position is permanently fixed and never needs adjustment.
Adjustable-stroke checklist
Push force is 1559 N at 0.5 MPa and 2805 N at 0.9 MPa. Pull force on the return stroke is lower because the 20 mm rod reduces the effective piston area, giving 1402 N at 0.5 MPa. Always size for the weaker pull stroke if the cylinder works against a load in both directions.
Yes, the mounting footprint and port positions are identical. The SCJ body is slightly longer to house the rear adjusting mechanism. Ensure you have clearance for the screw housing at the rear cap. The adjustable stroke is a bonus—you can lock it at the full 500 mm or dial it back by up to 20 mm as needed.
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