The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X300-50S 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X300-50S is a double-acting, single-rod pneumatic cylinder that puts field-adjustable stroke control directly into the rear cap. Its -50 adjusting screw lets you shorten the stroke end by up to 50 mm without removing the cylinder, making it ideal for commissioning trials and format changeovers where the exact stop position needs to be dialled in on the machine. With a 20 mm rod and PT1/4 ports, it delivers a robust 1559 N of push force at 0.5 MPa.
This model includes a built-in magnet, allowing CMSG, DMSG, or EMSG sensors to clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The 300 mm nominal stroke is well within the 1500 mm maximum for the 63 bore, and the adjustable air cushion helps decelerate the piston smoothly over the final 28 mm of travel. The body length A is 197 mm, providing a compact envelope for its force class.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X300-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
Fine-tune the actuator end-stop during initial machine build-out, allowing engineers to compensate for stack-up tolerances without swapping cylinders or machining custom spacers.
Quickly adjust the push stroke for different box or pallet sizes on a packaging line. The 50 mm range handles multiple SKUs with a simple screw adjustment.
Take up mechanical play in clamping or pressing fixtures over time. The adjustable stroke screw restores precise contact without replacing the entire actuator.
Choose the SCJ63 bore when your application needs roughly 1560 N of push force at standard plant air pressure. If you need more force, stepping up to the 80 mm bore provides 2513 N of push at 0.5 MPa; for a lighter, more compact solution, the 50 mm bore delivers 982 N. This adjustable-stroke model is the right pick over a fixed-stroke SC when the end position must be fine-tuned during setup or changed between product runs. For a direct replacement, match the 63 mm bore, 300 mm nominal stroke, 50 mm adjust range, PT port thread, basic mounting, and the -S magnet option. At a 300 mm stroke, ensure the rod is supported against side loads—consider an external guide rail or a guided cylinder if lateral forces are present.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder produces 1559 N of push force and 1402 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 318 kgf.
A rear-cap screw sets the stroke end position within a 50 mm range, shortening the nominal 300 mm stroke. It replaces a fixed-stroke SC of the same bore when you need field adjustability, but you must match the bore, port thread, and magnet option for a drop-in fit.
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