The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X300-20 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X300-20 is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a 300 mm nominal stroke, featuring a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. This allows fine-tuning of the piston stop position without removing the cylinder, delivering 1559 N of push force and 1402 N of pull force at 0.5 MPa. The 20 mm rod is threaded M16x1.5, and the integrated air cushion provides 28 mm of deceleration.
Built on the rugged AirTAC tie-rod platform, this unit has a body length A of 197 mm and uses PT1/4 ports. The adjustable stroke is ideal for commissioning trials, format changeovers, and wear take-up on clamping or positioning stations. Its force class suits medium-duty pressing, bending, and material handling tasks where the end position must be dialled in precisely on the machine.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X300-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
Dial in the exact retract position during machine setup. The 20 mm adjustment range on the 300 mm stroke lets technicians fine-tune the stop for sensor alignment or part contact without swapping cylinders.
Quickly adapt a pusher or diverter station for different product sizes. The rear screw adjusts the stroke end to match new box or pallet dimensions, reducing changeover time on packaging lines.
In clamping or pressing fixtures, use the adjustable stroke to take up mechanical wear on tooling or seals over time. The 1559 N push force at 0.5 MPa provides consistent clamping pressure as the stop is re-adjusted.
Choose the SCJ63X300-20 when you need to adjust the stroke end by up to 20 mm on a 300 mm stroke. If your force requirement is lower, the 50 mm bore SCJ50X300-20 offers 982 N push at 0.5 MPa; for higher force, step up to the 80 mm bore providing 2513 N push. This model is the correct replacement for an existing AirTAC SCJ63X300-20 with PT ports and basic mounting. For a fixed stroke with no adjustment, use the SC63X300; if the application requires a guided, non-rotating rod, consider a guided cylinder instead.
At a 300 mm stroke, be mindful of side loading. Ensure the load is guided externally or use a rod-end joint to prevent bending moment on the 20 mm rod. The adjustable screw sets the stroke end only—it is not a force or speed control.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The pull force is lower due to the single 20 mm rod reducing the piston area on the return stroke.
A screw in the rear cap limits how far the piston retracts, shortening the stroke end by up to 20 mm from the nominal 300 mm. You turn the screw to set the desired stop position. It adjusts the mechanical end point only and does not change the cylinder's force or speed.
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