The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X225-20STC 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, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X225-20STC is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the 225mm nominal stroke by up to 20mm without replacing the unit. With a 63mm bore and 20mm rod, it delivers 1559N of push force at 0.5MPa, making it a robust choice for medium-duty automation where precise end-position control is needed during commissioning or changeovers.
This model comes factory-equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion pivot (TC) supplied with the TCM1 bracket for swinging loads. The body length A is 197mm, and the adjustable air cushion decelerates the piston smoothly at each stroke end. Operating on filtered air from 0.15 to 1.0MPa, it uses a PT1/4 port and an M16x1.5 rod thread.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X225-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 225 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. |
| ×225 | 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.
The 20mm rear adjusting screw allows operators to precisely dial in the retract stroke end position on a pick-and-place unit, compensating for minor tooling variations without stopping production.
Ideal for a pivoting diverter gate on a conveyor line. The trunnion mount handles the swinging motion while the adjustable stroke quickly adapts the gate's throw to different package sizes.
In a clamping or pressing fixture, the stroke can be incrementally adjusted to take up mechanical wear on contact pads, maintaining consistent clamping force and cycle times over the tool's life.
Choose the SCJ63X225-20STC when you need to dial in a stroke end position on a pivoting assembly. If 1559N of push force at 0.5MPa is insufficient, stepping up to an 80mm bore provides 2513N; if it is more than needed, a 50mm bore delivers 982N. For a fixed, non-adjustable stroke on the same mounting, the standard SC series is a simpler alternative.
This cylinder is a direct replacement for another AirTAC SCJ63X225-20STC with a PT port, centre trunnion mount, and magnet. At a 225mm stroke, ensure the rod is not subjected to high side loads; if lateral forces are present, couple it with an external linear guide or switch to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard 0.5MPa operating pressure, this 63mm bore cylinder generates 1559N of push force and 1402N of pull force. The maximum push force at the 1.0MPa limit is 2805N. The adjustable stroke screw does not alter the cylinder's force output.
A rear-cap screw sets the piston's retract end position, shortening the 225mm nominal stroke by up to 20mm. This SCJ63X225-20STC is a direct drop-in replacement for any AirTAC SCJ cylinder of the same bore, nominal stroke, 20mm adjust range, PT port, TC trunnion mount, and magnet sensor option.
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