The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X25-20 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, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X25-20 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides 20 mm of field-adjustable stroke-end control, letting you fine-tune the 25 mm nominal stroke without swapping the unit. Its 63 mm bore delivers 1559 N of push force at 0.5 MPa and up to 2805 N at 0.9 MPa, making it a capable actuator for precise positioning tasks.
Built on the proven AirTAC tie-rod platform, this model features a 20 mm diameter piston rod, PT1/4 ports, and a 28 mm air cushion for smooth deceleration. The body length A dimension is 197 mm, and the adjustable screw only affects the stroke end position, not the cylinder's force output or speed rating of 30-800 mm/s.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X25-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 25 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. |
| ×25 | 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.
Fine-tune the retracted or extended position of a tooling plate by up to 20 mm during initial machine setup, eliminating the need for physical shims.
Adjust the opening stroke of a small diverter gate on a conveyor line to match different product heights without changing the cylinder.
Compensate for workpiece thickness variations in a clamping station by fine-tuning the clamp arm's final position via the rear screw.
Choose the SCJ63X25-20 when you need to dial in a short stroke end position during commissioning or format changes. If you require more force, step up to the 80 mm bore which provides 2513 N of push at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC63X25 is the direct alternative. This model is a drop-in replacement for any AirTAC SCJ63 cylinder with a 25 mm nominal stroke, 20 mm adjust range, PT1/4 ports, and basic mounting.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N due to the 20 mm rod reducing the piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 3118 N.
A screw in the rear cap lets you shorten the stroke end position by up to 20 mm. The nominal 25 mm stroke is the maximum; turning the screw moves the piston's stop point inward, which is ideal for fine-tuning without dismounting the cylinder.
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