The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X25-20S 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 SCJ63X25-20S is a 63 mm bore double-acting single-rod pneumatic cylinder with a field-adjustable stroke end, offering a 20 mm adjustment range via the rear-cap screw. At 0.5 MPa it delivers 1559 N push and 1402 N pull, using a 20 mm diameter piston rod and PT1/4 ports.
This model includes a built-in magnet (suffix -S), allowing CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for non-contact position sensing. The adjustable cushion and 28 mm cushion length provide smooth deceleration, making it a practical choice for commissioning and fine-tuning end positions.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X25-20S |
|---|---|
| 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 retract stroke end by up to 20 mm during machine commissioning without swapping the cylinder or machining external hard stops.
Adjust the stroke end to compensate for tooling or gripper wear over time, maintaining precise positioning in clamping and pressing fixtures.
Quickly adapt the cylinder stroke for different product sizes on a packaging or sorting line by turning the rear adjusting screw.
Choose the SCJ63X25-20S when you need to dial in a precise 25 mm nominal stroke with up to 20 mm of field adjustment. If 1559 N push is insufficient, step up to the 80 mm bore (2513 N push at 0.5 MPa); if the force is excessive, the 50 mm bore (982 N push) may suit lighter loads. For a fixed-stroke application without the need for adjustment, the standard SC63 cylinder is a simpler alternative.
A direct replacement must match the 63 mm bore, 25 mm nominal stroke, -20 adjust range, PT port thread, basic mounting, and the magnet option. If the cylinder drives a side-loaded load, consider adding an external guide rail or switching to a guided cylinder to protect the rod and bearings.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The pull force is lower because the rod reduces the effective piston area on the return stroke. Maximum operating pressure is 1.0 MPa.
Only if you need the adjustable stroke feature. The SCJ body length is slightly longer than the fixed-stroke SC due to the adjusting screw mechanism. Ensure the 20 mm adjustment range and the built-in magnet are compatible with your mounting space and control system.
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