The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X25-20S 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. Ø50mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X25-20S is a 50 mm bore, single-rod double-acting cylinder with a rear adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. At 0.5 MPa, it delivers 982 N of push force and 825 N on the pull stroke, making it a capable actuator for mid-range pneumatic tasks.
This model includes a built-in magnet, allowing easy attachment of CMSG, DMSG, or EMSG sensors directly to the tie-rod barrel for precise end-of-stroke detection. The body length is 194 mm, and it uses a 20 mm diameter piston rod with an M16x1.5 male thread for tooling attachment.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X25-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 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, 21 mm |
| Max stroke | Up to 1200 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | 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 end position during machine commissioning without swapping cylinders or machining hard stops, saving setup time on new equipment builds.
Quickly adjust the stroke end for different product sizes on a packaging or assembly line, enabling rapid changeover between batches.
The built-in magnet allows direct mounting of reed or solid-state sensors for reliable, non-contact end-of-stroke feedback in automated sequences.
For applications needing slightly more force, stepping up to the 63 mm bore SCJ provides 1559 N of push force at the same pressure. If the stroke must remain fixed and non-adjustable, the standard SC series is a direct alternative. This SCJ model is a drop-in replacement for any AirTAC SCJ50 with a 25 mm nominal stroke and 20 mm adjust range, using PT ports and basic mounting. The integrated magnet simplifies sensor installation for cycle counting or sequencing.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it generates 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N.
A screw in the rear cap allows you to shorten the stroke end by up to 20 mm. This sets the piston's stop position without affecting the cylinder's bore size or force output.
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