The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø50mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X250-50S is a double-acting, single-rod pneumatic cylinder that puts stroke-end tuning directly in your hands. Its rear-cap adjusting screw provides a 50 mm adjustment range, allowing you to fine-tune the 250 mm nominal stroke on the machine without swapping the cylinder. At 0.5 MPa, it delivers 982 N of push force and 825 N on the pull stroke, driven through a 20 mm diameter piston rod.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG solid-state sensors clamp directly onto the tie-rod barrel for reliable, non-contact position sensing. The body length A is 194 mm, and the cylinder uses a PT1/4 port with an M16x1.5 rod thread. It operates with filtered air from 0.15 to 1.0 MPa and features an adjustable air cushion for smooth deceleration.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 50 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. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -50 | 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 50 mm adjustment range lets technicians dial in the exact stroke end position during initial machine setup, compensating for assembly tolerances without needing to order a custom-stroke cylinder.
On a packaging line, quickly adjust the stroke end to accommodate a new box size or product height. The 50 mm range handles multiple formats with a single cylinder model, reducing changeover time.
In a clamping or pressing operation, the adjustable screw can be advanced to take up for tooling wear or material compression over time, maintaining consistent clamp force without reprogramming a stop position.
Choose the SCJ50X250-50S when you need a mid-range force actuator with field-adjustable stroke for commissioning or format changes. If 982 N of push force at 0.5 MPa is insufficient, stepping up to the 63 mm bore provides 1559 N of push force. For applications where the stroke is fixed and never needs adjustment, the standard SC50X250 is a simpler, more cost-effective alternative. This SCJ model is a direct replacement for any AirTAC SCJ50 cylinder with a 250 mm nominal stroke, a 50 mm adjust range, PT1/4 ports, a basic mount, and a magnet. With a 250 mm stroke, ensure the load is guided to prevent side-loading and rod bending; for unsupported loads, add an external guide rail or switch to a guided cylinder.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this cylinder produces 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. The force is identical to a fixed-stroke SC50 cylinder; the adjustment screw only changes the stroke end position, not the output force.
Yes, if you need an adjustable stroke. It is a direct dimensional replacement for an AirTAC SCJ50 with a 250 mm nominal stroke and 50 mm adjust range. Ensure your mounting style matches (this is a basic mount) and that you have PT1/4 ports. The built-in magnet allows you to add position sensors if needed.
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