The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-50SH 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.
This SCJ50X250-50SH is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a nominal 250 mm stroke, delivering 982 N of push force at 0.5 MPa. Its defining feature is the rear-cap adjusting screw, which provides a 50 mm field-adjustable range to fine-tune the stroke end position without removing the cylinder from the machine. The 20 mm diameter piston rod and PT1/4 ports are standard for this bore class.
Built for demanding environments, the 'H' suffix specifies a Viton (FKM) rod and piston seal, extending the operating temperature range to 0–150 °C. The integrated magnet, designated by the 'S' in the model code, allows for direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors on the barrel for precise, non-contact end-of-stroke position sensing. The body length for this SCJ configuration is 194 mm plus the stroke.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-50SH |
|---|---|
| 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.
In heated packaging or thermoforming machinery, the 50 mm adjustable stroke lets operators quickly fine-tune the end-stop for different product sizes without tools, while the Viton seals handle the sustained heat.
The built-in magnet enables easy addition of CMSG sensors to confirm clamp position. The 50 mm adjust range is ideal for accommodating varying workpiece thicknesses in automated welding or assembly fixtures.
For high-cycle pressing or stamping operations, the rear adjusting screw can be turned to take up mechanical slack as tooling wears down, maintaining a consistent 250 mm nominal stroke end point and extending maintenance intervals.
Choose the SCJ50X250-50SH when you need to precisely dial in a stroke end position on a machine, such as during commissioning or for format changeovers, with the added benefit of high-temperature resilience. If your application requires more force, stepping up to the 63 mm bore provides 1559 N of push force at the same 0.5 MPa pressure. For a simpler, fixed-stroke application without the need for adjustment, the standard SC50X250 cylinder is the direct alternative. This model is a direct replacement for any AirTAC SCJ50X250-50SH cylinder with a magnet, Viton seals, and PT ports. For strokes of 250 mm, ensure the rod is aligned with the load to prevent side-loading and bending; if misalignment is unavoidable, an external guide rail is recommended.
Adjustable-stroke checklist
At 0.5 MPa operating pressure, the push force is 982 N and the pull force is 825 N. The push force is greater because the single rod reduces the effective piston area on the return stroke. The maximum theoretical force at 1.0 MPa is 200 kgf.
A rear-cap screw mechanically limits the piston's outward stroke end within a 0-50 mm range from the 250 mm nominal maximum. It is a direct dimensional replacement for another SCJ50X250-50SH. It can replace a fixed-stroke SC50X250 if you need field adjustability, but you must account for the slightly longer SCJ body length.
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