The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X225-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø50mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X225-40 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering a nominal maximum stroke of 225 mm and a 40 mm rear-screw adjustment range. In this 50 mm bore class, it generates 982 N of push force and 825 N of pull force at 0.5 MPa, driven by a 20 mm diameter piston rod and controlled through PT1/4 ports. The integrated air cushion (21 mm) provides smooth end-of-travel deceleration.
This adjustable-stroke design allows machine builders and maintenance teams to fine-tune the cylinder's end position on the fly without swapping the unit or adding external hard stops. The SCJ body length A is 194 mm, making it slightly longer than a fixed-stroke SC of the same bore. It operates on 40 µm filtered air from 0.15 to 1.0 MPa and is rated for speeds of 30-800 mm/s, with a standard TPU seal suitable for -20 to +70 °C.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X225-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 40 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. |
| ×225 | Nominal (maximum) stroke length in mm. |
| -40 | 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 40 mm rear adjustment screw lets technicians dial in the exact stroke end position during initial machine setup, compensating for tolerance stack-ups without needing to re-machine mounting brackets or swap cylinders.
On packaging or assembly lines that handle multiple product sizes, the adjustable stroke allows a quick mechanical change of the actuator's end stop, reducing changeover time between production runs.
In clamping or pressing operations, the stroke can be incrementally extended over time to compensate for tooling or pad wear, maintaining consistent contact force without replacing the entire cylinder.
Choose the SCJ50X225-40 when you need to commission or re-task a station with a stroke that may need up to 40 mm of end-position adjustment. If your application requires more push force, stepping up to the 63 mm bore provides 1559 N at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. This model is a direct dimensional replacement for another AirTAC SCJ50 cylinder with the same nominal stroke, 40 mm adjust range, PT ports, and basic mounting.
At a 225 mm stroke, side-loading on the 20 mm rod should be assessed. If the load is not guided externally, consider adding a guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 50 mm bore cylinder provides 982 N of push force on extension and 825 N of pull force on retraction. The push force is higher because the single rod reduces the effective piston area on the pull side. The maximum operating pressure is 1.0 MPa, yielding a theoretical push force of 1767 N.
A rear-cap adjusting screw physically limits the piston's stroke end by up to 40 mm, allowing you to shorten the 225 mm nominal stroke in the field. Choose the SCJ when you need to fine-tune the end position during commissioning, for format changes, or to compensate for wear. If your stroke length is fixed and will never need adjustment, the standard SC series is a more cost-effective choice.
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