The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X225-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø50mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X225-75S is a 50 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw lets you shorten the effective stroke by up to 75 mm from the 225 mm nominal maximum, enabling fine-tuning during commissioning or format changes without swapping the cylinder. At 0.5 MPa, it delivers 982 N push and 825 N pull, with a 20 mm rod and PT1/4 ports.
This model includes a built-in magnet (-S suffix), so you can directly clamp CMSG/DMSG/EMSG reed or solid-state sensors onto the tie-rod barrel for reliable end-of-stroke detection. The body length A(SCJ) is 194 mm, and the adjustable air cushion decelerates the piston smoothly over the final 21 mm. It is a genuine AirTAC tie-rod cylinder, purpose-built for applications where the stroke length must be dialed in on the machine.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X225-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 75 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. |
| -75 | 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.
Dial in the exact stopping position for a new machine axis. The 75 mm adjustment range on the 225 mm stroke lets technicians fine-tune the end point without cutting brackets or adding shims.
Quickly adjust a pusher or stopper cylinder for different product sizes on a packaging line. The rear screw allows operators to change the stroke end in seconds, minimizing downtime between batches.
Compensate for mechanical wear in a clamping or pressing fixture over time. The adjustable stroke end can be extended slightly to maintain consistent contact force as tooling surfaces degrade.
Choose the SCJ50 when the force from a 40 mm bore (628 N push at 0.5 MPa) is insufficient, but the larger 63 mm bore (1559 N push) would be oversized. The 75 mm adjustment range is ideal for applications needing a wide tuning window. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. To replace this unit, match the 50 mm bore, 225 mm nominal stroke, 75 mm adjust range (-75), PT port thread, and the magnetic piston (-S).
With a 225 mm stroke, be mindful of side loading on the 20 mm rod. If the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The maximum push force at the 0.9 MPa operating limit is 1767 N. Because it is a single-rod cylinder, the pull force is always lower due to the area of the 20 mm rod.
A screw in the rear cap sets the mechanical end position of the piston stroke, allowing you to shorten it by up to 75 mm. It is not a locking or holding brake. If air pressure is lost, the piston will not hold its position. For load holding without pressure, you need an external rod lock or a pilot-operated check valve.
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