The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X300-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø250mm bore, 300mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X300-10S is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw, allowing the stroke end position to be fine-tuned across a 10 mm range without replacing the unit. With a 250 mm bore and 300 mm nominal stroke, it delivers a substantial 24544 N of push force at 0.5 MPa, making it suitable for heavy-duty industrial tasks where precise end-stop calibration is required during setup.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG/DMSG/EMSG sensors for reliable piston position feedback. The cylinder body length A(SCJ) is 409 mm, and it features a 50 mm diameter piston rod with an M42x2 thread. The adjustable air cushion decelerates the 40 mm cushion stroke, ensuring smooth operation at speeds of 30-500 mm/s for this ISO 6430 class bore.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X300-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 10 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 | 24544 N | 23562 N |
| 0.7 MPa | 34361 N | — |
| Max (@1.0 MPa) | 5006 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. |
|---|---|
| 250 | Bore size in mm. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -10 | 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 10 mm adjustment screw lets operators dial in the exact bottom-dead-centre position of a large forming press during die changes, compensating for tooling stack-up tolerances without disassembling the cylinder.
Used to actuate high-torque butterfly valves, the adjustable stroke allows precise setting of the open/closed positions during commissioning, ensuring full seat engagement without over-stroking the valve stem.
Controls a heavy diverter gate in a mining or aggregate chute. The stroke-end screw provides a quick mechanical adjustment to align the gate with different downstream conveyor positions after installation.
Choose the SCJ250X300-10S when you need a high-force actuator with field-adjustable stroke end for commissioning or wear compensation. If 24544 N at 0.5 MPa is insufficient, stepping up is not an option in this series; instead, verify your pressure supply can reach the 0.9 MPa maximum to achieve 44178 N. For a lower force requirement, the SCJ200 bore offers 15708 N push at 0.5 MPa. If the stroke does not need adjustment, a fixed-stroke SC250X300 simplifies the bill of materials. For direct replacement, match the 250 mm bore, 300 mm nominal stroke, 10 mm adjust range, PT port thread, and the -S magnet option.
At a 300 mm stroke, consider the potential for side-loading and rod bending. If the load is not perfectly guided, an external guide rail or a switch to a guided cylinder platform is recommended to protect the rod bearings and seals from premature wear.
Adjustable-stroke checklist
The push force is 24544 N at 0.5 MPa and 44178 N at the maximum operating pressure of 0.9 MPa. The pull force is slightly lower at 23562 N at 0.5 MPa due to the 50 mm piston rod reducing the effective piston area on the retract stroke.
No. The SCJ250X300-10S is not designed for position holding. If air pressure is lost or the directional valve is centered, the piston will drift or drop under load. The rear adjusting screw only sets the stroke end position and does not act as a mechanical lock. A pilot-operated check valve or external rod brake is required for load holding.
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