The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X500-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø250mm bore, 500mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X500-20 is a large-bore double-acting single-rod cylinder with a field-adjustable stroke end, delivering 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 20 mm of stroke-end fine-tuning without removing the cylinder, making it ideal for heavy-duty commissioning and format changeovers on large-scale industrial machinery.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter rod and PT1" ports, with a 40 mm adjustable air cushion to decelerate high-inertia loads. The body length A(SCJ) is 409 mm, and the maximum standard stroke for this bore is 1500 mm. At the maximum operating pressure of 0.9 MPa, it generates 44178 N of push force.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X500-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 20 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. |
| ×500 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Fine-tune the retract end position of a large clamping or forming press by up to 20 mm during commissioning or after tooling changes, ensuring precise part contact without reprogramming the press controller.
Adjust the stroke end of a diverter gate cylinder in a mining or aggregate chute to control material flow split. The 20 mm screw adjustment allows operators to compensate for gate wear or change the split ratio on-site.
Set the precise retract stop for a log carriage cylinder. The adjustable stroke allows mill operators to quickly recalibrate the home position for different log diameters, maximizing cutting accuracy and throughput.
Choose the SCJ250 when you need over 24000 N of push force at standard shop air and the ability to fine-tune the stroke end by up to 20 mm on the machine. If your force requirement is lower, stepping down to the 200 mm bore reduces push force to 15708 N at 0.5 MPa, saving space and air consumption. For a fixed stroke without adjustment, the standard SC250 is a direct alternative.
At a 500 mm stroke, the 50 mm rod is robust, but always assess side-loading. For applications with significant off-axis forces, an external guide rail or a guided cylinder is recommended to prevent rod bending and premature seal wear. A direct replacement must match the 250 mm bore, 500 mm nominal stroke, 20 mm adjust range, PT1" ports, basic mounting, and the SCJ tie-rod body style.
Adjustable-stroke checklist
At 0.5 MPa, it generates 24544 N pushing and 23562 N pulling. The maximum push force at the 0.9 MPa operating limit is 44178 N. The pull force is lower because the 50 mm rod reduces the effective piston area on the return stroke.
No, the SCJ250X500-20 is a standard double-acting cylinder and will not hold its position if air pressure is lost or the valve is centered. The air cushion only decelerates the piston at stroke end, and the adjusting screw only sets the stroke limit. To hold a heavy load safely without live pressure, you must add an external mechanical lock, rod brake, or pilot-operated check valve.
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