The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X300-20 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, 300mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X300-20 is a double-acting, single-rod pneumatic cylinder delivering substantial force for heavy industrial tasks, with a push force of 24544 N at 0.5 MPa. Its defining feature is the rear-cap adjusting screw, which provides up to 20 mm of stroke-end reduction, allowing operators to fine-tune the piston's stopping point in the field without dismounting the unit.
Built on a robust tie-rod construction with a 50 mm diameter piston rod and a 40 mm air cushion, this ISO 6430 class cylinder handles a maximum operating pressure of 1.0 MPa. The body length A(SCJ) is 409 mm, and the PT1" port supplies the necessary flow for its 300 mm nominal stroke, making it a precise workhorse for format changes or wear compensation.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X300-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 300 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. |
| ×300 | 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-tunes the final advance of a large forming or stamping press, using the 20 mm screw adjustment to dial in the exact material compression point during setup.
Controls a diverter gate on a conveyor for aggregates or grain, where the adjustable stroke compensates for gate seal wear and maintains a consistent flow path.
Simplifies the commissioning of heavy welding or assembly jigs, allowing engineers to micro-adjust the 300 mm clamping stroke to accommodate fixture tolerances without re-machining stops.
Choose the SCJ250 bore when your application demands the high force of 24544 N push at 0.5 MPa, a significant step up from the 15708 N offered by the SCJ200. If your stroke does not require field adjustment, the fixed-stroke SC250X300 is a simpler alternative. For a direct replacement, match the 250 mm bore, 300 mm nominal stroke, 20 mm adjust range, PT port thread, and basic mounting.
Given the 300 mm stroke, be mindful of side-loading on the 50 mm rod. If the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod deflection and premature seal wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N due to the single-rod design. The maximum push force at 0.9 MPa is 44178 N.
A screw in the rear cap physically limits the piston's retraction, shortening the stroke end by up to 20 mm. It sets a new mechanical stop, not a speed or force control, allowing you to reduce the 300 mm nominal stroke without changing the cylinder.
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